move 3rd-party librarys into libs/ and add built-in honeysuckle

21 files changed, 8103 insertions, 0 deletions

diff --git a/libs/assimp/port/PyAssimp/3d_viewer_screenshot.png b/libs/assimp/port/PyAssimp/3d_viewer_screenshot.png
new file mode 100644
index 0000000..2031faf
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/3d_viewer_screenshot.png
diff --git a/libs/assimp/port/PyAssimp/README.md b/libs/assimp/port/PyAssimp/README.md
new file mode 100644
index 0000000..c9944f7
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/README.md
@@ -0,0 +1,86 @@
+PyAssimp Readme
+===============
+
+A simple Python wrapper for Assimp using `ctypes` to access the library.
+Requires Python >= 2.6.
+
+Python 3 support is mostly here, but not well tested.
+
+Note that pyassimp is not complete. Many ASSIMP features are missing.
+
+USAGE
+-----
+
+### Complete example: 3D viewer
+
+`pyassimp` comes with a simple 3D viewer that shows how to load and display a 3D
+model using a shader-based OpenGL pipeline.
+
+![Screenshot](3d_viewer_screenshot.png)
+
+To use it, from within `/port/PyAssimp`:
+
+```console
+$ cd scripts
+$ python ./3D-viewer <path to your model>
+```
+
+You can use this code as starting point in your applications.
+
+### Writing your own code
+
+To get started with `pyassimp`, examine the simpler `sample.py` script in `scripts/`,
+which illustrates the basic usage. All Assimp data structures are wrapped using
+`ctypes`. All the data+length fields in Assimp's data structures (such as
+`aiMesh::mNumVertices`, `aiMesh::mVertices`) are replaced by simple python
+lists, so you can call `len()` on them to get their respective size and access
+members using `[]`.
+
+For example, to load a file named `hello.3ds` and print the first
+vertex of the first mesh, you would do (proper error handling
+substituted by assertions ...):
+
+```python
+
+from pyassimp import load
+with load('hello.3ds') as scene:
+
+  assert len(scene.meshes)
+  mesh = scene.meshes[0]
+
+  assert len(mesh.vertices)
+  print(mesh.vertices[0])
+
+```
+
+Another example to list the 'top nodes' in a
+scene:
+
+```python
+
+from pyassimp import load
+with load('hello.3ds') as scene:
+
+  for c in scene.rootnode.children:
+      print(str(c))
+
+```
+
+INSTALL
+-------
+
+Install `pyassimp` by running:
+
+```console
+$ python setup.py install
+```
+
+PyAssimp requires a assimp dynamic library (`DLL` on windows,
+`.so` on linux, `.dynlib` on macOS) in order to work. The default search directories are:
+  - the current directory
+  - on linux additionally: `/usr/lib`, `/usr/local/lib`,
+    `/usr/lib/x86_64-linux-gnu`
+
+To build that library, refer to the Assimp master `INSTALL`
+instructions. To look in more places, edit `./pyassimp/helper.py`.
+There's an `additional_dirs` list waiting for your entries.
diff --git a/libs/assimp/port/PyAssimp/README.rst b/libs/assimp/port/PyAssimp/README.rst
new file mode 100644
index 0000000..03b7968
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/README.rst
@@ -0,0 +1,93 @@
+PyAssimp: Python bindings for libassimp
+=======================================
+
+A simple Python wrapper for Assimp using ``ctypes`` to access the
+library. Requires Python >= 2.6.
+
+Python 3 support is mostly here, but not well tested.
+
+Note that pyassimp is not complete. Many ASSIMP features are missing.
+
+USAGE
+-----
+
+Complete example: 3D viewer
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+``pyassimp`` comes with a simple 3D viewer that shows how to load and
+display a 3D model using a shader-based OpenGL pipeline.
+
+.. figure:: 3d_viewer_screenshot.png
+   :alt: Screenshot
+
+   Screenshot
+
+To use it, from within ``/port/PyAssimp``:
+
+::
+
+    $ cd scripts
+    $ python ./3D-viewer <path to your model>
+
+You can use this code as starting point in your applications.
+
+Writing your own code
+~~~~~~~~~~~~~~~~~~~~~
+
+To get started with ``pyassimp``, examine the simpler ``sample.py``
+script in ``scripts/``, which illustrates the basic usage. All Assimp
+data structures are wrapped using ``ctypes``. All the data+length fields
+in Assimp's data structures (such as ``aiMesh::mNumVertices``,
+``aiMesh::mVertices``) are replaced by simple python lists, so you can
+call ``len()`` on them to get their respective size and access members
+using ``[]``.
+
+For example, to load a file named ``hello.3ds`` and print the first
+vertex of the first mesh, you would do (proper error handling
+substituted by assertions ...):
+
+.. code:: python
+
+
+    from pyassimp import load
+    with load('hello.3ds') as scene:
+
+        assert len(scene.meshes)
+        mesh = scene.meshes[0]
+
+        assert len(mesh.vertices)
+        print(mesh.vertices[0])
+
+
+Another example to list the 'top nodes' in a scene:
+
+.. code:: python
+
+
+    from pyassimp import load
+    with load('hello.3ds') as scene:
+
+        for c in scene.rootnode.children:
+            print(str(c))
+
+
+INSTALL
+-------
+
+Install ``pyassimp`` by running:
+
+::
+
+    $ python setup.py install
+
+PyAssimp requires a assimp dynamic library (``DLL`` on windows, ``.so``
+on linux, ``.dynlib`` on macOS) in order to work. The default search
+directories are:
+
+-  the current directory
+-  on linux additionally: ``/usr/lib``, ``/usr/local/lib``,
+   ``/usr/lib/x86_64-linux-gnu``
+
+To build that library, refer to the Assimp master ``INSTALL``
+instructions. To look in more places, edit ``./pyassimp/helper.py``.
+There's an ``additional_dirs`` list waiting for your entries.
diff --git a/libs/assimp/port/PyAssimp/gen/materialgen.py b/libs/assimp/port/PyAssimp/gen/materialgen.py
new file mode 100644
index 0000000..ef32d8e
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/gen/materialgen.py
@@ -0,0 +1,96 @@
+#!/usr/bin/env python
+# -*- Coding: UTF-8 -*-
+
+# ---------------------------------------------------------------------------
+# Open Asset Import Library (ASSIMP)
+# ---------------------------------------------------------------------------
+#
+# Copyright (c) 2006-2020, ASSIMP Development Team
+#
+# All rights reserved.
+#
+# Redistribution and use of this software in source and binary forms, 
+# with or without modification, are permitted provided that the following 
+# conditions are met:
+# 
+# * Redistributions of source code must retain the above
+#   copyright notice, this list of conditions and the
+#   following disclaimer.
+# 
+# * Redistributions in binary form must reproduce the above
+#   copyright notice, this list of conditions and the
+#   following disclaimer in the documentation and/or other
+#   materials provided with the distribution.
+# 
+# * Neither the name of the ASSIMP team, nor the names of its
+#   contributors may be used to endorse or promote products
+#   derived from this software without specific prior
+#   written permission of the ASSIMP Development Team.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# ---------------------------------------------------------------------------
+
+"""Update PyAssimp's texture type constants C/C++ headers.
+
+This script is meant to be executed in the source tree, directly from
+port/PyAssimp/gen
+"""
+
+import os
+import re
+
+REenumTextureType = re.compile(r''
+                r'enum\saiTextureType'    # enum aiTextureType
+                r'[^{]*?\{'               # {
+                r'(?P<code>.*?)'          #   code 
+                r'\};'                    # };
+                , re.IGNORECASE + re.DOTALL + re.MULTILINE)
+
+# Replace comments
+RErpcom = re.compile(r''
+                r'\s*(/\*+\s|\*+/|\B\*\s?|///?!?)'   # /**
+                r'(?P<line>.*?)'                     #  * line 
+                , re.IGNORECASE + re.DOTALL)
+
+# Remove trailing commas
+RErmtrailcom = re.compile(r',$', re.IGNORECASE + re.DOTALL)
+
+# Remove #ifdef __cplusplus   
+RErmifdef = re.compile(r''
+                r'#ifndef SWIG'                       # #ifndef SWIG
+                r'(?P<code>.*)'                       #   code 
+                r'#endif(\s*//\s*!?\s*SWIG)*'  # #endif
+                , re.IGNORECASE + re.DOTALL)
+
+path = '../../../include/assimp'
+
+files = os.listdir (path)
+enumText = ''
+for fileName in files:
+    if fileName.endswith('.h'):
+      text = open(os.path.join(path, fileName)).read()
+      for enum in REenumTextureType.findall(text):
+        enumText = enum
+
+text = ''
+for line in enumText.split('\n'):
+  line = line.lstrip().rstrip()
+  line = RErmtrailcom.sub('', line)
+  text += RErpcom.sub('# \g<line>', line) + '\n'
+text = RErmifdef.sub('', text)
+
+file = open('material.py', 'w')
+file.write(text)
+file.close()
+
+print("Generation done. You can now review the file 'material.py' and merge it.")
diff --git a/libs/assimp/port/PyAssimp/gen/structsgen.py b/libs/assimp/port/PyAssimp/gen/structsgen.py
new file mode 100644
index 0000000..f34ec19
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/gen/structsgen.py
@@ -0,0 +1,290 @@
+#!/usr/bin/env python
+# -*- Coding: UTF-8 -*-
+
+# ---------------------------------------------------------------------------
+# Open Asset Import Library (ASSIMP)
+# ---------------------------------------------------------------------------
+#
+# Copyright (c) 2006-2020, ASSIMP Development Team
+#
+# All rights reserved.
+#
+# Redistribution and use of this software in source and binary forms, 
+# with or without modification, are permitted provided that the following 
+# conditions are met:
+# 
+# * Redistributions of source code must retain the above
+#   copyright notice, this list of conditions and the
+#   following disclaimer.
+# 
+# * Redistributions in binary form must reproduce the above
+#   copyright notice, this list of conditions and the
+#   following disclaimer in the documentation and/or other
+#   materials provided with the distribution.
+# 
+# * Neither the name of the ASSIMP team, nor the names of its
+#   contributors may be used to endorse or promote products
+#   derived from this software without specific prior
+#   written permission of the ASSIMP Development Team.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# ---------------------------------------------------------------------------
+
+"""Update PyAssimp's data structures to keep up with the
+C/C++ headers.
+
+This script is meant to be executed in the source tree, directly from
+port/PyAssimp/gen
+"""
+
+import os
+import re
+
+#==[regexps]=================================================
+
+# Clean desc 
+REdefine = re.compile(r''
+                r'(?P<desc>)'                                       # /** *desc */
+                r'#\s*define\s(?P<name>[^(\n]+?)\s(?P<code>.+)$'    #  #define name value
+                , re.MULTILINE)
+
+# Get structs
+REstructs = re.compile(r''
+                #r'//\s?[\-]*\s(?P<desc>.*?)\*/\s'           # /** *desc */
+                #r'//\s?[\-]*(?P<desc>.*?)\*/(?:.*?)'            # garbage
+                r'//\s?[\-]*\s(?P<desc>.*?)\*/\W*?'           # /** *desc */
+                r'struct\s(?:ASSIMP_API\s)?(?P<name>[a-z][a-z0-9_]\w+\b)'    # struct name
+                r'[^{]*?\{'                                 # {
+                r'(?P<code>.*?)'                            #   code 
+                r'\}\s*(PACK_STRUCT)?;'                      # };
+                , re.IGNORECASE + re.DOTALL + re.MULTILINE)
+
+# Clean desc 
+REdesc = re.compile(r''
+                r'^\s*?([*]|/\*\*)(?P<line>.*?)'            #  * line 
+                , re.IGNORECASE + re.DOTALL + re.MULTILINE)
+
+# Remove #ifdef __cplusplus   
+RErmifdef = re.compile(r''
+                r'#ifdef __cplusplus'                       # #ifdef __cplusplus
+                r'(?P<code>.*)'                             #   code 
+                r'#endif(\s*//\s*!?\s*__cplusplus)*'          # #endif
+                , re.IGNORECASE + re.DOTALL)
+                
+# Replace comments
+RErpcom = re.compile(r''
+                r'\s*(/\*+\s|\*+/|\B\*\s|///?!?)'             # /**
+                r'(?P<line>.*?)'                            #  * line 
+                , re.IGNORECASE + re.DOTALL)
+                
+# Restructure 
+def GetType(type, prefix='c_'):
+    t = type
+    while t.endswith('*'):
+        t = t[:-1]
+    if t[:5] == 'const':
+        t = t[5:]
+
+    # skip some types
+    if t in skiplist:
+           return None
+
+    t = t.strip()
+    types = {'unsigned int':'uint', 'unsigned char':'ubyte',}
+    if t in types:
+        t = types[t]
+    t = prefix + t
+    while type.endswith('*'):
+        t = "POINTER(" + t + ")"
+        type = type[:-1]
+    return t
+    
+def restructure( match ):
+    type = match.group("type")
+    if match.group("struct") == "":
+        type = GetType(type)
+    elif match.group("struct") == "C_ENUM ":
+        type = "c_uint"
+    else:
+        type = GetType(type[2:], '')
+        if type is None:
+           return ''
+    if match.group("index"):
+        type = type + "*" + match.group("index")
+        
+    result = ""
+    for name in match.group("name").split(','):
+        result += "(\"" + name.strip() + "\", "+ type + "),"
+    
+    return result
+
+RErestruc = re.compile(r''
+                r'(?P<struct>C_STRUCT\s|C_ENUM\s|)'                     #  [C_STRUCT]
+                r'(?P<type>\w+\s?\w+?[*]*)\s'                           #  type
+                #r'(?P<name>\w+)'                                       #  name
+                r'(?P<name>\w+|[a-z0-9_, ]+)'                               #  name
+                r'(:?\[(?P<index>\w+)\])?;'                             #  []; (optional)
+                , re.DOTALL)
+#==[template]================================================
+template = """
+class $NAME$(Structure):
+    \"\"\"
+$DESCRIPTION$
+    \"\"\" 
+$DEFINES$
+    _fields_ = [
+            $FIELDS$
+        ]
+"""
+
+templateSR = """
+class $NAME$(Structure):
+    \"\"\"
+$DESCRIPTION$
+    \"\"\" 
+$DEFINES$
+
+$NAME$._fields_ = [
+            $FIELDS$
+        ]
+"""
+
+skiplist = ("FileIO", "File", "locateFromAssimpHeap",'LogStream','MeshAnim','AnimMesh')
+
+#============================================================
+def Structify(fileName):
+    file = open(fileName, 'r')
+    text = file.read()
+    result = []
+    
+    # Get defines.
+    defs = REdefine.findall(text)
+    # Create defines
+    defines = "\n"
+    for define in defs:
+        # Clean desc 
+        desc = REdesc.sub('', define[0])
+        # Replace comments
+        desc = RErpcom.sub('#\g<line>', desc)
+        defines += desc
+	if len(define[2].strip()):
+            # skip non-integral defines, we can support them right now
+            try:
+                int(define[2],0)
+            except:
+                continue
+            defines += " "*4 + define[1] + " = " + define[2] + "\n"  
+            
+    
+    # Get structs
+    rs = REstructs.finditer(text)
+
+    fileName = os.path.basename(fileName)
+    print fileName
+    for r in rs:
+        name = r.group('name')[2:]
+        desc = r.group('desc')
+        
+        # Skip some structs
+        if name in skiplist:
+            continue
+
+        text = r.group('code')
+
+        # Clean desc 
+        desc = REdesc.sub('', desc)
+        
+        desc = "See '"+ fileName +"' for details." #TODO  
+        
+        # Remove #ifdef __cplusplus
+        text = RErmifdef.sub('', text)
+        
+        # Whether the struct contains more than just POD
+        primitive = text.find('C_STRUCT') == -1
+
+        # Restructure
+        text = RErestruc.sub(restructure, text)
+        # Replace comments
+        text = RErpcom.sub('# \g<line>', text)
+        text = text.replace("),#", "),\n#")
+        text = text.replace("#", "\n#")
+        text = "".join([l for l in text.splitlines(True) if not l.strip().endswith("#")]) # remove empty comment lines
+        
+        # Whether it's selfreferencing: ex. struct Node { Node* parent; };
+        selfreferencing = text.find('POINTER('+name+')') != -1
+        
+        complex = name == "Scene"
+        
+        # Create description
+        description = ""
+        for line in desc.split('\n'):
+            description += " "*4 + line.strip() + "\n"  
+        description = description.rstrip()
+
+        # Create fields
+        fields = ""
+        for line in text.split('\n'):
+            fields += " "*12 + line.strip() + "\n"
+        fields = fields.strip()
+
+        if selfreferencing:
+            templ = templateSR
+        else:
+            templ = template
+            
+        # Put it all together
+        text = templ.replace('$NAME$', name)
+        text = text.replace('$DESCRIPTION$', description)
+        text = text.replace('$FIELDS$', fields)
+        
+        if ((name.lower() == fileName.split('.')[0][2:].lower()) and (name != 'Material')) or name == "String":
+            text = text.replace('$DEFINES$', defines)
+        else:
+            text = text.replace('$DEFINES$', '')
+
+        
+        result.append((primitive, selfreferencing, complex, text))
+             
+    return result   
+
+text = "#-*- coding: UTF-8 -*-\n\n"
+text += "from ctypes import POINTER, c_int, c_uint, c_size_t, c_char, c_float, Structure, c_char_p, c_double, c_ubyte\n\n"
+
+structs1 = ""
+structs2 = ""
+structs3 = ""
+structs4 = ""
+
+path = '../../../include/assimp'
+files = os.listdir (path)
+#files = ["aiScene.h", "aiTypes.h"]
+for fileName in files:
+    if fileName.endswith('.h'):
+        for struct in Structify(os.path.join(path, fileName)):
+            primitive, sr, complex, struct = struct
+            if primitive:
+                structs1 += struct
+            elif sr:
+                structs2 += struct
+            elif complex:
+                structs4 += struct
+            else:
+                structs3 += struct
+
+text += structs1 + structs2 + structs3 + structs4
+
+file = open('structs.py', 'w')
+file.write(text)
+file.close()
+
+print("Generation done. You can now review the file 'structs.py' and merge it.")
diff --git a/libs/assimp/port/PyAssimp/pyassimp/__init__.py b/libs/assimp/port/PyAssimp/pyassimp/__init__.py
new file mode 100644
index 0000000..bb67a43
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/pyassimp/__init__.py
@@ -0,0 +1 @@
+from .core import *
diff --git a/libs/assimp/port/PyAssimp/pyassimp/core.py b/libs/assimp/port/PyAssimp/pyassimp/core.py
new file mode 100644
index 0000000..35ad882
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/pyassimp/core.py
@@ -0,0 +1,556 @@
+"""
+PyAssimp
+
+This is the main-module of PyAssimp.
+"""
+
+import sys
+if sys.version_info < (2,6):
+    raise RuntimeError('pyassimp: need python 2.6 or newer')
+
+# xrange was renamed range in Python 3 and the original range from Python 2 was removed.
+# To keep compatibility with both Python 2 and 3, xrange is set to range for version 3.0 and up.
+if sys.version_info >= (3,0):
+    xrange = range
+
+
+try: 
+    import numpy
+except ImportError: 
+    numpy = None
+import logging
+import ctypes
+from contextlib import contextmanager
+logger = logging.getLogger("pyassimp")
+# attach default null handler to logger so it doesn't complain
+# even if you don't attach another handler to logger
+logger.addHandler(logging.NullHandler())
+
+from . import structs
+from . import helper
+from . import postprocess
+from .errors import AssimpError
+
+class AssimpLib(object):
+    """
+    Assimp-Singleton
+    """
+    load, load_mem, export, export_blob, release, dll = helper.search_library()
+_assimp_lib = AssimpLib()
+
+def make_tuple(ai_obj, type = None):
+    res = None
+
+    #notes:
+    # ai_obj._fields_ = [ ("attr", c_type), ... ]
+    # getattr(ai_obj, e[0]).__class__ == float
+
+    if isinstance(ai_obj, structs.Matrix4x4):
+        if numpy:
+            res = numpy.array([getattr(ai_obj, e[0]) for e in ai_obj._fields_]).reshape((4,4))
+            #import pdb;pdb.set_trace()
+        else:
+            res = [getattr(ai_obj, e[0]) for e in ai_obj._fields_]
+            res = [res[i:i+4] for i in xrange(0,16,4)]
+    elif isinstance(ai_obj, structs.Matrix3x3):
+        if numpy:
+            res = numpy.array([getattr(ai_obj, e[0]) for e in ai_obj._fields_]).reshape((3,3))
+        else:
+            res = [getattr(ai_obj, e[0]) for e in ai_obj._fields_]
+            res = [res[i:i+3] for i in xrange(0,9,3)]
+    else:
+        if numpy:
+            res = numpy.array([getattr(ai_obj, e[0]) for e in ai_obj._fields_])
+        else:
+            res = [getattr(ai_obj, e[0]) for e in ai_obj._fields_]
+
+    return res
+
+# Returns unicode object for Python 2, and str object for Python 3.
+def _convert_assimp_string(assimp_string):
+    if sys.version_info >= (3, 0):
+        return str(assimp_string.data, errors='ignore')
+    else:
+        return unicode(assimp_string.data, errors='ignore')
+
+# It is faster and more correct to have an init function for each assimp class
+def _init_face(aiFace):
+    aiFace.indices = [aiFace.mIndices[i] for i in range(aiFace.mNumIndices)]
+assimp_struct_inits =  { structs.Face : _init_face }
+
+def call_init(obj, caller = None):
+    if helper.hasattr_silent(obj,'contents'): #pointer
+        _init(obj.contents, obj, caller)
+    else:
+        _init(obj,parent=caller)
+
+def _is_init_type(obj):
+
+    if obj and helper.hasattr_silent(obj,'contents'): #pointer
+        return _is_init_type(obj[0])
+    # null-pointer case that arises when we reach a mesh attribute
+    # like mBitangents which use mNumVertices rather than mNumBitangents
+    # so it breaks the 'is iterable' check.
+    # Basically:
+    # FIXME!
+    elif not bool(obj):
+        return False
+    tname = obj.__class__.__name__
+    return not (tname[:2] == 'c_' or tname == 'Structure' \
+            or tname == 'POINTER') and not isinstance(obj, (int, str, bytes))
+
+def _init(self, target = None, parent = None):
+    """
+    Custom initialize() for C structs, adds safely accessible member functionality.
+
+    :param target: set the object which receive the added methods. Useful when manipulating
+    pointers, to skip the intermediate 'contents' deferencing.
+    """
+    if not target:
+        target = self
+
+    dirself = dir(self)
+    for m in dirself:
+
+        if m.startswith("_"):
+            continue
+
+        if m.startswith('mNum'):
+            if 'm' + m[4:] in dirself:
+                continue # will be processed later on
+            else:
+                name = m[1:].lower()
+
+                obj = getattr(self, m)
+                setattr(target, name, obj)
+                continue
+
+        if m == 'mName':
+            target.name = str(_convert_assimp_string(self.mName))
+            target.__class__.__repr__ = lambda x: str(x.__class__) + "(" + getattr(x, 'name','') + ")"
+            target.__class__.__str__ = lambda x: getattr(x, 'name', '')
+            continue
+
+        name = m[1:].lower()
+
+        obj = getattr(self, m)
+
+        # Create tuples
+        if isinstance(obj, structs.assimp_structs_as_tuple):
+            setattr(target, name, make_tuple(obj))
+            logger.debug(str(self) + ": Added array " + str(getattr(target, name)) +  " as self." + name.lower())
+            continue
+
+        if m.startswith('m') and len(m) > 1 and m[1].upper() == m[1]:
+
+            if name == "parent":
+                setattr(target, name, parent)
+                logger.debug("Added a parent as self." + name)
+                continue
+
+            if helper.hasattr_silent(self, 'mNum' + m[1:]):
+
+                length =  getattr(self, 'mNum' + m[1:])
+
+                # -> special case: properties are
+                # stored as a dict.
+                if m == 'mProperties':
+                    setattr(target, name, _get_properties(obj, length))
+                    continue
+
+
+                if not length: # empty!
+                    setattr(target, name, [])
+                    logger.debug(str(self) + ": " + name + " is an empty list.")
+                    continue
+
+
+                try:
+                    if obj._type_ in structs.assimp_structs_as_tuple:
+                        if numpy:
+                            setattr(target, name, numpy.array([make_tuple(obj[i]) for i in range(length)], dtype=numpy.float32))
+
+                            logger.debug(str(self) + ": Added an array of numpy arrays (type "+ str(type(obj)) + ") as self." + name)
+                        else:
+                            setattr(target, name, [make_tuple(obj[i]) for i in range(length)])
+
+                            logger.debug(str(self) + ": Added a list of lists (type "+ str(type(obj)) + ") as self." + name)
+
+                    else:
+                        setattr(target, name, [obj[i] for i in range(length)]) #TODO: maybe not necessary to recreate an array?
+
+                        logger.debug(str(self) + ": Added list of " + str(obj) + " " + name + " as self." + name + " (type: " + str(type(obj)) + ")")
+
+                        # initialize array elements
+                        try:
+                            init = assimp_struct_inits[type(obj[0])]
+                        except KeyError:
+                            if _is_init_type(obj[0]):
+                                for e in getattr(target, name):
+                                    call_init(e, target)
+                        else:
+                            for e in getattr(target, name):
+                                init(e)
+
+
+                except IndexError:
+                    logger.error("in " + str(self) +" : mismatch between mNum" + name + " and the actual amount of data in m" + name + ". This may be due to version mismatch between libassimp and pyassimp. Quitting now.")
+                    sys.exit(1)
+
+                except ValueError as e:
+
+                    logger.error("In " + str(self) +  "->" + name + ": " + str(e) + ". Quitting now.")
+                    if "setting an array element with a sequence" in str(e):
+                        logger.error("Note that pyassimp does not currently "
+                                     "support meshes with mixed triangles "
+                                     "and quads. Try to load your mesh with"
+                                     " a post-processing to triangulate your"
+                                     " faces.")
+                    raise e
+
+
+
+            else: # starts with 'm' but not iterable
+                setattr(target, m, obj)
+                logger.debug("Added " + name + " as self." + name + " (type: " + str(type(obj)) + ")")
+
+                if _is_init_type(obj):
+                    call_init(obj, target)
+
+    if isinstance(self, structs.Mesh):
+        _finalize_mesh(self, target)
+
+    if isinstance(self, structs.Texture):
+        _finalize_texture(self, target)
+
+    if isinstance(self, structs.Metadata):
+        _finalize_metadata(self, target)
+
+
+    return self
+
+
+def pythonize_assimp(type, obj, scene):
+    """ This method modify the Assimp data structures
+    to make them easier to work with in Python.
+
+    Supported operations:
+     - MESH: replace a list of mesh IDs by reference to these meshes
+     - ADDTRANSFORMATION: add a reference to an object's transformation taken from their associated node.
+
+    :param type: the type of modification to operate (cf above)
+    :param obj: the input object to modify
+    :param scene: a reference to the whole scene
+    """
+
+    if type == "MESH":
+        meshes = []
+        for i in obj:
+            meshes.append(scene.meshes[i])
+        return meshes
+
+    if type == "ADDTRANSFORMATION":
+        def getnode(node, name):
+            if node.name == name: return node
+            for child in node.children:
+                n = getnode(child, name)
+                if n: return n
+
+        node = getnode(scene.rootnode, obj.name)
+        if not node:
+            raise AssimpError("Object " + str(obj) + " has no associated node!")
+        setattr(obj, "transformation", node.transformation)
+
+def recur_pythonize(node, scene):
+    '''
+    Recursively call pythonize_assimp on
+    nodes tree to apply several post-processing to
+    pythonize the assimp datastructures.
+    '''
+    node.meshes = pythonize_assimp("MESH", node.meshes, scene)
+    for mesh in node.meshes:
+        mesh.material = scene.materials[mesh.materialindex]
+    for cam in scene.cameras:
+        pythonize_assimp("ADDTRANSFORMATION", cam, scene)
+    for c in node.children:
+        recur_pythonize(c, scene)
+
+def release(scene):
+    '''
+    Release resources of a loaded scene.
+    '''
+    _assimp_lib.release(ctypes.pointer(scene))
+
+@contextmanager
+def load(filename,
+         file_type  = None,
+         processing = postprocess.aiProcess_Triangulate):
+    '''
+    Load a model into a scene. On failure throws AssimpError.
+
+    Arguments
+    ---------
+    filename:   Either a filename or a file object to load model from.
+                If a file object is passed, file_type MUST be specified
+                Otherwise Assimp has no idea which importer to use.
+                This is named 'filename' so as to not break legacy code.
+    processing: assimp postprocessing parameters. Verbose keywords are imported
+                from postprocessing, and the parameters can be combined bitwise to
+                generate the final processing value. Note that the default value will
+                triangulate quad faces. Example of generating other possible values:
+                processing = (pyassimp.postprocess.aiProcess_Triangulate |
+                              pyassimp.postprocess.aiProcess_OptimizeMeshes)
+    file_type:  string of file extension, such as 'stl'
+
+    Returns
+    ---------
+    Scene object with model data
+    '''
+
+    if hasattr(filename, 'read'):
+        # This is the case where a file object has been passed to load.
+        # It is calling the following function:
+        # const aiScene* aiImportFileFromMemory(const char* pBuffer,
+        #                                      unsigned int pLength,
+        #                                      unsigned int pFlags,
+        #                                      const char* pHint)
+        if file_type is None:
+            raise AssimpError('File type must be specified when passing file objects!')
+        data  = filename.read()
+        model = _assimp_lib.load_mem(data,
+                                     len(data),
+                                     processing,
+                                     file_type)
+    else:
+        # a filename string has been passed
+        model = _assimp_lib.load(filename.encode(sys.getfilesystemencoding()), processing)
+
+    if not model:
+        raise AssimpError('Could not import file!')
+    scene = _init(model.contents)
+    recur_pythonize(scene.rootnode, scene)
+    try:
+        yield scene
+    finally:
+        release(scene)
+
+def export(scene,
+           filename,
+           file_type  = None,
+           processing = postprocess.aiProcess_Triangulate):
+    '''
+    Export a scene. On failure throws AssimpError.
+
+    Arguments
+    ---------
+    scene: scene to export.
+    filename: Filename that the scene should be exported to.
+    file_type: string of file exporter to use. For example "collada".
+    processing: assimp postprocessing parameters. Verbose keywords are imported
+                from postprocessing, and the parameters can be combined bitwise to
+                generate the final processing value. Note that the default value will
+                triangulate quad faces. Example of generating other possible values:
+                processing = (pyassimp.postprocess.aiProcess_Triangulate |
+                              pyassimp.postprocess.aiProcess_OptimizeMeshes)
+
+    '''
+
+    exportStatus = _assimp_lib.export(ctypes.pointer(scene), file_type.encode("ascii"), filename.encode(sys.getfilesystemencoding()), processing)
+
+    if exportStatus != 0:
+        raise AssimpError('Could not export scene!')
+
+def export_blob(scene,
+                file_type = None,
+                processing = postprocess.aiProcess_Triangulate):
+    '''
+    Export a scene and return a blob in the correct format. On failure throws AssimpError.
+
+    Arguments
+    ---------
+    scene: scene to export.
+    file_type: string of file exporter to use. For example "collada".
+    processing: assimp postprocessing parameters. Verbose keywords are imported
+                from postprocessing, and the parameters can be combined bitwise to
+                generate the final processing value. Note that the default value will
+                triangulate quad faces. Example of generating other possible values:
+                processing = (pyassimp.postprocess.aiProcess_Triangulate |
+                              pyassimp.postprocess.aiProcess_OptimizeMeshes)
+    Returns
+    ---------
+    Pointer to structs.ExportDataBlob
+    '''
+    exportBlobPtr = _assimp_lib.export_blob(ctypes.pointer(scene), file_type.encode("ascii"), processing)
+
+    if exportBlobPtr == 0:
+        raise AssimpError('Could not export scene to blob!')
+    return exportBlobPtr
+
+def _finalize_texture(tex, target):
+    setattr(target, "achformathint", tex.achFormatHint)
+    if numpy:
+        data = numpy.array([make_tuple(getattr(tex, "pcData")[i]) for i in range(tex.mWidth * tex.mHeight)])
+    else:
+        data = [make_tuple(getattr(tex, "pcData")[i]) for i in range(tex.mWidth * tex.mHeight)]
+    setattr(target, "data", data)
+
+def _finalize_mesh(mesh, target):
+    """ Building of meshes is a bit specific.
+
+    We override here the various datasets that can
+    not be process as regular fields.
+
+    For instance, the length of the normals array is
+    mNumVertices (no mNumNormals is available)
+    """
+    nb_vertices = getattr(mesh, "mNumVertices")
+
+    def fill(name):
+        mAttr = getattr(mesh, name)
+        if numpy:
+            if mAttr:
+                data = numpy.array([make_tuple(getattr(mesh, name)[i]) for i in range(nb_vertices)], dtype=numpy.float32)
+                setattr(target, name[1:].lower(), data)
+            else:
+                setattr(target, name[1:].lower(), numpy.array([], dtype="float32"))
+        else:
+            if mAttr:
+                data = [make_tuple(getattr(mesh, name)[i]) for i in range(nb_vertices)]
+                setattr(target, name[1:].lower(), data)
+            else:
+                setattr(target, name[1:].lower(), [])
+
+    def fillarray(name):
+        mAttr = getattr(mesh, name)
+
+        data = []
+        for index, mSubAttr in enumerate(mAttr):
+            if mSubAttr:
+                data.append([make_tuple(getattr(mesh, name)[index][i]) for i in range(nb_vertices)])
+
+        if numpy:
+            setattr(target, name[1:].lower(), numpy.array(data, dtype=numpy.float32))
+        else:
+            setattr(target, name[1:].lower(), data)
+
+    fill("mNormals")
+    fill("mTangents")
+    fill("mBitangents")
+
+    fillarray("mColors")
+    fillarray("mTextureCoords")
+
+    # prepare faces
+    if numpy:
+        faces = numpy.array([f.indices for f in target.faces], dtype=numpy.int32)
+    else:
+        faces = [f.indices for f in target.faces]
+    setattr(target, 'faces', faces)
+
+def _init_metadata_entry(entry):
+    entry.type = entry.mType
+    if entry.type == structs.MetadataEntry.AI_BOOL:
+        entry.data = ctypes.cast(entry.mData, ctypes.POINTER(ctypes.c_bool)).contents.value
+    elif entry.type == structs.MetadataEntry.AI_INT32:
+        entry.data = ctypes.cast(entry.mData, ctypes.POINTER(ctypes.c_int32)).contents.value
+    elif entry.type == structs.MetadataEntry.AI_UINT64:
+        entry.data = ctypes.cast(entry.mData, ctypes.POINTER(ctypes.c_uint64)).contents.value
+    elif entry.type == structs.MetadataEntry.AI_FLOAT:
+        entry.data = ctypes.cast(entry.mData, ctypes.POINTER(ctypes.c_float)).contents.value
+    elif entry.type == structs.MetadataEntry.AI_DOUBLE:
+        entry.data = ctypes.cast(entry.mData, ctypes.POINTER(ctypes.c_double)).contents.value
+    elif entry.type == structs.MetadataEntry.AI_AISTRING:
+        assimp_string = ctypes.cast(entry.mData, ctypes.POINTER(structs.String)).contents
+        entry.data = _convert_assimp_string(assimp_string)
+    elif entry.type == structs.MetadataEntry.AI_AIVECTOR3D:
+        assimp_vector = ctypes.cast(entry.mData, ctypes.POINTER(structs.Vector3D)).contents
+        entry.data = make_tuple(assimp_vector)
+
+    return entry
+
+def _finalize_metadata(metadata, target):
+    """ Building the metadata object is a bit specific.
+
+    Firstly, there are two separate arrays: one with metadata keys and one
+    with metadata values, and there are no corresponding mNum* attributes,
+    so the C arrays are not converted to Python arrays using the generic
+    code in the _init function.
+
+    Secondly, a metadata entry value has to be cast according to declared
+    metadata entry type.
+    """
+    length = metadata.mNumProperties
+    setattr(target, 'keys', [str(_convert_assimp_string(metadata.mKeys[i])) for i in range(length)])
+    setattr(target, 'values', [_init_metadata_entry(metadata.mValues[i]) for i in range(length)])
+
+class PropertyGetter(dict):
+    def __getitem__(self, key):
+        semantic = 0
+        if isinstance(key, tuple):
+            key, semantic = key
+
+        return dict.__getitem__(self, (key, semantic))
+
+    def keys(self):
+        for k in dict.keys(self):
+            yield k[0]
+
+    def __iter__(self):
+        return self.keys()
+
+    def items(self):
+        for k, v in dict.items(self):
+            yield k[0], v
+
+
+def _get_properties(properties, length):
+    """
+    Convenience Function to get the material properties as a dict
+    and values in a python format.
+    """
+    result = {}
+    #read all properties
+    for p in [properties[i] for i in range(length)]:
+        #the name
+        p = p.contents
+        key = str(_convert_assimp_string(p.mKey))
+        key = (key.split('.')[1], p.mSemantic)
+
+        #the data
+        if p.mType == 1:
+            arr = ctypes.cast(p.mData,
+                              ctypes.POINTER(ctypes.c_float * int(p.mDataLength/ctypes.sizeof(ctypes.c_float)))
+                              ).contents
+            value = [x for x in arr]
+        elif p.mType == 3: #string can't be an array
+            value = _convert_assimp_string(ctypes.cast(p.mData, ctypes.POINTER(structs.MaterialPropertyString)).contents)
+
+        elif p.mType == 4:
+            arr = ctypes.cast(p.mData,
+                              ctypes.POINTER(ctypes.c_int * int(p.mDataLength/ctypes.sizeof(ctypes.c_int)))
+                              ).contents
+            value = [x for x in arr]
+        else:
+            value = p.mData[:p.mDataLength]
+
+        if len(value) == 1:
+            [value] = value
+
+        result[key] = value
+
+    return PropertyGetter(result)
+
+def decompose_matrix(matrix):
+    if not isinstance(matrix, structs.Matrix4x4):
+        raise AssimpError("pyassimp.decompose_matrix failed: Not a Matrix4x4!")
+
+    scaling = structs.Vector3D()
+    rotation = structs.Quaternion()
+    position = structs.Vector3D()
+
+    _assimp_lib.dll.aiDecomposeMatrix(ctypes.pointer(matrix),
+                                      ctypes.byref(scaling),
+                                      ctypes.byref(rotation),
+                                      ctypes.byref(position))
+    return scaling._init(), rotation._init(), position._init()
+    
diff --git a/libs/assimp/port/PyAssimp/pyassimp/errors.py b/libs/assimp/port/PyAssimp/pyassimp/errors.py
new file mode 100644
index 0000000..e017b51
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/pyassimp/errors.py
@@ -0,0 +1,11 @@
+#-*- coding: UTF-8 -*-
+
+"""
+All possible errors.
+"""
+
+class AssimpError(BaseException):
+    """
+    If an internal error occurs.
+    """
+    pass
diff --git a/libs/assimp/port/PyAssimp/pyassimp/formats.py b/libs/assimp/port/PyAssimp/pyassimp/formats.py
new file mode 100644
index 0000000..5d454e5
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/pyassimp/formats.py
@@ -0,0 +1,41 @@
+FORMATS = ["CSM", 
+            "LWS", 
+            "B3D", 
+            "COB", 
+            "PLY", 
+            "IFC", 
+            "OFF", 
+            "SMD", 
+            "IRRMESH", 
+            "3D", 
+            "DAE", 
+            "MDL", 
+            "HMP", 
+            "TER", 
+            "WRL", 
+            "XML", 
+            "NFF", 
+            "AC", 
+            "OBJ", 
+            "3DS", 
+            "STL", 
+            "IRR", 
+            "Q3O",
+            "Q3D",
+            "MS3D", 
+            "Q3S", 
+            "ZGL", 
+            "MD2", 
+            "X", 
+            "BLEND", 
+            "XGL", 
+            "MD5MESH", 
+            "MAX", 
+            "LXO", 
+            "DXF", 
+            "BVH", 
+            "LWO",
+            "NDO"]
+
+def available_formats():
+    return FORMATS
diff --git a/libs/assimp/port/PyAssimp/pyassimp/helper.py b/libs/assimp/port/PyAssimp/pyassimp/helper.py
new file mode 100644
index 0000000..7c14f60
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/pyassimp/helper.py
@@ -0,0 +1,283 @@
+#-*- coding: UTF-8 -*-
+
+"""
+Some fancy helper functions.
+"""
+
+import os
+import ctypes
+import operator
+
+from distutils.sysconfig import get_python_lib
+import re
+import sys
+
+try: import numpy
+except ImportError: numpy = None
+
+import logging;logger = logging.getLogger("pyassimp")
+
+from .errors import AssimpError
+
+additional_dirs, ext_whitelist = [],[]
+
+# populate search directories and lists of allowed file extensions
+# depending on the platform we're running on.
+if os.name=='posix':
+    additional_dirs.append('./')
+    additional_dirs.append('/usr/lib/')
+    additional_dirs.append('/usr/lib/x86_64-linux-gnu/')
+    additional_dirs.append('/usr/lib/aarch64-linux-gnu/')
+    additional_dirs.append('/usr/local/lib/')
+
+    if 'LD_LIBRARY_PATH' in os.environ:
+        additional_dirs.extend([item for item in os.environ['LD_LIBRARY_PATH'].split(':') if item])
+
+    # check if running from anaconda.
+    anaconda_keywords = ("conda", "continuum")
+    if any(k in sys.version.lower() for k in anaconda_keywords):
+      cur_path = get_python_lib()
+      pattern = re.compile('.*\/lib\/')
+      conda_lib = pattern.match(cur_path).group()
+      logger.info("Adding Anaconda lib path:"+ conda_lib)
+      additional_dirs.append(conda_lib)
+
+    # note - this won't catch libassimp.so.N.n, but
+    # currently there's always a symlink called
+    # libassimp.so in /usr/local/lib.
+    ext_whitelist.append('.so')
+    # libassimp.dylib in /usr/local/lib
+    ext_whitelist.append('.dylib')
+
+elif os.name=='nt':
+    ext_whitelist.append('.dll')
+    path_dirs = os.environ['PATH'].split(';')
+    additional_dirs.extend(path_dirs)
+
+def vec2tuple(x):
+    """ Converts a VECTOR3D to a Tuple """
+    return (x.x, x.y, x.z)
+
+def transform(vector3, matrix4x4):
+    """ Apply a transformation matrix on a 3D vector.
+
+    :param vector3: array with 3 elements
+    :param matrix4x4: 4x4 matrix
+    """
+    if numpy:
+        return numpy.dot(matrix4x4, numpy.append(vector3, 1.))
+    else:
+        m0,m1,m2,m3 = matrix4x4; x,y,z = vector3
+        return [
+            m0[0]*x + m0[1]*y + m0[2]*z + m0[3],
+            m1[0]*x + m1[1]*y + m1[2]*z + m1[3],
+            m2[0]*x + m2[1]*y + m2[2]*z + m2[3],
+            m3[0]*x + m3[1]*y + m3[2]*z + m3[3]
+            ]
+
+def _inv(matrix4x4):
+    m0,m1,m2,m3 = matrix4x4
+
+    det  =  m0[3]*m1[2]*m2[1]*m3[0] - m0[2]*m1[3]*m2[1]*m3[0] - \
+            m0[3]*m1[1]*m2[2]*m3[0] + m0[1]*m1[3]*m2[2]*m3[0] + \
+            m0[2]*m1[1]*m2[3]*m3[0] - m0[1]*m1[2]*m2[3]*m3[0] - \
+            m0[3]*m1[2]*m2[0]*m3[1] + m0[2]*m1[3]*m2[0]*m3[1] + \
+            m0[3]*m1[0]*m2[2]*m3[1] - m0[0]*m1[3]*m2[2]*m3[1] - \
+            m0[2]*m1[0]*m2[3]*m3[1] + m0[0]*m1[2]*m2[3]*m3[1] + \
+            m0[3]*m1[1]*m2[0]*m3[2] - m0[1]*m1[3]*m2[0]*m3[2] - \
+            m0[3]*m1[0]*m2[1]*m3[2] + m0[0]*m1[3]*m2[1]*m3[2] + \
+            m0[1]*m1[0]*m2[3]*m3[2] - m0[0]*m1[1]*m2[3]*m3[2] - \
+            m0[2]*m1[1]*m2[0]*m3[3] + m0[1]*m1[2]*m2[0]*m3[3] + \
+            m0[2]*m1[0]*m2[1]*m3[3] - m0[0]*m1[2]*m2[1]*m3[3] - \
+            m0[1]*m1[0]*m2[2]*m3[3] + m0[0]*m1[1]*m2[2]*m3[3]
+
+    return[[( m1[2]*m2[3]*m3[1] - m1[3]*m2[2]*m3[1] + m1[3]*m2[1]*m3[2] - m1[1]*m2[3]*m3[2] - m1[2]*m2[1]*m3[3] + m1[1]*m2[2]*m3[3]) /det,
+            ( m0[3]*m2[2]*m3[1] - m0[2]*m2[3]*m3[1] - m0[3]*m2[1]*m3[2] + m0[1]*m2[3]*m3[2] + m0[2]*m2[1]*m3[3] - m0[1]*m2[2]*m3[3]) /det,
+            ( m0[2]*m1[3]*m3[1] - m0[3]*m1[2]*m3[1] + m0[3]*m1[1]*m3[2] - m0[1]*m1[3]*m3[2] - m0[2]*m1[1]*m3[3] + m0[1]*m1[2]*m3[3]) /det,
+            ( m0[3]*m1[2]*m2[1] - m0[2]*m1[3]*m2[1] - m0[3]*m1[1]*m2[2] + m0[1]*m1[3]*m2[2] + m0[2]*m1[1]*m2[3] - m0[1]*m1[2]*m2[3]) /det],
+           [( m1[3]*m2[2]*m3[0] - m1[2]*m2[3]*m3[0] - m1[3]*m2[0]*m3[2] + m1[0]*m2[3]*m3[2] + m1[2]*m2[0]*m3[3] - m1[0]*m2[2]*m3[3]) /det,
+            ( m0[2]*m2[3]*m3[0] - m0[3]*m2[2]*m3[0] + m0[3]*m2[0]*m3[2] - m0[0]*m2[3]*m3[2] - m0[2]*m2[0]*m3[3] + m0[0]*m2[2]*m3[3]) /det,
+            ( m0[3]*m1[2]*m3[0] - m0[2]*m1[3]*m3[0] - m0[3]*m1[0]*m3[2] + m0[0]*m1[3]*m3[2] + m0[2]*m1[0]*m3[3] - m0[0]*m1[2]*m3[3]) /det,
+            ( m0[2]*m1[3]*m2[0] - m0[3]*m1[2]*m2[0] + m0[3]*m1[0]*m2[2] - m0[0]*m1[3]*m2[2] - m0[2]*m1[0]*m2[3] + m0[0]*m1[2]*m2[3]) /det],
+           [( m1[1]*m2[3]*m3[0] - m1[3]*m2[1]*m3[0] + m1[3]*m2[0]*m3[1] - m1[0]*m2[3]*m3[1] - m1[1]*m2[0]*m3[3] + m1[0]*m2[1]*m3[3]) /det,
+            ( m0[3]*m2[1]*m3[0] - m0[1]*m2[3]*m3[0] - m0[3]*m2[0]*m3[1] + m0[0]*m2[3]*m3[1] + m0[1]*m2[0]*m3[3] - m0[0]*m2[1]*m3[3]) /det,
+            ( m0[1]*m1[3]*m3[0] - m0[3]*m1[1]*m3[0] + m0[3]*m1[0]*m3[1] - m0[0]*m1[3]*m3[1] - m0[1]*m1[0]*m3[3] + m0[0]*m1[1]*m3[3]) /det,
+            ( m0[3]*m1[1]*m2[0] - m0[1]*m1[3]*m2[0] - m0[3]*m1[0]*m2[1] + m0[0]*m1[3]*m2[1] + m0[1]*m1[0]*m2[3] - m0[0]*m1[1]*m2[3]) /det],
+           [( m1[2]*m2[1]*m3[0] - m1[1]*m2[2]*m3[0] - m1[2]*m2[0]*m3[1] + m1[0]*m2[2]*m3[1] + m1[1]*m2[0]*m3[2] - m1[0]*m2[1]*m3[2]) /det,
+            ( m0[1]*m2[2]*m3[0] - m0[2]*m2[1]*m3[0] + m0[2]*m2[0]*m3[1] - m0[0]*m2[2]*m3[1] - m0[1]*m2[0]*m3[2] + m0[0]*m2[1]*m3[2]) /det,
+            ( m0[2]*m1[1]*m3[0] - m0[1]*m1[2]*m3[0] - m0[2]*m1[0]*m3[1] + m0[0]*m1[2]*m3[1] + m0[1]*m1[0]*m3[2] - m0[0]*m1[1]*m3[2]) /det,
+            ( m0[1]*m1[2]*m2[0] - m0[2]*m1[1]*m2[0] + m0[2]*m1[0]*m2[1] - m0[0]*m1[2]*m2[1] - m0[1]*m1[0]*m2[2] + m0[0]*m1[1]*m2[2]) /det]]
+
+def get_bounding_box(scene):
+    bb_min = [1e10, 1e10, 1e10] # x,y,z
+    bb_max = [-1e10, -1e10, -1e10] # x,y,z
+    inv = numpy.linalg.inv if numpy else _inv
+    return get_bounding_box_for_node(scene.rootnode, bb_min, bb_max, inv(scene.rootnode.transformation))
+
+def get_bounding_box_for_node(node, bb_min, bb_max, transformation):
+
+    if numpy:
+        transformation = numpy.dot(transformation, node.transformation)
+    else:
+        t0,t1,t2,t3 = transformation
+        T0,T1,T2,T3 = node.transformation
+        transformation = [ [
+                t0[0]*T0[0] + t0[1]*T1[0] + t0[2]*T2[0] + t0[3]*T3[0],
+                t0[0]*T0[1] + t0[1]*T1[1] + t0[2]*T2[1] + t0[3]*T3[1],
+                t0[0]*T0[2] + t0[1]*T1[2] + t0[2]*T2[2] + t0[3]*T3[2],
+                t0[0]*T0[3] + t0[1]*T1[3] + t0[2]*T2[3] + t0[3]*T3[3]
+            ],[
+                t1[0]*T0[0] + t1[1]*T1[0] + t1[2]*T2[0] + t1[3]*T3[0],
+                t1[0]*T0[1] + t1[1]*T1[1] + t1[2]*T2[1] + t1[3]*T3[1],
+                t1[0]*T0[2] + t1[1]*T1[2] + t1[2]*T2[2] + t1[3]*T3[2],
+                t1[0]*T0[3] + t1[1]*T1[3] + t1[2]*T2[3] + t1[3]*T3[3]
+            ],[
+                t2[0]*T0[0] + t2[1]*T1[0] + t2[2]*T2[0] + t2[3]*T3[0],
+                t2[0]*T0[1] + t2[1]*T1[1] + t2[2]*T2[1] + t2[3]*T3[1],
+                t2[0]*T0[2] + t2[1]*T1[2] + t2[2]*T2[2] + t2[3]*T3[2],
+                t2[0]*T0[3] + t2[1]*T1[3] + t2[2]*T2[3] + t2[3]*T3[3]
+            ],[
+                t3[0]*T0[0] + t3[1]*T1[0] + t3[2]*T2[0] + t3[3]*T3[0],
+                t3[0]*T0[1] + t3[1]*T1[1] + t3[2]*T2[1] + t3[3]*T3[1],
+                t3[0]*T0[2] + t3[1]*T1[2] + t3[2]*T2[2] + t3[3]*T3[2],
+                t3[0]*T0[3] + t3[1]*T1[3] + t3[2]*T2[3] + t3[3]*T3[3]
+            ] ]
+
+    for mesh in node.meshes:
+        for v in mesh.vertices:
+            v = transform(v, transformation)
+            bb_min[0] = min(bb_min[0], v[0])
+            bb_min[1] = min(bb_min[1], v[1])
+            bb_min[2] = min(bb_min[2], v[2])
+            bb_max[0] = max(bb_max[0], v[0])
+            bb_max[1] = max(bb_max[1], v[1])
+            bb_max[2] = max(bb_max[2], v[2])
+
+
+    for child in node.children:
+        bb_min, bb_max = get_bounding_box_for_node(child, bb_min, bb_max, transformation)
+
+    return bb_min, bb_max
+
+def try_load_functions(library_path, dll):
+    '''
+    Try to bind to aiImportFile and aiReleaseImport
+
+    Arguments
+    ---------
+    library_path: path to current lib
+    dll:          ctypes handle to library
+
+    Returns
+    ---------
+    If unsuccessful:
+        None
+    If successful:
+        Tuple containing (library_path,
+                          load from filename function,
+                          load from memory function,
+                          export to filename function,
+                          export to blob function,
+                          release function,
+                          ctypes handle to assimp library)
+    '''
+
+    try:
+        load     = dll.aiImportFile
+        release  = dll.aiReleaseImport
+        load_mem = dll.aiImportFileFromMemory
+        export   = dll.aiExportScene
+        export2blob = dll.aiExportSceneToBlob
+    except AttributeError:
+        #OK, this is a library, but it doesn't have the functions we need
+        return None
+
+    # library found!
+    from .structs import Scene, ExportDataBlob
+    load.restype = ctypes.POINTER(Scene)
+    load_mem.restype = ctypes.POINTER(Scene)
+    export2blob.restype = ctypes.POINTER(ExportDataBlob)
+    return (library_path, load, load_mem, export, export2blob, release, dll)
+
+def search_library():
+    '''
+    Loads the assimp library.
+    Throws exception AssimpError if no library_path is found
+
+    Returns: tuple, (load from filename function,
+                     load from memory function,
+                     export to filename function,
+                     export to blob function,
+                     release function,
+                     dll)
+    '''
+    #this path
+    folder = os.path.dirname(__file__)
+
+    # silence 'DLL not found' message boxes on win
+    try:
+        ctypes.windll.kernel32.SetErrorMode(0x8007)
+    except AttributeError:
+        pass
+
+    candidates = []
+    # test every file
+    for curfolder in [folder]+additional_dirs:
+        if os.path.isdir(curfolder):
+            for filename in os.listdir(curfolder):
+                # our minimum requirement for candidates is that
+                # they should contain 'assimp' somewhere in
+                # their name                                  
+                if filename.lower().find('assimp')==-1 : 
+                    continue
+                is_out=1
+                for et in ext_whitelist:
+                  if et in filename.lower():
+                    is_out=0
+                    break
+                if is_out:
+                  continue
+                
+                library_path = os.path.join(curfolder, filename)
+                logger.debug('Try ' + library_path)
+                try:
+                    dll = ctypes.cdll.LoadLibrary(library_path)
+                except Exception as e:
+                    logger.warning(str(e))
+                    # OK, this except is evil. But different OSs will throw different
+                    # errors. So just ignore any errors.
+                    continue
+                # see if the functions we need are in the dll
+                loaded = try_load_functions(library_path, dll)
+                if loaded: candidates.append(loaded)
+
+    if not candidates:
+        # no library found
+        raise AssimpError("assimp library not found")
+    else:
+        # get the newest library_path
+        candidates = map(lambda x: (os.lstat(x[0])[-2], x), candidates)
+        res = max(candidates, key=operator.itemgetter(0))[1]
+        logger.debug('Using assimp library located at ' + res[0])
+
+        # XXX: if there are 1000 dll/so files containing 'assimp'
+        # in their name, do we have all of them in our address
+        # space now until gc kicks in?
+
+        # XXX: take version postfix of the .so on linux?
+        return res[1:]
+
+def hasattr_silent(object, name):
+    """
+        Calls hasttr() with the given parameters and preserves the legacy (pre-Python 3.2)
+        functionality of silently catching exceptions.
+
+        Returns the result of hasatter() or False if an exception was raised.
+    """
+
+    try:
+        if not object:
+            return False
+        return hasattr(object, name)
+    except AttributeError:
+        return False
diff --git a/libs/assimp/port/PyAssimp/pyassimp/material.py b/libs/assimp/port/PyAssimp/pyassimp/material.py
new file mode 100644
index 0000000..a36e50a
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/pyassimp/material.py
@@ -0,0 +1,89 @@
+# Dummy value.
+#
+#  No texture, but the value to be used as 'texture semantic'
+#  (#aiMaterialProperty::mSemantic) for all material properties
+# # not* related to textures.
+#
+aiTextureType_NONE = 0x0
+
+# The texture is combined with the result of the diffuse
+#  lighting equation.
+#
+aiTextureType_DIFFUSE = 0x1
+
+# The texture is combined with the result of the specular
+#  lighting equation.
+#
+aiTextureType_SPECULAR = 0x2
+
+# The texture is combined with the result of the ambient
+#  lighting equation.
+#
+aiTextureType_AMBIENT = 0x3
+
+# The texture is added to the result of the lighting
+#  calculation. It isn't influenced by incoming light.
+#
+aiTextureType_EMISSIVE = 0x4
+
+# The texture is a height map.
+#
+#  By convention, higher gray-scale values stand for
+#  higher elevations from the base height.
+#
+aiTextureType_HEIGHT = 0x5
+
+# The texture is a (tangent space) normal-map.
+#
+#  Again, there are several conventions for tangent-space
+#  normal maps. Assimp does (intentionally) not
+#  distinguish here.
+#
+aiTextureType_NORMALS = 0x6
+
+# The texture defines the glossiness of the material.
+#
+#  The glossiness is in fact the exponent of the specular
+#  (phong) lighting equation. Usually there is a conversion
+#  function defined to map the linear color values in the
+#  texture to a suitable exponent. Have fun.
+#
+aiTextureType_SHININESS = 0x7
+
+# The texture defines per-pixel opacity.
+#
+#  Usually 'white' means opaque and 'black' means
+#  'transparency'. Or quite the opposite. Have fun.
+#
+aiTextureType_OPACITY = 0x8
+
+# Displacement texture
+#
+#  The exact purpose and format is application-dependent.
+#  Higher color values stand for higher vertex displacements.
+#
+aiTextureType_DISPLACEMENT = 0x9
+
+# Lightmap texture (aka Ambient Occlusion)
+#
+#  Both 'Lightmaps' and dedicated 'ambient occlusion maps' are
+#  covered by this material property. The texture contains a
+#  scaling value for the final color value of a pixel. Its
+#  intensity is not affected by incoming light.
+#
+aiTextureType_LIGHTMAP = 0xA
+
+# Reflection texture
+#
+# Contains the color of a perfect mirror reflection.
+# Rarely used, almost never for real-time applications.
+#
+aiTextureType_REFLECTION = 0xB
+
+# Unknown texture
+#
+#  A texture reference that does not match any of the definitions
+#  above is considered to be 'unknown'. It is still imported
+#  but is excluded from any further postprocessing.
+#
+aiTextureType_UNKNOWN = 0xC
diff --git a/libs/assimp/port/PyAssimp/pyassimp/postprocess.py b/libs/assimp/port/PyAssimp/pyassimp/postprocess.py
new file mode 100644
index 0000000..0c55d67
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/pyassimp/postprocess.py
@@ -0,0 +1,530 @@
+# <hr>Calculates the tangents and bitangents for the imported meshes. 
+#
+# Does nothing if a mesh does not have normals. You might want this post 
+# processing step to be executed if you plan to use tangent space calculations 
+# such as normal mapping  applied to the meshes. There's a config setting,
+# <tt>#AI_CONFIG_PP_CT_MAX_SMOOTHING_ANGLE<tt>, which allows you to specify
+# a maximum smoothing angle for the algorithm. However, usually you'll
+# want to leave it at the default value.
+#
+aiProcess_CalcTangentSpace = 0x1
+
+## <hr>Identifies and joins identical vertex data sets within all 
+#  imported meshes. 
+# 
+# After this step is run, each mesh contains unique vertices,
+# so a vertex may be used by multiple faces. You usually want
+# to use this post processing step. If your application deals with
+# indexed geometry, this step is compulsory or you'll just waste rendering
+# time. <b>If this flag is not specified<b>, no vertices are referenced by
+# more than one face and <b>no index buffer is required<b> for rendering.
+#
+aiProcess_JoinIdenticalVertices = 0x2
+
+## <hr>Converts all the imported data to a left-handed coordinate space. 
+#
+# By default the data is returned in a right-handed coordinate space (which 
+# OpenGL prefers). In this space, +X points to the right, 
+# +Z points towards the viewer, and +Y points upwards. In the DirectX 
+# coordinate space +X points to the right, +Y points upwards, and +Z points 
+# away from the viewer.
+#
+# You'll probably want to consider this flag if you use Direct3D for
+# rendering. The #aiProcess_ConvertToLeftHanded flag supersedes this
+# setting and bundles all conversions typically required for D3D-based
+# applications.
+#
+aiProcess_MakeLeftHanded = 0x4
+
+## <hr>Triangulates all faces of all meshes. 
+#
+# By default the imported mesh data might contain faces with more than 3
+# indices. For rendering you'll usually want all faces to be triangles. 
+# This post processing step splits up faces with more than 3 indices into 
+# triangles. Line and point primitives are #not# modified! If you want
+# 'triangles only' with no other kinds of primitives, try the following
+# solution:
+# <ul>
+# <li>Specify both #aiProcess_Triangulate and #aiProcess_SortByPType <li>
+# <li>Ignore all point and line meshes when you process assimp's output<li>
+# <ul>
+#
+aiProcess_Triangulate = 0x8
+
+## <hr>Removes some parts of the data structure (animations, materials, 
+#  light sources, cameras, textures, vertex components).
+#
+# The  components to be removed are specified in a separate
+# configuration option, <tt>#AI_CONFIG_PP_RVC_FLAGS<tt>. This is quite useful
+# if you don't need all parts of the output structure. Vertex colors
+# are rarely used today for example... Calling this step to remove unneeded
+# data from the pipeline as early as possible results in increased 
+# performance and a more optimized output data structure.
+# This step is also useful if you want to force Assimp to recompute 
+# normals or tangents. The corresponding steps don't recompute them if 
+# they're already there (loaded from the source asset). By using this 
+# step you can make sure they are NOT there.
+#
+# This flag is a poor one, mainly because its purpose is usually
+# misunderstood. Consider the following case: a 3D model has been exported
+# from a CAD app, and it has per-face vertex colors. Vertex positions can't be
+# shared, thus the #aiProcess_JoinIdenticalVertices step fails to
+# optimize the data because of these nasty little vertex colors.
+# Most apps don't even process them, so it's all for nothing. By using
+# this step, unneeded components are excluded as early as possible
+# thus opening more room for internal optimizations. 
+#
+aiProcess_RemoveComponent = 0x10
+
+## <hr>Generates normals for all faces of all meshes. 
+#
+# This is ignored if normals are already there at the time this flag 
+# is evaluated. Model importers try to load them from the source file, so
+# they're usually already there. Face normals are shared between all points
+# of a single face, so a single point can have multiple normals, which
+# forces the library to duplicate vertices in some cases.
+# #aiProcess_JoinIdenticalVertices is #senseless# then.
+#
+# This flag may not be specified together with #aiProcess_GenSmoothNormals.
+#
+aiProcess_GenNormals = 0x20
+
+## <hr>Generates smooth normals for all vertices in the mesh.
+#
+# This is ignored if normals are already there at the time this flag 
+# is evaluated. Model importers try to load them from the source file, so
+# they're usually already there. 
+#
+# This flag may not be specified together with 
+# #aiProcess_GenNormals. There's a configuration option, 
+# <tt>#AI_CONFIG_PP_GSN_MAX_SMOOTHING_ANGLE<tt> which allows you to specify
+# an angle maximum for the normal smoothing algorithm. Normals exceeding
+# this limit are not smoothed, resulting in a 'hard' seam between two faces.
+# Using a decent angle here (e.g. 80 degrees) results in very good visual
+# appearance.
+#
+aiProcess_GenSmoothNormals = 0x40
+
+## <hr>Splits large meshes into smaller sub-meshes.
+#
+# This is quite useful for real-time rendering, where the number of triangles
+# which can be maximally processed in a single draw-call is limited 
+# by the video driverhardware. The maximum vertex buffer is usually limited
+# too. Both requirements can be met with this step: you may specify both a 
+# triangle and vertex limit for a single mesh.
+#
+# The split limits can (and should!) be set through the 
+# <tt>#AI_CONFIG_PP_SLM_VERTEX_LIMIT<tt> and <tt>#AI_CONFIG_PP_SLM_TRIANGLE_LIMIT<tt> 
+# settings. The default values are <tt>#AI_SLM_DEFAULT_MAX_VERTICES<tt> and 
+# <tt>#AI_SLM_DEFAULT_MAX_TRIANGLES<tt>. 
+#
+# Note that splitting is generally a time-consuming task, but only if there's
+# something to split. The use of this step is recommended for most users.
+#
+aiProcess_SplitLargeMeshes = 0x80
+
+## <hr>Removes the node graph and pre-transforms all vertices with
+# the local transformation matrices of their nodes.
+#
+# The output scene still contains nodes, however there is only a
+# root node with children, each one referencing only one mesh,
+# and each mesh referencing one material. For rendering, you can
+# simply render all meshes in order - you don't need to pay
+# attention to local transformations and the node hierarchy.
+# Animations are removed during this step.
+# This step is intended for applications without a scenegraph.
+# The step CAN cause some problems: if e.g. a mesh of the asset
+# contains normals and another, using the same material index, does not, 
+# they will be brought together, but the first meshes's part of
+# the normal list is zeroed. However, these artifacts are rare.
+# @note The <tt>#AI_CONFIG_PP_PTV_NORMALIZE<tt> configuration property
+# can be set to normalize the scene's spatial dimension to the -1...1
+# range. 
+#
+aiProcess_PreTransformVertices = 0x100
+
+## <hr>Limits the number of bones simultaneously affecting a single vertex
+#  to a maximum value.
+#
+# If any vertex is affected by more than the maximum number of bones, the least 
+# important vertex weights are removed and the remaining vertex weights are
+# renormalized so that the weights still sum up to 1.
+# The default bone weight limit is 4 (defined as <tt>#AI_LMW_MAX_WEIGHTS<tt> in
+# config.h), but you can use the <tt>#AI_CONFIG_PP_LBW_MAX_WEIGHTS<tt> setting to
+# supply your own limit to the post processing step.
+#
+# If you intend to perform the skinning in hardware, this post processing 
+# step might be of interest to you.
+#
+aiProcess_LimitBoneWeights = 0x200
+
+## <hr>Validates the imported scene data structure.
+# This makes sure that all indices are valid, all animations and
+# bones are linked correctly, all material references are correct .. etc.
+#
+# It is recommended that you capture Assimp's log output if you use this flag,
+# so you can easily find out what's wrong if a file fails the
+# validation. The validator is quite strict and will find #all#
+# inconsistencies in the data structure... It is recommended that plugin 
+# developers use it to debug their loaders. There are two types of
+# validation failures:
+# <ul>
+# <li>Error: There's something wrong with the imported data. Further
+#   postprocessing is not possible and the data is not usable at all.
+#   The import fails. #Importer::GetErrorString() or #aiGetErrorString()
+#   carry the error message around.<li>
+# <li>Warning: There are some minor issues (e.g. 1000000 animation 
+#   keyframes with the same time), but further postprocessing and use
+#   of the data structure is still safe. Warning details are written
+#   to the log file, <tt>#AI_SCENE_FLAGS_VALIDATION_WARNING<tt> is set
+#   in #aiScene::mFlags<li>
+# <ul>
+#
+# This post-processing step is not time-consuming. Its use is not
+# compulsory, but recommended. 
+#
+aiProcess_ValidateDataStructure = 0x400
+
+## <hr>Reorders triangles for better vertex cache locality.
+#
+# The step tries to improve the ACMR (average post-transform vertex cache
+# miss ratio) for all meshes. The implementation runs in O(n) and is 
+# roughly based on the 'tipsify' algorithm (see <a href="
+# http:www.cs.princeton.edugfxpubsSander_2007_%3ETRtipsy.pdf">this
+# paper<a>).
+#
+# If you intend to render huge models in hardware, this step might
+# be of interest to you. The <tt>#AI_CONFIG_PP_ICL_PTCACHE_SIZE<tt>config
+# setting can be used to fine-tune the cache optimization.
+#
+aiProcess_ImproveCacheLocality = 0x800
+
+## <hr>Searches for redundantunreferenced materials and removes them.
+#
+# This is especially useful in combination with the 
+# #aiProcess_PretransformVertices and #aiProcess_OptimizeMeshes flags. 
+# Both join small meshes with equal characteristics, but they can't do 
+# their work if two meshes have different materials. Because several
+# material settings are lost during Assimp's import filters,
+# (and because many exporters don't check for redundant materials), huge
+# models often have materials which are are defined several times with
+# exactly the same settings.
+#
+# Several material settings not contributing to the final appearance of
+# a surface are ignored in all comparisons (e.g. the material name).
+# So, if you're passing additional information through the
+# content pipeline (probably using #magic# material names), don't 
+# specify this flag. Alternatively take a look at the
+# <tt>#AI_CONFIG_PP_RRM_EXCLUDE_LIST<tt> setting.
+# 
+aiProcess_RemoveRedundantMaterials = 0x1000
+
+## <hr>This step tries to determine which meshes have normal vectors 
+# that are facing inwards and inverts them.
+#
+# The algorithm is simple but effective:
+# the bounding box of all vertices + their normals is compared against
+# the volume of the bounding box of all vertices without their normals.
+# This works well for most objects, problems might occur with planar
+# surfaces. However, the step tries to filter such cases.
+# The step inverts all in-facing normals. Generally it is recommended
+# to enable this step, although the result is not always correct.
+#
+aiProcess_FixInfacingNormals = 0x2000
+
+## <hr>This step splits meshes with more than one primitive type in 
+#  homogeneous sub-meshes. 
+#
+#  The step is executed after the triangulation step. After the step
+#  returns, just one bit is set in aiMesh::mPrimitiveTypes. This is 
+#  especially useful for real-time rendering where point and line
+#  primitives are often ignored or rendered separately.
+#  You can use the <tt>#AI_CONFIG_PP_SBP_REMOVE<tt> option to specify which
+#  primitive types you need. This can be used to easily exclude
+#  lines and points, which are rarely used, from the import.
+#
+aiProcess_SortByPType = 0x8000
+
+## <hr>This step searches all meshes for degenerate primitives and
+#  converts them to proper lines or points.
+#
+# A face is 'degenerate' if one or more of its points are identical.
+# To have the degenerate stuff not only detected and collapsed but
+# removed, try one of the following procedures:
+# <br><b>1.<b> (if you support lines and points for rendering but don't
+#    want the degenerates)<br>
+# <ul>
+#   <li>Specify the #aiProcess_FindDegenerates flag.
+#   <li>
+#   <li>Set the <tt>AI_CONFIG_PP_FD_REMOVE<tt> option to 1. This will 
+#       cause the step to remove degenerate triangles from the import
+#       as soon as they're detected. They won't pass any further
+#       pipeline steps.
+#   <li>
+# <ul>
+# <br><b>2.<b>(if you don't support lines and points at all)<br>
+# <ul>
+#   <li>Specify the #aiProcess_FindDegenerates flag.
+#   <li>
+#   <li>Specify the #aiProcess_SortByPType flag. This moves line and
+#     point primitives to separate meshes.
+#   <li>
+#   <li>Set the <tt>AI_CONFIG_PP_SBP_REMOVE<tt> option to 
+#       @code aiPrimitiveType_POINTS | aiPrimitiveType_LINES
+#       @endcode to cause SortByPType to reject point
+#       and line meshes from the scene.
+#   <li>
+# <ul>
+# @note Degenerate polygons are not necessarily evil and that's why
+# they're not removed by default. There are several file formats which 
+# don't support lines or points, and some exporters bypass the
+# format specification and write them as degenerate triangles instead.
+#
+aiProcess_FindDegenerates = 0x10000
+
+## <hr>This step searches all meshes for invalid data, such as zeroed
+#  normal vectors or invalid UV coords and removesfixes them. This is
+#  intended to get rid of some common exporter errors.
+#
+# This is especially useful for normals. If they are invalid, and
+# the step recognizes this, they will be removed and can later
+# be recomputed, i.e. by the #aiProcess_GenSmoothNormals flag.<br>
+# The step will also remove meshes that are infinitely small and reduce
+# animation tracks consisting of hundreds if redundant keys to a single
+# key. The <tt>AI_CONFIG_PP_FID_ANIM_ACCURACY<tt> config property decides
+# the accuracy of the check for duplicate animation tracks.
+#
+aiProcess_FindInvalidData = 0x20000
+
+## <hr>This step converts non-UV mappings (such as spherical or
+#  cylindrical mapping) to proper texture coordinate channels.
+#
+# Most applications will support UV mapping only, so you will
+# probably want to specify this step in every case. Note that Assimp is not
+# always able to match the original mapping implementation of the 
+# 3D app which produced a model perfectly. It's always better to let the
+# modelling app compute the UV channels - 3ds max, Maya, Blender, 
+# LightWave, and Modo do this for example.
+#
+# @note If this step is not requested, you'll need to process the
+# <tt>#AI_MATKEY_MAPPING<tt> material property in order to display all assets
+# properly.
+#
+aiProcess_GenUVCoords = 0x40000
+
+## <hr>This step applies per-texture UV transformations and bakes
+#  them into stand-alone vtexture coordinate channels.
+#  
+# UV transformations are specified per-texture - see the 
+# <tt>#AI_MATKEY_UVTRANSFORM<tt> material key for more information. 
+# This step processes all textures with 
+# transformed input UV coordinates and generates a new (pre-transformed) UV channel 
+# which replaces the old channel. Most applications won't support UV 
+# transformations, so you will probably want to specify this step.
+#
+# @note UV transformations are usually implemented in real-time apps by 
+# transforming texture coordinates at vertex shader stage with a 3x3
+# (homogenous) transformation matrix.
+#
+aiProcess_TransformUVCoords = 0x80000
+
+## <hr>This step searches for duplicate meshes and replaces them
+#  with references to the first mesh.
+#
+#  This step takes a while, so don't use it if speed is a concern.
+#  Its main purpose is to workaround the fact that many export
+#  file formats don't support instanced meshes, so exporters need to
+#  duplicate meshes. This step removes the duplicates again. Please 
+#  note that Assimp does not currently support per-node material
+#  assignment to meshes, which means that identical meshes with
+#  different materials are currently #not# joined, although this is 
+#  planned for future versions.
+#
+aiProcess_FindInstances = 0x100000
+
+## <hr>A postprocessing step to reduce the number of meshes.
+#
+#  This will, in fact, reduce the number of draw calls.
+#
+#  This is a very effective optimization and is recommended to be used
+#  together with #aiProcess_OptimizeGraph, if possible. The flag is fully
+#  compatible with both #aiProcess_SplitLargeMeshes and #aiProcess_SortByPType.
+#
+aiProcess_OptimizeMeshes  = 0x200000
+
+
+## <hr>A postprocessing step to optimize the scene hierarchy. 
+#
+#  Nodes without animations, bones, lights or cameras assigned are 
+#  collapsed and joined.
+#
+#  Node names can be lost during this step. If you use special 'tag nodes'
+#  to pass additional information through your content pipeline, use the
+#  <tt>#AI_CONFIG_PP_OG_EXCLUDE_LIST<tt> setting to specify a list of node 
+#  names you want to be kept. Nodes matching one of the names in this list won't
+#  be touched or modified.
+#
+#  Use this flag with caution. Most simple files will be collapsed to a 
+#  single node, so complex hierarchies are usually completely lost. This is not
+#  useful for editor environments, but probably a very effective
+#  optimization if you just want to get the model data, convert it to your
+#  own format, and render it as fast as possible. 
+#
+#  This flag is designed to be used with #aiProcess_OptimizeMeshes for best
+#  results.
+#
+#  @note 'Crappy' scenes with thousands of extremely small meshes packed
+#  in deeply nested nodes exist for almost all file formats.
+#  #aiProcess_OptimizeMeshes in combination with #aiProcess_OptimizeGraph 
+#  usually fixes them all and makes them renderable. 
+#
+aiProcess_OptimizeGraph  = 0x400000
+
+## <hr>This step flips all UV coordinates along the y-axis and adjusts
+# material settings and bitangents accordingly.
+#
+# <b>Output UV coordinate system:<b>
+# @code
+# 0y|0y ---------- 1x|0y 
+# |                 |
+# |                 |
+# |                 |
+# 0x|1y ---------- 1x|1y
+# @endcode
+#
+# You'll probably want to consider this flag if you use Direct3D for
+# rendering. The #aiProcess_ConvertToLeftHanded flag supersedes this
+# setting and bundles all conversions typically required for D3D-based
+# applications.
+#
+aiProcess_FlipUVs = 0x800000
+
+## <hr>This step adjusts the output face winding order to be CW.
+#
+# The default face winding order is counter clockwise (CCW).
+#
+# <b>Output face order:<b>
+# @code
+#       x2
+#           
+#                         x0
+#  x1
+# @endcode
+#
+aiProcess_FlipWindingOrder  = 0x1000000
+
+## <hr>This step splits meshes with many bones into sub-meshes so that each
+# su-bmesh has fewer or as many bones as a given limit. 
+#
+aiProcess_SplitByBoneCount  = 0x2000000
+
+## <hr>This step removes bones losslessly or according to some threshold.
+#
+#  In some cases (i.e. formats that require it) exporters are forced to
+#  assign dummy bone weights to otherwise static meshes assigned to
+#  animated meshes. Full, weight-based skinning is expensive while
+#  animating nodes is extremely cheap, so this step is offered to clean up
+#  the data in that regard. 
+#                                                              
+#  Use <tt>#AI_CONFIG_PP_DB_THRESHOLD<tt> to control this. 
+#  Use <tt>#AI_CONFIG_PP_DB_ALL_OR_NONE<tt> if you want bones removed if and 
+#  only if all bones within the scene qualify for removal.
+#
+aiProcess_Debone  = 0x4000000
+
+aiProcess_GenEntityMeshes = 0x100000
+aiProcess_OptimizeAnimations = 0x200000
+aiProcess_FixTexturePaths = 0x200000
+aiProcess_EmbedTextures  = 0x10000000,
+
+## @def aiProcess_ConvertToLeftHanded
+ #  @brief Shortcut flag for Direct3D-based applications. 
+ #
+ #  Supersedes the #aiProcess_MakeLeftHanded and #aiProcess_FlipUVs and
+ #  #aiProcess_FlipWindingOrder flags.
+ #  The output data matches Direct3D's conventions: left-handed geometry, upper-left
+ #  origin for UV coordinates and finally clockwise face order, suitable for CCW culling.
+ #
+ #  @deprecated 
+ #
+aiProcess_ConvertToLeftHanded = ( \
+    aiProcess_MakeLeftHanded     | \
+    aiProcess_FlipUVs            | \
+    aiProcess_FlipWindingOrder   | \
+    0 ) 
+
+
+## @def aiProcessPreset_TargetRealtimeUse_Fast
+ #  @brief Default postprocess configuration optimizing the data for real-time rendering.
+ #  
+ #  Applications would want to use this preset to load models on end-user PCs,
+ #  maybe for direct use in game.
+ #
+ # If you're using DirectX, don't forget to combine this value with
+ # the #aiProcess_ConvertToLeftHanded step. If you don't support UV transformations
+ # in your application apply the #aiProcess_TransformUVCoords step, too.
+ #  @note Please take the time to read the docs for the steps enabled by this preset. 
+ #  Some of them offer further configurable properties, while some of them might not be of
+ #  use for you so it might be better to not specify them.
+ #
+aiProcessPreset_TargetRealtime_Fast = ( \
+    aiProcess_CalcTangentSpace      |  \
+    aiProcess_GenNormals            |  \
+    aiProcess_JoinIdenticalVertices |  \
+    aiProcess_Triangulate           |  \
+    aiProcess_GenUVCoords           |  \
+    aiProcess_SortByPType           |  \
+    0 )
+
+ ## @def aiProcessPreset_TargetRealtime_Quality
+  #  @brief Default postprocess configuration optimizing the data for real-time rendering.
+  #
+  #  Unlike #aiProcessPreset_TargetRealtime_Fast, this configuration
+  #  performs some extra optimizations to improve rendering speed and
+  #  to minimize memory usage. It could be a good choice for a level editor
+  #  environment where import speed is not so important.
+  #  
+  #  If you're using DirectX, don't forget to combine this value with
+  #  the #aiProcess_ConvertToLeftHanded step. If you don't support UV transformations
+  #  in your application apply the #aiProcess_TransformUVCoords step, too.
+  #  @note Please take the time to read the docs for the steps enabled by this preset. 
+  #  Some of them offer further configurable properties, while some of them might not be
+  #  of use for you so it might be better to not specify them.
+  #
+aiProcessPreset_TargetRealtime_Quality = ( \
+    aiProcess_CalcTangentSpace              |  \
+    aiProcess_GenSmoothNormals              |  \
+    aiProcess_JoinIdenticalVertices         |  \
+    aiProcess_ImproveCacheLocality          |  \
+    aiProcess_LimitBoneWeights              |  \
+    aiProcess_RemoveRedundantMaterials      |  \
+    aiProcess_SplitLargeMeshes              |  \
+    aiProcess_Triangulate                   |  \
+    aiProcess_GenUVCoords                   |  \
+    aiProcess_SortByPType                   |  \
+    aiProcess_FindDegenerates               |  \
+    aiProcess_FindInvalidData               |  \
+    0 )
+
+ ## @def aiProcessPreset_TargetRealtime_MaxQuality
+  #  @brief Default postprocess configuration optimizing the data for real-time rendering.
+  #
+  #  This preset enables almost every optimization step to achieve perfectly
+  #  optimized data. It's your choice for level editor environments where import speed 
+  #  is not important.
+  #  
+  #  If you're using DirectX, don't forget to combine this value with
+  #  the #aiProcess_ConvertToLeftHanded step. If you don't support UV transformations
+  #  in your application, apply the #aiProcess_TransformUVCoords step, too.
+  #  @note Please take the time to read the docs for the steps enabled by this preset. 
+  #  Some of them offer further configurable properties, while some of them might not be
+  #  of use for you so it might be better to not specify them.
+  #
+aiProcessPreset_TargetRealtime_MaxQuality = ( \
+    aiProcessPreset_TargetRealtime_Quality   |  \
+    aiProcess_FindInstances                  |  \
+    aiProcess_ValidateDataStructure          |  \
+    aiProcess_OptimizeMeshes                 |  \
+    0 )
+
+
diff --git a/libs/assimp/port/PyAssimp/pyassimp/structs.py b/libs/assimp/port/PyAssimp/pyassimp/structs.py
new file mode 100644
index 0000000..e1fba19
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/pyassimp/structs.py
@@ -0,0 +1,1135 @@
+#-*- coding: utf-8 -*-
+
+from ctypes import POINTER, c_void_p, c_uint, c_char, c_float, Structure, c_double, c_ubyte, c_size_t, c_uint32
+
+
+class Vector2D(Structure):
+    """
+    See 'vector2.h' for details.
+    """
+
+
+    _fields_ = [
+            ("x", c_float),("y", c_float),
+        ]
+
+class Matrix3x3(Structure):
+    """
+    See 'matrix3x3.h' for details.
+    """
+
+
+    _fields_ = [
+            ("a1", c_float),("a2", c_float),("a3", c_float),
+            ("b1", c_float),("b2", c_float),("b3", c_float),
+            ("c1", c_float),("c2", c_float),("c3", c_float),
+        ]
+
+class Texel(Structure):
+    """
+    See 'texture.h' for details.
+    """
+
+    _fields_ = [
+            ("b", c_ubyte),("g", c_ubyte),("r", c_ubyte),("a", c_ubyte),
+        ]
+
+class Color4D(Structure):
+    """
+    See 'color4.h' for details.
+    """
+
+
+    _fields_ = [
+            #  Red, green, blue and alpha color values
+            ("r", c_float),("g", c_float),("b", c_float),("a", c_float),
+        ]
+
+class Plane(Structure):
+    """
+    See 'types.h' for details.
+    """
+
+    _fields_ = [
+            #  Plane equation
+            ("a", c_float),("b", c_float),("c", c_float),("d", c_float),
+        ]
+
+class Color3D(Structure):
+    """
+    See 'types.h' for details.
+    """
+
+    _fields_ = [
+            #  Red, green and blue color values
+            ("r", c_float),("g", c_float),("b", c_float),
+        ]
+
+class String(Structure):
+    """
+    See 'types.h' for details.
+    """
+
+    MAXLEN = 1024
+
+    _fields_ = [
+            # Binary length of the string excluding the terminal 0. This is NOT the
+            #  logical length of strings containing UTF-8 multibyte sequences! It's
+            #  the number of bytes from the beginning of the string to its end.
+            ("length", c_uint32),
+
+            # String buffer. Size limit is MAXLEN
+            ("data", c_char*MAXLEN),
+        ]
+
+class MaterialPropertyString(Structure):
+    """
+    See 'MaterialSystem.cpp' for details.
+
+    The size of length is truncated to 4 bytes on 64-bit platforms when used as a
+    material property (see MaterialSystem.cpp aiMaterial::AddProperty() for details).
+    """
+
+    MAXLEN = 1024
+
+    _fields_ = [
+            # Binary length of the string excluding the terminal 0. This is NOT the
+            #  logical length of strings containing UTF-8 multibyte sequences! It's
+            #  the number of bytes from the beginning of the string to its end.
+            ("length", c_uint32),
+
+            # String buffer. Size limit is MAXLEN
+            ("data", c_char*MAXLEN),
+        ]
+
+class MemoryInfo(Structure):
+    """
+    See 'types.h' for details.
+    """
+
+    _fields_ = [
+            # Storage allocated for texture data
+            ("textures", c_uint),
+
+            # Storage allocated for material data
+            ("materials", c_uint),
+
+            # Storage allocated for mesh data
+            ("meshes", c_uint),
+
+            # Storage allocated for node data
+            ("nodes", c_uint),
+
+            # Storage allocated for animation data
+            ("animations", c_uint),
+
+            # Storage allocated for camera data
+            ("cameras", c_uint),
+
+            # Storage allocated for light data
+            ("lights", c_uint),
+
+            # Total storage allocated for the full import.
+            ("total", c_uint),
+        ]
+
+class Quaternion(Structure):
+    """
+    See 'quaternion.h' for details.
+    """
+
+
+    _fields_ = [
+            #  w,x,y,z components of the quaternion
+            ("w", c_float),("x", c_float),("y", c_float),("z", c_float),
+        ]
+
+class Face(Structure):
+    """
+    See 'mesh.h' for details.
+    """
+
+    _fields_ = [
+            #  Number of indices defining this face.
+            #  The maximum value for this member is
+            #AI_MAX_FACE_INDICES.
+            ("mNumIndices", c_uint),
+
+            #  Pointer to the indices array. Size of the array is given in numIndices.
+            ("mIndices", POINTER(c_uint)),
+        ]
+
+class VertexWeight(Structure):
+    """
+    See 'mesh.h' for details.
+    """
+
+    _fields_ = [
+            #  Index of the vertex which is influenced by the bone.
+            ("mVertexId", c_uint),
+
+            #  The strength of the influence in the range (0...1).
+            #  The influence from all bones at one vertex amounts to 1.
+            ("mWeight", c_float),
+        ]
+
+class Matrix4x4(Structure):
+    """
+    See 'matrix4x4.h' for details.
+    """
+
+
+    _fields_ = [
+            ("a1", c_float),("a2", c_float),("a3", c_float),("a4", c_float),
+            ("b1", c_float),("b2", c_float),("b3", c_float),("b4", c_float),
+            ("c1", c_float),("c2", c_float),("c3", c_float),("c4", c_float),
+            ("d1", c_float),("d2", c_float),("d3", c_float),("d4", c_float),
+        ]
+
+class Vector3D(Structure):
+    """
+    See 'vector3.h' for details.
+    """
+
+
+    _fields_ = [
+            ("x", c_float),("y", c_float),("z", c_float),
+        ]
+
+class MeshKey(Structure):
+    """
+    See 'anim.h' for details.
+    """
+
+    _fields_ = [
+            # The time of this key
+            ("mTime", c_double),
+
+            # Index into the aiMesh::mAnimMeshes array of the
+            #  mesh corresponding to the
+            #aiMeshAnim hosting this
+            #  key frame. The referenced anim mesh is evaluated
+            #  according to the rules defined in the docs for
+            #aiAnimMesh.
+            ("mValue", c_uint),
+        ]
+
+class MetadataEntry(Structure):
+    """
+    See 'metadata.h' for details
+    """
+    AI_BOOL       = 0
+    AI_INT32      = 1
+    AI_UINT64     = 2
+    AI_FLOAT      = 3
+    AI_DOUBLE     = 4
+    AI_AISTRING   = 5
+    AI_AIVECTOR3D = 6
+    AI_META_MAX   = 7
+    _fields_ = [
+            # The type field uniquely identifies the underlying type of the data field
+            ("mType", c_uint),
+            ("mData", c_void_p),
+    ]
+
+class Metadata(Structure):
+    """
+    See 'metadata.h' for details
+    """
+    _fields_ = [
+            # Length of the mKeys and mValues arrays, respectively
+            ("mNumProperties", c_uint),
+
+            # Arrays of keys, may not be NULL. Entries in this array may not be NULL
+            # as well.
+            ("mKeys", POINTER(String)),
+
+            # Arrays of values, may not be NULL. Entries in this array may be NULL
+            # if the corresponding property key has no assigned value.
+            ("mValues", POINTER(MetadataEntry)),
+    ]
+
+class Node(Structure):
+    """
+    See 'scene.h' for details.
+    """
+
+
+Node._fields_ = [
+            # The name of the node.
+            # The name might be empty (length of zero) but all nodes which
+            # need to be accessed afterwards by bones or anims are usually named.
+            # Multiple nodes may have the same name, but nodes which are accessed
+            # by bones (see
+            #aiBone and
+            #aiMesh::mBones) *must* be unique.
+            # Cameras and lights are assigned to a specific node name - if there
+            # are multiple nodes with this name, they're assigned to each of them.
+            # <br>
+            # There are no limitations regarding the characters contained in
+            # this text. You should be able to handle stuff like whitespace, tabs,
+            # linefeeds, quotation marks, ampersands, ... .
+            ("mName", String),
+
+            # The transformation relative to the node's parent.
+            ("mTransformation", Matrix4x4),
+
+            # Parent node. NULL if this node is the root node.
+            ("mParent", POINTER(Node)),
+
+            # The number of child nodes of this node.
+            ("mNumChildren", c_uint),
+
+            # The child nodes of this node. NULL if mNumChildren is 0.
+            ("mChildren", POINTER(POINTER(Node))),
+
+            # The number of meshes of this node.
+            ("mNumMeshes", c_uint),
+
+            # The meshes of this node. Each entry is an index into the mesh
+            ("mMeshes", POINTER(c_uint)),
+
+            # Metadata associated with this node or NULL if there is no metadata.
+            # Whether any metadata is generated depends on the source file format.
+            ("mMetadata", POINTER(Metadata)),
+        ]
+
+class Light(Structure):
+    """
+    See 'light.h' for details.
+    """
+
+
+    _fields_ = [
+            # The name of the light source.
+            #  There must be a node in the scenegraph with the same name.
+            #  This node specifies the position of the light in the scene
+            #  hierarchy and can be animated.
+            ("mName", String),
+
+            # The type of the light source.
+            # aiLightSource_UNDEFINED is not a valid value for this member.
+            ("mType", c_uint),
+
+            # Position of the light source in space. Relative to the
+            #  transformation of the node corresponding to the light.
+            #  The position is undefined for directional lights.
+            ("mPosition", Vector3D),
+
+            # Direction of the light source in space. Relative to the
+            #  transformation of the node corresponding to the light.
+            #  The direction is undefined for point lights. The vector
+            #  may be normalized, but it needn't.
+            ("mDirection", Vector3D),
+
+            # Up direction of the light source in space. Relative to the
+            #  transformation of the node corresponding to the light.
+            #
+            # The direction is undefined for point lights. The vector
+            #  may be normalized, but it needn't.
+            ("mUp", Vector3D),
+
+            # Constant light attenuation factor.
+            #  The intensity of the light source at a given distance 'd' from
+            #  the light's position is
+            #  @code
+            #  Atten = 1/( att0 + att1
+            # d + att2
+            # d*d)
+            #  @endcode
+            #  This member corresponds to the att0 variable in the equation.
+            #  Naturally undefined for directional lights.
+            ("mAttenuationConstant", c_float),
+
+            # Linear light attenuation factor.
+            #  The intensity of the light source at a given distance 'd' from
+            #  the light's position is
+            #  @code
+            #  Atten = 1/( att0 + att1
+            # d + att2
+            # d*d)
+            #  @endcode
+            #  This member corresponds to the att1 variable in the equation.
+            #  Naturally undefined for directional lights.
+            ("mAttenuationLinear", c_float),
+
+            # Quadratic light attenuation factor.
+            #  The intensity of the light source at a given distance 'd' from
+            #  the light's position is
+            #  @code
+            #  Atten = 1/( att0 + att1
+            # d + att2
+            # d*d)
+            #  @endcode
+            #  This member corresponds to the att2 variable in the equation.
+            #  Naturally undefined for directional lights.
+            ("mAttenuationQuadratic", c_float),
+
+            # Diffuse color of the light source
+            #  The diffuse light color is multiplied with the diffuse
+            #  material color to obtain the final color that contributes
+            #  to the diffuse shading term.
+            ("mColorDiffuse", Color3D),
+
+            # Specular color of the light source
+            #  The specular light color is multiplied with the specular
+            #  material color to obtain the final color that contributes
+            #  to the specular shading term.
+            ("mColorSpecular", Color3D),
+
+            # Ambient color of the light source
+            #  The ambient light color is multiplied with the ambient
+            #  material color to obtain the final color that contributes
+            #  to the ambient shading term. Most renderers will ignore
+            #  this value it, is just a remaining of the fixed-function pipeline
+            #  that is still supported by quite many file formats.
+            ("mColorAmbient", Color3D),
+
+            # Inner angle of a spot light's light cone.
+            #  The spot light has maximum influence on objects inside this
+            #  angle. The angle is given in radians. It is 2PI for point
+            #  lights and undefined for directional lights.
+            ("mAngleInnerCone", c_float),
+
+            # Outer angle of a spot light's light cone.
+            #  The spot light does not affect objects outside this angle.
+            #  The angle is given in radians. It is 2PI for point lights and
+            #  undefined for directional lights. The outer angle must be
+            #  greater than or equal to the inner angle.
+            #  It is assumed that the application uses a smooth
+            #  interpolation between the inner and the outer cone of the
+            #  spot light.
+            ("mAngleOuterCone", c_float),
+
+            # Size of area light source.
+            ("mSize", Vector2D),
+        ]
+
+class Texture(Structure):
+    """
+    See 'texture.h' for details.
+    """
+
+
+    _fields_ = [
+            # Width of the texture, in pixels
+            # If mHeight is zero the texture is compressed in a format
+            # like JPEG. In this case mWidth specifies the size of the
+            # memory area pcData is pointing to, in bytes.
+            ("mWidth", c_uint),
+
+            # Height of the texture, in pixels
+            # If this value is zero, pcData points to an compressed texture
+            # in any format (e.g. JPEG).
+            ("mHeight", c_uint),
+
+            # A hint from the loader to make it easier for applications
+            # to determine the type of embedded textures.
+            #
+            # If mHeight != 0 this member is show how data is packed. Hint will consist of
+            # two parts: channel order and channel bitness (count of the bits for every
+            # color channel). For simple parsing by the viewer it's better to not omit
+            # absent color channel and just use 0 for bitness. For example:
+            # 1. Image contain RGBA and 8 bit per channel, achFormatHint == "rgba8888";
+            # 2. Image contain ARGB and 8 bit per channel, achFormatHint == "argb8888";
+            # 3. Image contain RGB and 5 bit for R and B channels and 6 bit for G channel,
+            #    achFormatHint == "rgba5650";
+            # 4. One color image with B channel and 1 bit for it, achFormatHint == "rgba0010";
+            # If mHeight == 0 then achFormatHint is set set to '\\0\\0\\0\\0' if the loader has no additional
+            # information about the texture file format used OR the
+            # file extension of the format without a trailing dot. If there
+            # are multiple file extensions for a format, the shortest
+            # extension is chosen (JPEG maps to 'jpg', not to 'jpeg').
+            # E.g. 'dds\\0', 'pcx\\0', 'jpg\\0'.  All characters are lower-case.
+            # The fourth character will always be '\\0'.
+            ("achFormatHint", c_char*9),
+
+            # Data of the texture.
+            # Points to an array of mWidth
+            # mHeight aiTexel's.
+            # The format of the texture data is always ARGB8888 to
+            # make the implementation for user of the library as easy
+            # as possible. If mHeight = 0 this is a pointer to a memory
+            # buffer of size mWidth containing the compressed texture
+            # data. Good luck, have fun!
+            ("pcData", POINTER(Texel)),
+
+            # Texture original filename
+            # Used to get the texture reference
+            ("mFilename", String),
+        ]
+
+class Ray(Structure):
+    """
+    See 'types.h' for details.
+    """
+
+    _fields_ = [
+            #  Position and direction of the ray
+            ("pos", Vector3D),("dir", Vector3D),
+        ]
+
+class UVTransform(Structure):
+    """
+    See 'material.h' for details.
+    """
+
+    _fields_ = [
+            # Translation on the u and v axes.
+            #  The default value is (0|0).
+            ("mTranslation", Vector2D),
+
+            # Scaling on the u and v axes.
+            #  The default value is (1|1).
+            ("mScaling", Vector2D),
+
+            # Rotation - in counter-clockwise direction.
+            #  The rotation angle is specified in radians. The
+            #  rotation center is 0.5f|0.5f. The default value
+            #  0.f.
+            ("mRotation", c_float),
+        ]
+
+class MaterialProperty(Structure):
+    """
+    See 'material.h' for details.
+    """
+
+    _fields_ = [
+            # Specifies the name of the property (key)
+            #  Keys are generally case insensitive.
+            ("mKey", String),
+
+            # Textures: Specifies their exact usage semantic.
+            # For non-texture properties, this member is always 0
+            # (or, better-said,
+            #aiTextureType_NONE).
+            ("mSemantic", c_uint),
+
+            # Textures: Specifies the index of the texture.
+            #  For non-texture properties, this member is always 0.
+            ("mIndex", c_uint),
+
+            # Size of the buffer mData is pointing to, in bytes.
+            #  This value may not be 0.
+            ("mDataLength", c_uint),
+
+            # Type information for the property.
+            # Defines the data layout inside the data buffer. This is used
+            # by the library internally to perform debug checks and to
+            # utilize proper type conversions.
+            # (It's probably a hacky solution, but it works.)
+            ("mType", c_uint),
+
+            # Binary buffer to hold the property's value.
+            # The size of the buffer is always mDataLength.
+            ("mData", POINTER(c_char)),
+        ]
+
+class Material(Structure):
+    """
+    See 'material.h' for details.
+    """
+
+    _fields_ = [
+            # List of all material properties loaded.
+            ("mProperties", POINTER(POINTER(MaterialProperty))),
+
+            # Number of properties in the data base
+            ("mNumProperties", c_uint),
+
+            # Storage allocated
+            ("mNumAllocated", c_uint),
+        ]
+
+class Bone(Structure):
+    """
+    See 'mesh.h' for details.
+    """
+
+    _fields_ = [
+            #  The name of the bone.
+            ("mName", String),
+
+            #  The number of vertices affected by this bone
+            #  The maximum value for this member is
+            #AI_MAX_BONE_WEIGHTS.
+            ("mNumWeights", c_uint),
+
+            #  The vertices affected by this bone
+            ("mWeights", POINTER(VertexWeight)),
+
+            #  Matrix that transforms from mesh space to bone space in bind pose
+            ("mOffsetMatrix", Matrix4x4),
+        ]
+
+
+class AnimMesh(Structure):
+    """
+    See 'mesh.h' for details.
+    """
+
+    AI_MAX_NUMBER_OF_TEXTURECOORDS = 0x8
+    AI_MAX_NUMBER_OF_COLOR_SETS = 0x8
+
+    _fields_ = [
+            #  Anim Mesh name
+            ("mName", String),
+
+            # Replacement for aiMesh::mVertices. If this array is non-NULL,
+            # it *must* contain mNumVertices entries. The corresponding
+            # array in the host mesh must be non-NULL as well - animation
+            # meshes may neither add or nor remove vertex components (if
+            # a replacement array is NULL and the corresponding source
+            # array is not, the source data is taken instead)
+            ("mVertices", POINTER(Vector3D)),
+
+            # Replacement for aiMesh::mNormals.
+            ("mNormals", POINTER(Vector3D)),
+
+            # Replacement for aiMesh::mTangents.
+            ("mTangents", POINTER(Vector3D)),
+
+            # Replacement for aiMesh::mBitangents.
+            ("mBitangents", POINTER(Vector3D)),
+
+            # Replacement for aiMesh::mColors
+            ("mColors", POINTER(Color4D) * AI_MAX_NUMBER_OF_COLOR_SETS),
+
+            # Replacement for aiMesh::mTextureCoords
+            ("mTextureCoords", POINTER(Vector3D) * AI_MAX_NUMBER_OF_TEXTURECOORDS),
+
+            # The number of vertices in the aiAnimMesh, and thus the length of all
+            # the member arrays.
+            #
+            # This has always the same value as the mNumVertices property in the
+            # corresponding aiMesh. It is duplicated here merely to make the length
+            # of the member arrays accessible even if the aiMesh is not known, e.g.
+            # from language bindings.
+            ("mNumVertices", c_uint),
+
+            # Weight of the AnimMesh.
+            ("mWeight", c_float),
+        ]
+
+
+class Mesh(Structure):
+    """
+    See 'mesh.h' for details.
+    """
+
+    AI_MAX_FACE_INDICES = 0x7fff
+    AI_MAX_BONE_WEIGHTS = 0x7fffffff
+    AI_MAX_VERTICES = 0x7fffffff
+    AI_MAX_FACES = 0x7fffffff
+    AI_MAX_NUMBER_OF_COLOR_SETS = 0x8
+    AI_MAX_NUMBER_OF_TEXTURECOORDS = 0x8
+
+    _fields_ = [ # Bitwise combination of the members of the
+            #aiPrimitiveType enum.
+            # This specifies which types of primitives are present in the mesh.
+            # The "SortByPrimitiveType"-Step can be used to make sure the
+            # output meshes consist of one primitive type each.
+            ("mPrimitiveTypes", c_uint),
+
+            # The number of vertices in this mesh.
+            # This is also the size of all of the per-vertex data arrays.
+            # The maximum value for this member is
+            #AI_MAX_VERTICES.
+            ("mNumVertices", c_uint),
+
+            # The number of primitives (triangles, polygons, lines) in this  mesh.
+            # This is also the size of the mFaces array.
+            # The maximum value for this member is
+            #AI_MAX_FACES.
+            ("mNumFaces", c_uint),
+
+            # Vertex positions.
+            # This array is always present in a mesh. The array is
+            # mNumVertices in size.
+            ("mVertices", POINTER(Vector3D)),
+
+            # Vertex normals.
+            # The array contains normalized vectors, NULL if not present.
+            # The array is mNumVertices in size. Normals are undefined for
+            # point and line primitives. A mesh consisting of points and
+            # lines only may not have normal vectors. Meshes with mixed
+            # primitive types (i.e. lines and triangles) may have normals,
+            # but the normals for vertices that are only referenced by
+            # point or line primitives are undefined and set to QNaN (WARN:
+            # qNaN compares to inequal to *everything*, even to qNaN itself.
+            # Using code like this to check whether a field is qnan is:
+            # @code
+            #define IS_QNAN(f) (f != f)
+            # @endcode
+            # still dangerous because even 1.f == 1.f could evaluate to false! (
+            # remember the subtleties of IEEE754 artithmetics). Use stuff like
+            # @c fpclassify instead.
+            # @note Normal vectors computed by Assimp are always unit-length.
+            # However, this needn't apply for normals that have been taken
+            #   directly from the model file.
+            ("mNormals", POINTER(Vector3D)),
+
+            # Vertex tangents.
+            # The tangent of a vertex points in the direction of the positive
+            # X texture axis. The array contains normalized vectors, NULL if
+            # not present. The array is mNumVertices in size. A mesh consisting
+            # of points and lines only may not have normal vectors. Meshes with
+            # mixed primitive types (i.e. lines and triangles) may have
+            # normals, but the normals for vertices that are only referenced by
+            # point or line primitives are undefined and set to qNaN.  See
+            # the
+            #mNormals member for a detailed discussion of qNaNs.
+            # @note If the mesh contains tangents, it automatically also
+            # contains bitangents (the bitangent is just the cross product of
+            # tangent and normal vectors).
+            ("mTangents", POINTER(Vector3D)),
+
+            # Vertex bitangents.
+            # The bitangent of a vertex points in the direction of the positive
+            # Y texture axis. The array contains normalized vectors, NULL if not
+            # present. The array is mNumVertices in size.
+            # @note If the mesh contains tangents, it automatically also contains
+            # bitangents.
+            ("mBitangents", POINTER(Vector3D)),
+
+            # Vertex color sets.
+            # A mesh may contain 0 to
+            #AI_MAX_NUMBER_OF_COLOR_SETS vertex
+            # colors per vertex. NULL if not present. Each array is
+            # mNumVertices in size if present.
+            ("mColors", POINTER(Color4D)*AI_MAX_NUMBER_OF_COLOR_SETS),
+
+            # Vertex texture coords, also known as UV channels.
+            # A mesh may contain 0 to AI_MAX_NUMBER_OF_TEXTURECOORDS per
+            # vertex. NULL if not present. The array is mNumVertices in size.
+            ("mTextureCoords", POINTER(Vector3D)*AI_MAX_NUMBER_OF_TEXTURECOORDS),
+
+            # Specifies the number of components for a given UV channel.
+            # Up to three channels are supported (UVW, for accessing volume
+            # or cube maps). If the value is 2 for a given channel n, the
+            # component p.z of mTextureCoords[n][p] is set to 0.0f.
+            # If the value is 1 for a given channel, p.y is set to 0.0f, too.
+            # @note 4D coords are not supported
+            ("mNumUVComponents", c_uint*AI_MAX_NUMBER_OF_TEXTURECOORDS),
+
+            # The faces the mesh is constructed from.
+            # Each face refers to a number of vertices by their indices.
+            # This array is always present in a mesh, its size is given
+            # in mNumFaces. If the
+            #AI_SCENE_FLAGS_NON_VERBOSE_FORMAT
+            # is NOT set each face references an unique set of vertices.
+            ("mFaces", POINTER(Face)),
+
+            # The number of bones this mesh contains.
+            # Can be 0, in which case the mBones array is NULL.
+            ("mNumBones", c_uint),
+
+            # The bones of this mesh.
+            # A bone consists of a name by which it can be found in the
+            # frame hierarchy and a set of vertex weights.
+            ("mBones", POINTER(POINTER(Bone))),
+
+            # The material used by this mesh.
+            # A mesh does use only a single material. If an imported model uses
+            # multiple materials, the import splits up the mesh. Use this value
+            # as index into the scene's material list.
+            ("mMaterialIndex", c_uint),
+
+            # Name of the mesh. Meshes can be named, but this is not a
+            #  requirement and leaving this field empty is totally fine.
+            #  There are mainly three uses for mesh names:
+            #   - some formats name nodes and meshes independently.
+            #   - importers tend to split meshes up to meet the
+            #      one-material-per-mesh requirement. Assigning
+            #      the same (dummy) name to each of the result meshes
+            #      aids the caller at recovering the original mesh
+            #      partitioning.
+            #   - Vertex animations refer to meshes by their names.
+            ("mName", String),
+
+            # The number of attachment meshes. Note! Currently only works with Collada loader.
+            ("mNumAnimMeshes", c_uint),
+
+            # Attachment meshes for this mesh, for vertex-based animation.
+            # Attachment meshes carry replacement data for some of the
+            # mesh'es vertex components (usually positions, normals).
+            # Note! Currently only works with Collada loader.
+            ("mAnimMeshes", POINTER(POINTER(AnimMesh))),
+
+            # Method of morphing when animeshes are specified.
+            ("mMethod", c_uint),
+
+        ]
+
+class Camera(Structure):
+    """
+    See 'camera.h' for details.
+    """
+
+
+    _fields_ = [
+            # The name of the camera.
+            #  There must be a node in the scenegraph with the same name.
+            #  This node specifies the position of the camera in the scene
+            #  hierarchy and can be animated.
+            ("mName", String),
+
+            # Position of the camera relative to the coordinate space
+            #  defined by the corresponding node.
+            #  The default value is 0|0|0.
+            ("mPosition", Vector3D),
+
+            # 'Up' - vector of the camera coordinate system relative to
+            #  the coordinate space defined by the corresponding node.
+            #  The 'right' vector of the camera coordinate system is
+            #  the cross product of  the up and lookAt vectors.
+            #  The default value is 0|1|0. The vector
+            #  may be normalized, but it needn't.
+            ("mUp", Vector3D),
+
+            # 'LookAt' - vector of the camera coordinate system relative to
+            #  the coordinate space defined by the corresponding node.
+            #  This is the viewing direction of the user.
+            #  The default value is 0|0|1. The vector
+            #  may be normalized, but it needn't.
+            ("mLookAt", Vector3D),
+
+            # Half horizontal field of view angle, in radians.
+            #  The field of view angle is the angle between the center
+            #  line of the screen and the left or right border.
+            #  The default value is 1/4PI.
+            ("mHorizontalFOV", c_float),
+
+            # Distance of the near clipping plane from the camera.
+            # The value may not be 0.f (for arithmetic reasons to prevent
+            # a division through zero). The default value is 0.1f.
+            ("mClipPlaneNear", c_float),
+
+            # Distance of the far clipping plane from the camera.
+            # The far clipping plane must, of course, be further away than the
+            # near clipping plane. The default value is 1000.f. The ratio
+            # between the near and the far plane should not be too
+            # large (between 1000-10000 should be ok) to avoid floating-point
+            # inaccuracies which could lead to z-fighting.
+            ("mClipPlaneFar", c_float),
+
+            # Screen aspect ratio.
+            # This is the ration between the width and the height of the
+            # screen. Typical values are 4/3, 1/2 or 1/1. This value is
+            # 0 if the aspect ratio is not defined in the source file.
+            # 0 is also the default value.
+            ("mAspect", c_float),
+        ]
+
+class VectorKey(Structure):
+    """
+    See 'anim.h' for details.
+    """
+
+    _fields_ = [
+            # The time of this key
+            ("mTime", c_double),
+
+            # The value of this key
+            ("mValue", Vector3D),
+        ]
+
+class QuatKey(Structure):
+    """
+    See 'anim.h' for details.
+    """
+
+    _fields_ = [
+            # The time of this key
+            ("mTime", c_double),
+
+            # The value of this key
+            ("mValue", Quaternion),
+        ]
+
+class MeshMorphKey(Structure):
+    """
+    See 'anim.h' for details.
+    """
+
+    _fields_ = [
+            # The time of this key
+            ("mTime", c_double),
+
+            # The values and weights at the time of this key
+            ("mValues", POINTER(c_uint)),
+            ("mWeights", POINTER(c_double)),
+
+            # The number of values and weights
+            ("mNumValuesAndWeights", c_uint),
+
+        ]
+
+class NodeAnim(Structure):
+    """
+    See 'anim.h' for details.
+    """
+
+    _fields_ = [
+            # The name of the node affected by this animation. The node
+            #  must exist and it must be unique.
+            ("mNodeName", String),
+
+            # The number of position keys
+            ("mNumPositionKeys", c_uint),
+
+            # The position keys of this animation channel. Positions are
+            # specified as 3D vector. The array is mNumPositionKeys in size.
+            # If there are position keys, there will also be at least one
+            # scaling and one rotation key.
+            ("mPositionKeys", POINTER(VectorKey)),
+
+            # The number of rotation keys
+            ("mNumRotationKeys", c_uint),
+
+            # The rotation keys of this animation channel. Rotations are
+            #  given as quaternions,  which are 4D vectors. The array is
+            #  mNumRotationKeys in size.
+            # If there are rotation keys, there will also be at least one
+            # scaling and one position key.
+            ("mRotationKeys", POINTER(QuatKey)),
+
+            # The number of scaling keys
+            ("mNumScalingKeys", c_uint),
+
+            # The scaling keys of this animation channel. Scalings are
+            #  specified as 3D vector. The array is mNumScalingKeys in size.
+            # If there are scaling keys, there will also be at least one
+            # position and one rotation key.
+            ("mScalingKeys", POINTER(VectorKey)),
+
+            # Defines how the animation behaves before the first
+            #  key is encountered.
+            #  The default value is aiAnimBehaviour_DEFAULT (the original
+            #  transformation matrix of the affected node is used).
+            ("mPreState", c_uint),
+
+            # Defines how the animation behaves after the last
+            #  key was processed.
+            #  The default value is aiAnimBehaviour_DEFAULT (the original
+            #  transformation matrix of the affected node is taken).
+            ("mPostState", c_uint),
+        ]
+
+class MeshAnim(Structure):
+    """
+    See 'anim.h' for details.
+    """
+
+    _fields_ = [
+            # Name of the mesh to be animated. An empty string is not allowed,
+            #  animated meshes need to be named (not necessarily uniquely,
+            #  the name can basically serve as wild-card to select a group
+            #  of meshes with similar animation setup)
+            ("mName", String),
+
+            # Size of the #mKeys array. Must be 1, at least.
+            ("mNumKeys", c_uint),
+
+            # Key frames of the animation. May not be NULL.
+            ("mKeys", POINTER(MeshKey)),
+        ]
+
+class MeshMorphAnim(Structure):
+    """
+    See 'anim.h' for details.
+    """
+
+    _fields_ = [
+            # Name of the mesh to be animated. An empty string is not allowed,
+            # animated meshes need to be named (not necessarily uniquely,
+            # the name can basically serve as wildcard to select a group
+            # of meshes with similar animation setup)
+            ("mName", String),
+
+            # Size of the #mKeys array. Must be 1, at least.
+            ("mNumKeys", c_uint),
+
+            # Key frames of the animation. May not be NULL.
+            ("mKeys", POINTER(MeshMorphKey)),
+        ]
+
+
+class Animation(Structure):
+    """
+    See 'anim.h' for details.
+    """
+
+    _fields_ = [
+            # The name of the animation. If the modeling package this data was
+            #  exported from does support only a single animation channel, this
+            #  name is usually empty (length is zero).
+            ("mName", String),
+
+            # Duration of the animation in ticks.
+            ("mDuration", c_double),
+
+            # Ticks per second. 0 if not specified in the imported file
+            ("mTicksPerSecond", c_double),
+
+            # The number of bone animation channels. Each channel affects
+            #  a single node.
+            ("mNumChannels", c_uint),
+
+            # The node animation channels. Each channel affects a single node.
+            #  The array is mNumChannels in size.
+            ("mChannels", POINTER(POINTER(NodeAnim))),
+
+            # The number of mesh animation channels. Each channel affects
+            #  a single mesh and defines vertex-based animation.
+            ("mNumMeshChannels", c_uint),
+
+            # The mesh animation channels. Each channel affects a single mesh.
+            #  The array is mNumMeshChannels in size.
+            ("mMeshChannels", POINTER(POINTER(MeshAnim))),
+
+            # The number of mesh animation channels. Each channel affects
+            # a single mesh and defines morphing animation.
+            ("mNumMorphMeshChannels", c_uint),
+
+            # The morph mesh animation channels. Each channel affects a single mesh.
+            # The array is mNumMorphMeshChannels in size.
+            ("mMorphMeshChannels", POINTER(POINTER(MeshMorphAnim))),
+
+        ]
+
+class ExportDataBlob(Structure):
+    """
+    See 'cexport.h' for details.
+
+    Note that the '_fields_' definition is outside the class to allow the 'next' field to be recursive
+    """
+    pass
+
+ExportDataBlob._fields_ = [
+            # Size of the data in bytes
+            ("size", c_size_t),
+
+            # The data.
+            ("data", c_void_p),
+
+            # Name of the blob. An empty string always
+            # indicates the first (and primary) blob,
+            # which contains the actual file data.
+            # Any other blobs are auxiliary files produced
+            # by exporters (i.e. material files). Existence
+            # of such files depends on the file format. Most
+            # formats don't split assets across multiple files.
+            #
+            # If used, blob names usually contain the file
+            # extension that should be used when writing
+            # the data to disc.
+            ("name", String),
+
+            # Pointer to the next blob in the chain or NULL if there is none.
+            ("next", POINTER(ExportDataBlob)),
+        ]
+
+
+class Scene(Structure):
+    """
+    See 'aiScene.h' for details.
+    """
+
+    AI_SCENE_FLAGS_INCOMPLETE = 0x1
+    AI_SCENE_FLAGS_VALIDATED = 0x2
+    AI_SCENE_FLAGS_VALIDATION_WARNING =  	0x4
+    AI_SCENE_FLAGS_NON_VERBOSE_FORMAT =  	0x8
+    AI_SCENE_FLAGS_TERRAIN = 0x10
+    AI_SCENE_FLAGS_ALLOW_SHARED = 0x20
+
+    _fields_ = [
+            # Any combination of the AI_SCENE_FLAGS_XXX flags. By default
+            # this value is 0, no flags are set. Most applications will
+            # want to reject all scenes with the AI_SCENE_FLAGS_INCOMPLETE
+            # bit set.
+            ("mFlags", c_uint),
+
+            # The root node of the hierarchy.
+            # There will always be at least the root node if the import
+            # was successful (and no special flags have been set).
+            # Presence of further nodes depends on the format and content
+            # of the imported file.
+            ("mRootNode", POINTER(Node)),
+
+            # The number of meshes in the scene.
+            ("mNumMeshes", c_uint),
+
+            # The array of meshes.
+            # Use the indices given in the aiNode structure to access
+            # this array. The array is mNumMeshes in size. If the
+            # AI_SCENE_FLAGS_INCOMPLETE flag is not set there will always
+            # be at least ONE material.
+            ("mMeshes", POINTER(POINTER(Mesh))),
+
+            # The number of materials in the scene.
+            ("mNumMaterials", c_uint),
+
+            # The array of materials.
+            # Use the index given in each aiMesh structure to access this
+            # array. The array is mNumMaterials in size. If the
+            # AI_SCENE_FLAGS_INCOMPLETE flag is not set there will always
+            # be at least ONE material.
+            ("mMaterials", POINTER(POINTER(Material))),
+
+            # The number of animations in the scene.
+            ("mNumAnimations", c_uint),
+
+            # The array of animations.
+            # All animations imported from the given file are listed here.
+            # The array is mNumAnimations in size.
+            ("mAnimations", POINTER(POINTER(Animation))),
+
+            # The number of textures embedded into the file
+            ("mNumTextures", c_uint),
+
+            # The array of embedded textures.
+            # Not many file formats embed their textures into the file.
+            # An example is Quake's MDL format (which is also used by
+            # some GameStudio versions)
+            ("mTextures", POINTER(POINTER(Texture))),
+
+            # The number of light sources in the scene. Light sources
+            # are fully optional, in most cases this attribute will be 0
+            ("mNumLights", c_uint),
+
+            # The array of light sources.
+            # All light sources imported from the given file are
+            # listed here. The array is mNumLights in size.
+            ("mLights", POINTER(POINTER(Light))),
+
+            # The number of cameras in the scene. Cameras
+            # are fully optional, in most cases this attribute will be 0
+            ("mNumCameras", c_uint),
+
+            # The array of cameras.
+            # All cameras imported from the given file are listed here.
+            # The array is mNumCameras in size. The first camera in the
+            # array (if existing) is the default camera view into
+            # the scene.
+            ("mCameras", POINTER(POINTER(Camera))),
+
+            # This data contains global metadata which belongs to the scene like
+            # unit-conversions, versions, vendors or other model-specific data. This
+            # can be used to store format-specific metadata as well.
+            ("mMetadata", POINTER(Metadata)),
+
+            # Internal data, do not touch
+            ("mPrivate", POINTER(c_char)),
+        ]
+
+assimp_structs_as_tuple = (Matrix4x4,
+                           Matrix3x3,
+                           Vector2D,
+                           Vector3D,
+                           Color3D,
+                           Color4D,
+                           Quaternion,
+                           Plane,
+                           Texel)
diff --git a/libs/assimp/port/PyAssimp/scripts/3d_viewer.py b/libs/assimp/port/PyAssimp/scripts/3d_viewer.py
new file mode 100755
index 0000000..08a6266
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/scripts/3d_viewer.py
@@ -0,0 +1,1318 @@
+#!/usr/bin/env python
+# -*- coding: UTF-8 -*-
+
+""" This program loads a model with PyASSIMP, and display it.
+
+Based on:
+- pygame code from http://3dengine.org/Spectator_%28PyOpenGL%29
+- http://www.lighthouse3d.com/tutorials
+- http://www.songho.ca/opengl/gl_transform.html
+- http://code.activestate.com/recipes/325391/
+- ASSIMP's C++ SimpleOpenGL viewer
+
+Authors: Séverin Lemaignan, 2012-2016
+"""
+import sys
+import logging
+
+logger = logging.getLogger("pyassimp")
+gllogger = logging.getLogger("OpenGL")
+gllogger.setLevel(logging.WARNING)
+logging.basicConfig(level=logging.INFO)
+
+import OpenGL
+
+OpenGL.ERROR_CHECKING = False
+OpenGL.ERROR_LOGGING = False
+# OpenGL.ERROR_ON_COPY = True
+# OpenGL.FULL_LOGGING = True
+from OpenGL.GL import *
+from OpenGL.arrays import vbo
+from OpenGL.GL import shaders
+
+import pygame
+import pygame.font
+import pygame.image
+
+import math, random
+from numpy import linalg
+
+import pyassimp
+from pyassimp.postprocess import *
+from pyassimp.helper import *
+import transformations
+
+ROTATION_180_X = numpy.array([[1, 0, 0, 0], [0, -1, 0, 0], [0, 0, -1, 0], [0, 0, 0, 1]], dtype=numpy.float32)
+
+# rendering mode
+BASE = "BASE"
+COLORS = "COLORS"
+SILHOUETTE = "SILHOUETTE"
+HELPERS = "HELPERS"
+
+# Entities type
+ENTITY = "entity"
+CAMERA = "camera"
+MESH = "mesh"
+
+FLAT_VERTEX_SHADER_120 = """
+#version 120
+
+uniform mat4 u_viewProjectionMatrix;
+uniform mat4 u_modelMatrix;
+
+uniform vec4 u_materialDiffuse;
+
+attribute vec3 a_vertex;
+
+varying vec4 v_color;
+
+void main(void)
+{
+    v_color = u_materialDiffuse;
+    gl_Position = u_viewProjectionMatrix * u_modelMatrix * vec4(a_vertex, 1.0);
+}
+"""
+
+FLAT_VERTEX_SHADER_130 = """
+#version 130
+
+uniform mat4 u_viewProjectionMatrix;
+uniform mat4 u_modelMatrix;
+
+uniform vec4 u_materialDiffuse;
+
+in vec3 a_vertex;
+
+out vec4 v_color;
+
+void main(void)
+{
+    v_color = u_materialDiffuse;
+    gl_Position = u_viewProjectionMatrix * u_modelMatrix * vec4(a_vertex, 1.0);
+}
+"""
+
+BASIC_VERTEX_SHADER_120 = """
+#version 120
+
+uniform mat4 u_viewProjectionMatrix;
+uniform mat4 u_modelMatrix;
+uniform mat3 u_normalMatrix;
+uniform vec3 u_lightPos;
+
+uniform vec4 u_materialDiffuse;
+
+attribute vec3 a_vertex;
+attribute vec3 a_normal;
+
+varying vec4 v_color;
+
+void main(void)
+{
+    // Now the normal is in world space, as we pass the light in world space.
+    vec3 normal = u_normalMatrix * a_normal;
+
+    float dist = distance(a_vertex, u_lightPos);
+
+    // go to https://www.desmos.com/calculator/nmnaud1hrw to play with the parameters
+    // att is not used for now
+    float att=1.0/(1.0+0.8*dist*dist);
+
+    vec3 surf2light = normalize(u_lightPos - a_vertex);
+    vec3 norm = normalize(normal);
+    float dcont=max(0.0,dot(norm,surf2light));
+
+    float ambient = 0.3;
+    float intensity = dcont + 0.3 + ambient;
+
+    v_color = u_materialDiffuse  * intensity;
+
+    gl_Position = u_viewProjectionMatrix * u_modelMatrix * vec4(a_vertex, 1.0);
+}
+"""
+
+BASIC_VERTEX_SHADER_130 = """
+#version 130
+
+uniform mat4 u_viewProjectionMatrix;
+uniform mat4 u_modelMatrix;
+uniform mat3 u_normalMatrix;
+uniform vec3 u_lightPos;
+
+uniform vec4 u_materialDiffuse;
+
+in vec3 a_vertex;
+in vec3 a_normal;
+
+out vec4 v_color;
+
+void main(void)
+{
+    // Now the normal is in world space, as we pass the light in world space.
+    vec3 normal = u_normalMatrix * a_normal;
+
+    float dist = distance(a_vertex, u_lightPos);
+
+    // go to https://www.desmos.com/calculator/nmnaud1hrw to play with the parameters
+    // att is not used for now
+    float att=1.0/(1.0+0.8*dist*dist);
+
+    vec3 surf2light = normalize(u_lightPos - a_vertex);
+    vec3 norm = normalize(normal);
+    float dcont=max(0.0,dot(norm,surf2light));
+
+    float ambient = 0.3;
+    float intensity = dcont + 0.3 + ambient;
+
+    v_color = u_materialDiffuse  * intensity;
+
+    gl_Position = u_viewProjectionMatrix * u_modelMatrix * vec4(a_vertex, 1.0);
+}
+"""
+
+BASIC_FRAGMENT_SHADER_120 = """
+#version 120
+
+varying vec4 v_color;
+
+void main() {
+    gl_FragColor = v_color;
+}
+"""
+
+BASIC_FRAGMENT_SHADER_130 = """
+#version 130
+
+in vec4 v_color;
+
+void main() {
+    gl_FragColor = v_color;
+}
+"""
+
+GOOCH_VERTEX_SHADER_120 = """
+#version 120
+
+// attributes
+attribute vec3 a_vertex; // xyz - position
+attribute vec3 a_normal; // xyz - normal
+
+// uniforms
+uniform mat4 u_modelMatrix;
+uniform mat4 u_viewProjectionMatrix;
+uniform mat3 u_normalMatrix;
+uniform vec3 u_lightPos;
+uniform vec3 u_camPos;
+
+// output data from vertex to fragment shader
+varying vec3 o_normal;
+varying vec3 o_lightVector;
+
+///////////////////////////////////////////////////////////////////
+
+void main(void)
+{
+   // transform position and normal to world space
+   vec4 positionWorld = u_modelMatrix * vec4(a_vertex, 1.0);
+   vec3 normalWorld = u_normalMatrix * a_normal;
+
+   // calculate and pass vectors required for lighting
+   o_lightVector = u_lightPos - positionWorld.xyz;
+   o_normal = normalWorld;
+
+   // project world space position to the screen and output it
+   gl_Position = u_viewProjectionMatrix * positionWorld;
+}
+"""
+
+GOOCH_VERTEX_SHADER_130 = """
+#version 130
+
+// attributes
+in vec3 a_vertex; // xyz - position
+in vec3 a_normal; // xyz - normal
+
+// uniforms
+uniform mat4 u_modelMatrix;
+uniform mat4 u_viewProjectionMatrix;
+uniform mat3 u_normalMatrix;
+uniform vec3 u_lightPos;
+uniform vec3 u_camPos;
+
+// output data from vertex to fragment shader
+out vec3 o_normal;
+out vec3 o_lightVector;
+
+///////////////////////////////////////////////////////////////////
+
+void main(void)
+{
+   // transform position and normal to world space
+   vec4 positionWorld = u_modelMatrix * vec4(a_vertex, 1.0);
+   vec3 normalWorld = u_normalMatrix * a_normal;
+
+   // calculate and pass vectors required for lighting
+   o_lightVector = u_lightPos - positionWorld.xyz;
+   o_normal = normalWorld;
+
+   // project world space position to the screen and output it
+   gl_Position = u_viewProjectionMatrix * positionWorld;
+}
+"""
+
+GOOCH_FRAGMENT_SHADER_120 = """
+#version 120
+
+// data from vertex shader
+varying vec3 o_normal;
+varying vec3 o_lightVector;
+
+// diffuse color of the object
+uniform vec4 u_materialDiffuse;
+// cool color of gooch shading
+uniform vec3 u_coolColor;
+// warm color of gooch shading
+uniform vec3 u_warmColor;
+// how much to take from object color in final cool color
+uniform float u_alpha;
+// how much to take from object color in final warm color
+uniform float u_beta;
+
+///////////////////////////////////////////////////////////
+
+void main(void)
+{
+   // normlize vectors for lighting
+   vec3 normalVector = normalize(o_normal);
+   vec3 lightVector = normalize(o_lightVector);
+   // intensity of diffuse lighting [-1, 1]
+   float diffuseLighting = dot(lightVector, normalVector);
+   // map intensity of lighting from range [-1; 1] to [0, 1]
+   float interpolationValue = (1.0 + diffuseLighting)/2;
+
+   //////////////////////////////////////////////////////////////////
+
+   // cool color mixed with color of the object
+   vec3 coolColorMod = u_coolColor + vec3(u_materialDiffuse) * u_alpha;
+   // warm color mixed with color of the object
+   vec3 warmColorMod = u_warmColor + vec3(u_materialDiffuse) * u_beta;
+   // interpolation of cool and warm colors according
+   // to lighting intensity. The lower the light intensity,
+   // the larger part of the cool color is used
+   vec3 colorOut = mix(coolColorMod, warmColorMod, interpolationValue);
+
+   //////////////////////////////////////////////////////////////////
+
+   // save color
+   gl_FragColor.rgb = colorOut;
+   gl_FragColor.a = 1;
+}
+"""
+
+GOOCH_FRAGMENT_SHADER_130 = """
+#version 130
+
+// data from vertex shader
+in vec3 o_normal;
+in vec3 o_lightVector;
+
+// diffuse color of the object
+uniform vec4 u_materialDiffuse;
+// cool color of gooch shading
+uniform vec3 u_coolColor;
+// warm color of gooch shading
+uniform vec3 u_warmColor;
+// how much to take from object color in final cool color
+uniform float u_alpha;
+// how much to take from object color in final warm color
+uniform float u_beta;
+
+// output to framebuffer
+out vec4 resultingColor;
+
+///////////////////////////////////////////////////////////
+
+void main(void)
+{
+   // normlize vectors for lighting
+   vec3 normalVector = normalize(o_normal);
+   vec3 lightVector = normalize(o_lightVector);
+   // intensity of diffuse lighting [-1, 1]
+   float diffuseLighting = dot(lightVector, normalVector);
+   // map intensity of lighting from range [-1; 1] to [0, 1]
+   float interpolationValue = (1.0 + diffuseLighting)/2;
+
+   //////////////////////////////////////////////////////////////////
+
+   // cool color mixed with color of the object
+   vec3 coolColorMod = u_coolColor + vec3(u_materialDiffuse) * u_alpha;
+   // warm color mixed with color of the object
+   vec3 warmColorMod = u_warmColor + vec3(u_materialDiffuse) * u_beta;
+   // interpolation of cool and warm colors according
+   // to lighting intensity. The lower the light intensity,
+   // the larger part of the cool color is used
+   vec3 colorOut = mix(coolColorMod, warmColorMod, interpolationValue);
+
+   //////////////////////////////////////////////////////////////////
+
+   // save color
+   resultingColor.rgb = colorOut;
+   resultingColor.a = 1;
+}
+"""
+
+SILHOUETTE_VERTEX_SHADER_120 = """
+#version 120
+
+attribute vec3 a_vertex; // xyz - position
+attribute vec3 a_normal; // xyz - normal
+
+uniform mat4 u_modelMatrix;
+uniform mat4 u_viewProjectionMatrix;
+uniform mat4 u_modelViewMatrix;
+uniform vec4 u_materialDiffuse;
+uniform float u_bordersize; // width of the border
+
+varying vec4 v_color;
+
+void main(void){
+   v_color = u_materialDiffuse;
+   float distToCamera = -(u_modelViewMatrix * vec4(a_vertex, 1.0)).z;
+   vec4 tPos   = vec4(a_vertex + a_normal * u_bordersize * distToCamera, 1.0);
+   gl_Position = u_viewProjectionMatrix * u_modelMatrix * tPos;
+}
+"""
+
+SILHOUETTE_VERTEX_SHADER_130 = """
+#version 130
+
+in vec3 a_vertex; // xyz - position
+in vec3 a_normal; // xyz - normal
+
+uniform mat4 u_modelMatrix;
+uniform mat4 u_viewProjectionMatrix;
+uniform mat4 u_modelViewMatrix;
+uniform vec4 u_materialDiffuse;
+uniform float u_bordersize; // width of the border
+
+out vec4 v_color;
+
+void main(void){
+   v_color = u_materialDiffuse;
+   float distToCamera = -(u_modelViewMatrix * vec4(a_vertex, 1.0)).z;
+   vec4 tPos   = vec4(a_vertex + a_normal * u_bordersize * distToCamera, 1.0);
+   gl_Position = u_viewProjectionMatrix * u_modelMatrix * tPos;
+}
+"""
+DEFAULT_CLIP_PLANE_NEAR = 0.001
+DEFAULT_CLIP_PLANE_FAR = 1000.0
+
+
+def get_world_transform(scene, node):
+    if node == scene.rootnode:
+        return numpy.identity(4, dtype=numpy.float32)
+
+    parents = reversed(_get_parent_chain(scene, node, []))
+    parent_transform = reduce(numpy.dot, [p.transformation for p in parents])
+    return numpy.dot(parent_transform, node.transformation)
+
+
+def _get_parent_chain(scene, node, parents):
+    parent = node.parent
+
+    parents.append(parent)
+
+    if parent == scene.rootnode:
+        return parents
+
+    return _get_parent_chain(scene, parent, parents)
+
+
+class DefaultCamera:
+    def __init__(self, w, h, fov):
+        self.name = "default camera"
+        self.type = CAMERA
+        self.clipplanenear = DEFAULT_CLIP_PLANE_NEAR
+        self.clipplanefar = DEFAULT_CLIP_PLANE_FAR
+        self.aspect = w / h
+        self.horizontalfov = fov * math.pi / 180
+        self.transformation = numpy.array([[0.68, -0.32, 0.65, 7.48],
+                                           [0.73, 0.31, -0.61, -6.51],
+                                           [-0.01, 0.89, 0.44, 5.34],
+                                           [0., 0., 0., 1.]], dtype=numpy.float32)
+
+        self.transformation = numpy.dot(self.transformation, ROTATION_180_X)
+
+    def __str__(self):
+        return self.name
+
+
+class PyAssimp3DViewer:
+    base_name = "PyASSIMP 3D viewer"
+
+    def __init__(self, model, w=1024, h=768):
+
+        self.w = w
+        self.h = h
+
+        pygame.init()
+        pygame.display.set_caption(self.base_name)
+        pygame.display.set_mode((w, h), pygame.OPENGL | pygame.DOUBLEBUF)
+
+        glClearColor(0.18, 0.18, 0.18, 1.0)
+
+        shader_compilation_succeeded = False
+        try:
+            self.set_shaders_v130()
+            self.prepare_shaders()
+        except RuntimeError, message:
+            sys.stderr.write("%s\n" % message)
+            sys.stdout.write("Could not compile shaders in version 1.30, trying version 1.20\n")
+
+        if not shader_compilation_succeeded:
+            self.set_shaders_v120()
+            self.prepare_shaders()
+
+        self.scene = None
+        self.meshes = {}  # stores the OpenGL vertex/faces/normals buffers pointers
+
+        self.node2colorid = {}  # stores a color ID for each node. Useful for mouse picking and visibility checking
+        self.colorid2node = {}  # reverse dict of node2colorid
+
+        self.currently_selected = None
+        self.moving = False
+        self.moving_situation = None
+
+        self.default_camera = DefaultCamera(self.w, self.h, fov=70)
+        self.cameras = [self.default_camera]
+
+        self.current_cam_index = 0
+        self.current_cam = self.default_camera
+        self.set_camera_projection()
+
+        self.load_model(model)
+
+        # user interactions
+        self.focal_point = [0, 0, 0]
+        self.is_rotating = False
+        self.is_panning = False
+        self.is_zooming = False
+
+    def set_shaders_v120(self):
+      self.BASIC_VERTEX_SHADER = BASIC_VERTEX_SHADER_120
+      self.FLAT_VERTEX_SHADER = FLAT_VERTEX_SHADER_120
+      self.SILHOUETTE_VERTEX_SHADER = SILHOUETTE_VERTEX_SHADER_120
+      self.GOOCH_VERTEX_SHADER = GOOCH_VERTEX_SHADER_120
+
+      self.BASIC_FRAGMENT_SHADER = BASIC_FRAGMENT_SHADER_120
+      self.GOOCH_FRAGMENT_SHADER = GOOCH_FRAGMENT_SHADER_120
+
+    def set_shaders_v130(self):
+      self.BASIC_VERTEX_SHADER = BASIC_VERTEX_SHADER_130
+      self.FLAT_VERTEX_SHADER = FLAT_VERTEX_SHADER_130
+      self.SILHOUETTE_VERTEX_SHADER = SILHOUETTE_VERTEX_SHADER_130
+      self.GOOCH_VERTEX_SHADER = GOOCH_VERTEX_SHADER_130
+
+      self.BASIC_FRAGMENT_SHADER = BASIC_FRAGMENT_SHADER_130
+      self.GOOCH_FRAGMENT_SHADER = GOOCH_FRAGMENT_SHADER_130
+
+    def prepare_shaders(self):
+
+        ### Base shader
+        vertex = shaders.compileShader(self.BASIC_VERTEX_SHADER, GL_VERTEX_SHADER)
+        fragment = shaders.compileShader(self.BASIC_FRAGMENT_SHADER, GL_FRAGMENT_SHADER)
+
+        self.shader = shaders.compileProgram(vertex, fragment)
+
+        self.set_shader_accessors(('u_modelMatrix',
+                                   'u_viewProjectionMatrix',
+                                   'u_normalMatrix',
+                                   'u_lightPos',
+                                   'u_materialDiffuse'),
+                                  ('a_vertex',
+                                   'a_normal'), self.shader)
+
+        ### Flat shader
+        flatvertex = shaders.compileShader(self.FLAT_VERTEX_SHADER, GL_VERTEX_SHADER)
+        self.flatshader = shaders.compileProgram(flatvertex, fragment)
+
+        self.set_shader_accessors(('u_modelMatrix',
+                                   'u_viewProjectionMatrix',
+                                   'u_materialDiffuse',),
+                                  ('a_vertex',), self.flatshader)
+
+        ### Silhouette shader
+        silh_vertex = shaders.compileShader(self.SILHOUETTE_VERTEX_SHADER, GL_VERTEX_SHADER)
+        self.silhouette_shader = shaders.compileProgram(silh_vertex, fragment)
+
+        self.set_shader_accessors(('u_modelMatrix',
+                                   'u_viewProjectionMatrix',
+                                   'u_modelViewMatrix',
+                                   'u_materialDiffuse',
+                                   'u_bordersize'  # width of the silhouette
+                                   ),
+                                  ('a_vertex',
+                                   'a_normal'), self.silhouette_shader)
+
+        ### Gooch shader
+        gooch_vertex = shaders.compileShader(self.GOOCH_VERTEX_SHADER, GL_VERTEX_SHADER)
+        gooch_fragment = shaders.compileShader(self.GOOCH_FRAGMENT_SHADER, GL_FRAGMENT_SHADER)
+        self.gooch_shader = shaders.compileProgram(gooch_vertex, gooch_fragment)
+
+        self.set_shader_accessors(('u_modelMatrix',
+                                   'u_viewProjectionMatrix',
+                                   'u_normalMatrix',
+                                   'u_lightPos',
+                                   'u_materialDiffuse',
+                                   'u_coolColor',
+                                   'u_warmColor',
+                                   'u_alpha',
+                                   'u_beta'
+                                   ),
+                                  ('a_vertex',
+                                   'a_normal'), self.gooch_shader)
+
+    @staticmethod
+    def set_shader_accessors(uniforms, attributes, shader):
+        # add accessors to the shaders uniforms and attributes
+        for uniform in uniforms:
+            location = glGetUniformLocation(shader, uniform)
+            if location in (None, -1):
+                raise RuntimeError('No uniform: %s (maybe it is not used '
+                                   'anymore and has been optimized out by'
+                                   ' the shader compiler)' % uniform)
+            setattr(shader, uniform, location)
+
+        for attribute in attributes:
+            location = glGetAttribLocation(shader, attribute)
+            if location in (None, -1):
+                raise RuntimeError('No attribute: %s' % attribute)
+            setattr(shader, attribute, location)
+
+    @staticmethod
+    def prepare_gl_buffers(mesh):
+
+        mesh.gl = {}
+
+        # Fill the buffer for vertex and normals positions
+        v = numpy.array(mesh.vertices, 'f')
+        n = numpy.array(mesh.normals, 'f')
+
+        mesh.gl["vbo"] = vbo.VBO(numpy.hstack((v, n)))
+
+        # Fill the buffer for vertex positions
+        mesh.gl["faces"] = glGenBuffers(1)
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh.gl["faces"])
+        glBufferData(GL_ELEMENT_ARRAY_BUFFER,
+                     numpy.array(mesh.faces, dtype=numpy.int32),
+                     GL_STATIC_DRAW)
+
+        mesh.gl["nbfaces"] = len(mesh.faces)
+
+        # Unbind buffers
+        glBindBuffer(GL_ARRAY_BUFFER, 0)
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0)
+
+    @staticmethod
+    def get_rgb_from_colorid(colorid):
+        r = (colorid >> 0) & 0xff
+        g = (colorid >> 8) & 0xff
+        b = (colorid >> 16) & 0xff
+
+        return r, g, b
+
+    def get_color_id(self):
+        id = random.randint(0, 256 * 256 * 256)
+        if id not in self.colorid2node:
+            return id
+        else:
+            return self.get_color_id()
+
+    def glize(self, scene, node):
+
+        logger.info("Loading node <%s>" % node)
+        node.selected = True if self.currently_selected and self.currently_selected == node else False
+
+        node.transformation = node.transformation.astype(numpy.float32)
+
+        if node.meshes:
+            node.type = MESH
+            colorid = self.get_color_id()
+            self.colorid2node[colorid] = node
+            self.node2colorid[node.name] = colorid
+
+        elif node.name in [c.name for c in scene.cameras]:
+
+            # retrieve the ASSIMP camera object
+            [cam] = [c for c in scene.cameras if c.name == node.name]
+            node.type = CAMERA
+            logger.info("Added camera <%s>" % node.name)
+            logger.info("Camera position: %.3f, %.3f, %.3f" % tuple(node.transformation[:, 3][:3].tolist()))
+            self.cameras.append(node)
+            node.clipplanenear = cam.clipplanenear
+            node.clipplanefar = cam.clipplanefar
+
+            if numpy.allclose(cam.lookat, [0, 0, -1]) and numpy.allclose(cam.up, [0, 1, 0]):  # Cameras in .blend files
+
+                # Rotate by 180deg around X to have Z pointing forward
+                node.transformation = numpy.dot(node.transformation, ROTATION_180_X)
+            else:
+                raise RuntimeError(
+                    "I do not know how to normalize this camera orientation: lookat=%s, up=%s" % (cam.lookat, cam.up))
+
+            if cam.aspect == 0.0:
+                logger.warning("Camera aspect not set. Setting to default 4:3")
+                node.aspect = 1.333
+            else:
+                node.aspect = cam.aspect
+
+            node.horizontalfov = cam.horizontalfov
+
+        else:
+            node.type = ENTITY
+
+        for child in node.children:
+            self.glize(scene, child)
+
+    def load_model(self, path, postprocess=aiProcessPreset_TargetRealtime_MaxQuality):
+        logger.info("Loading model:" + path + "...")
+
+        if postprocess:
+            self.scene = pyassimp.load(path, processing=postprocess)
+        else:
+            self.scene = pyassimp.load(path)
+        logger.info("Done.")
+
+        scene = self.scene
+        # log some statistics
+        logger.info("  meshes: %d" % len(scene.meshes))
+        logger.info("  total faces: %d" % sum([len(mesh.faces) for mesh in scene.meshes]))
+        logger.info("  materials: %d" % len(scene.materials))
+        self.bb_min, self.bb_max = get_bounding_box(self.scene)
+        logger.info("  bounding box:" + str(self.bb_min) + " - " + str(self.bb_max))
+
+        self.scene_center = [(a + b) / 2. for a, b in zip(self.bb_min, self.bb_max)]
+
+        for index, mesh in enumerate(scene.meshes):
+            self.prepare_gl_buffers(mesh)
+
+        self.glize(scene, scene.rootnode)
+
+        # Finally release the model
+        pyassimp.release(scene)
+        logger.info("Ready for 3D rendering!")
+
+    def cycle_cameras(self):
+
+        self.current_cam_index = (self.current_cam_index + 1) % len(self.cameras)
+        self.current_cam = self.cameras[self.current_cam_index]
+        self.set_camera_projection(self.current_cam)
+        logger.info("Switched to camera <%s>" % self.current_cam)
+
+    def set_overlay_projection(self):
+        glViewport(0, 0, self.w, self.h)
+        glMatrixMode(GL_PROJECTION)
+        glLoadIdentity()
+        glOrtho(0.0, self.w - 1.0, 0.0, self.h - 1.0, -1.0, 1.0)
+        glMatrixMode(GL_MODELVIEW)
+        glLoadIdentity()
+
+    def set_camera_projection(self, camera=None):
+
+        if not camera:
+            camera = self.current_cam
+
+        znear = camera.clipplanenear or DEFAULT_CLIP_PLANE_NEAR
+        zfar = camera.clipplanefar or DEFAULT_CLIP_PLANE_FAR
+        aspect = camera.aspect
+        fov = camera.horizontalfov
+
+        glMatrixMode(GL_PROJECTION)
+        glLoadIdentity()
+
+        # Compute gl frustrum
+        tangent = math.tan(fov / 2.)
+        h = znear * tangent
+        w = h * aspect
+
+        # params: left, right, bottom, top, near, far
+        glFrustum(-w, w, -h, h, znear, zfar)
+        # equivalent to:
+        # gluPerspective(fov * 180/math.pi, aspect, znear, zfar)
+
+        self.projection_matrix = glGetFloatv(GL_PROJECTION_MATRIX).transpose()
+
+        glMatrixMode(GL_MODELVIEW)
+        glLoadIdentity()
+
+    def render_colors(self):
+
+        glEnable(GL_DEPTH_TEST)
+        glDepthFunc(GL_LEQUAL)
+
+        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL)
+        glEnable(GL_CULL_FACE)
+
+        glUseProgram(self.flatshader)
+
+        glUniformMatrix4fv(self.flatshader.u_viewProjectionMatrix, 1, GL_TRUE,
+                           numpy.dot(self.projection_matrix, self.view_matrix))
+
+        self.recursive_render(self.scene.rootnode, self.flatshader, mode=COLORS)
+
+        glUseProgram(0)
+
+    def get_hovered_node(self, mousex, mousey):
+        """
+        Attention: The performances of this method relies heavily on the size of the display!
+        """
+
+        # mouse out of the window?
+        if mousex < 0 or mousex >= self.w or mousey < 0 or mousey >= self.h:
+            return None
+
+        self.render_colors()
+        # Capture image from the OpenGL buffer
+        buf = (GLubyte * (3 * self.w * self.h))(0)
+        glReadPixels(0, 0, self.w, self.h, GL_RGB, GL_UNSIGNED_BYTE, buf)
+
+        # Reinterpret the RGB pixel buffer as a 1-D array of 24bits colors
+        a = numpy.ndarray(len(buf), numpy.dtype('>u1'), buf)
+        colors = numpy.zeros(len(buf) / 3, numpy.dtype('<u4'))
+        for i in range(3):
+            colors.view(dtype='>u1')[i::4] = a.view(dtype='>u1')[i::3]
+
+        colorid = colors[mousex + mousey * self.w]
+
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
+
+        if colorid in self.colorid2node:
+            return self.colorid2node[colorid]
+
+    def render(self, wireframe=False, twosided=False):
+
+        glEnable(GL_DEPTH_TEST)
+        glDepthFunc(GL_LEQUAL)
+
+        glPolygonMode(GL_FRONT_AND_BACK, GL_LINE if wireframe else GL_FILL)
+        glDisable(GL_CULL_FACE) if twosided else glEnable(GL_CULL_FACE)
+
+        self.render_grid()
+
+        self.recursive_render(self.scene.rootnode, None, mode=HELPERS)
+
+        ### First, the silhouette
+
+        if False:
+            shader = self.silhouette_shader
+
+            # glDepthMask(GL_FALSE)
+            glCullFace(GL_FRONT)  # cull front faces
+
+            glUseProgram(shader)
+            glUniform1f(shader.u_bordersize, 0.01)
+
+            glUniformMatrix4fv(shader.u_viewProjectionMatrix, 1, GL_TRUE,
+                               numpy.dot(self.projection_matrix, self.view_matrix))
+
+            self.recursive_render(self.scene.rootnode, shader, mode=SILHOUETTE)
+
+            glUseProgram(0)
+
+        ### Then, inner shading
+        # glDepthMask(GL_TRUE)
+        glCullFace(GL_BACK)
+
+        use_gooch = False
+        if use_gooch:
+            shader = self.gooch_shader
+
+            glUseProgram(shader)
+            glUniform3f(shader.u_lightPos, -.5, -.5, .5)
+
+            ##### GOOCH specific
+            glUniform3f(shader.u_coolColor, 159.0 / 255, 148.0 / 255, 255.0 / 255)
+            glUniform3f(shader.u_warmColor, 255.0 / 255, 75.0 / 255, 75.0 / 255)
+            glUniform1f(shader.u_alpha, .25)
+            glUniform1f(shader.u_beta, .25)
+            #########
+        else:
+            shader = self.shader
+            glUseProgram(shader)
+            glUniform3f(shader.u_lightPos, -.5, -.5, .5)
+
+        glUniformMatrix4fv(shader.u_viewProjectionMatrix, 1, GL_TRUE,
+                           numpy.dot(self.projection_matrix, self.view_matrix))
+
+        self.recursive_render(self.scene.rootnode, shader)
+
+        glUseProgram(0)
+
+    def render_axis(self,
+                    transformation=numpy.identity(4, dtype=numpy.float32),
+                    label=None,
+                    size=0.2,
+                    selected=False):
+        m = transformation.transpose()  # OpenGL row major
+
+        glPushMatrix()
+        glMultMatrixf(m)
+
+        glLineWidth(3 if selected else 1)
+
+        size = 2 * size if selected else size
+
+        glBegin(GL_LINES)
+
+        # draw line for x axis
+        glColor3f(1.0, 0.0, 0.0)
+        glVertex3f(0.0, 0.0, 0.0)
+        glVertex3f(size, 0.0, 0.0)
+
+        # draw line for y axis
+        glColor3f(0.0, 1.0, 0.0)
+        glVertex3f(0.0, 0.0, 0.0)
+        glVertex3f(0.0, size, 0.0)
+
+        # draw line for Z axis
+        glColor3f(0.0, 0.0, 1.0)
+        glVertex3f(0.0, 0.0, 0.0)
+        glVertex3f(0.0, 0.0, size)
+
+        glEnd()
+
+        if label:
+            self.showtext(label)
+
+        glPopMatrix()
+
+    @staticmethod
+    def render_camera(camera, transformation):
+
+        m = transformation.transpose()  # OpenGL row major
+
+        aspect = camera.aspect
+
+        u = 0.1  # unit size (in m)
+        l = 3 * u  # length of the camera cone
+        f = 3 * u  # aperture of the camera cone
+
+        glPushMatrix()
+        glMultMatrixf(m)
+
+        glLineWidth(2)
+        glBegin(GL_LINE_STRIP)
+
+        glColor3f(.2, .2, .2)
+
+        glVertex3f(u, u, -u)
+        glVertex3f(u, -u, -u)
+        glVertex3f(-u, -u, -u)
+        glVertex3f(-u, u, -u)
+        glVertex3f(u, u, -u)
+
+        glVertex3f(u, u, 0.0)
+        glVertex3f(u, -u, 0.0)
+        glVertex3f(-u, -u, 0.0)
+        glVertex3f(-u, u, 0.0)
+        glVertex3f(u, u, 0.0)
+
+        glVertex3f(f * aspect, f, l)
+        glVertex3f(f * aspect, -f, l)
+        glVertex3f(-f * aspect, -f, l)
+        glVertex3f(-f * aspect, f, l)
+        glVertex3f(f * aspect, f, l)
+
+        glEnd()
+
+        glBegin(GL_LINE_STRIP)
+        glVertex3f(u, -u, -u)
+        glVertex3f(u, -u, 0.0)
+        glVertex3f(f * aspect, -f, l)
+        glEnd()
+
+        glBegin(GL_LINE_STRIP)
+        glVertex3f(-u, -u, -u)
+        glVertex3f(-u, -u, 0.0)
+        glVertex3f(-f * aspect, -f, l)
+        glEnd()
+
+        glBegin(GL_LINE_STRIP)
+        glVertex3f(-u, u, -u)
+        glVertex3f(-u, u, 0.0)
+        glVertex3f(-f * aspect, f, l)
+        glEnd()
+
+        glPopMatrix()
+
+    @staticmethod
+    def render_grid():
+
+        glLineWidth(1)
+        glColor3f(0.5, 0.5, 0.5)
+        glBegin(GL_LINES)
+        for i in range(-10, 11):
+            glVertex3f(i, -10.0, 0.0)
+            glVertex3f(i, 10.0, 0.0)
+
+        for i in range(-10, 11):
+            glVertex3f(-10.0, i, 0.0)
+            glVertex3f(10.0, i, 0.0)
+        glEnd()
+
+    def recursive_render(self, node, shader, mode=BASE, with_normals=True):
+        """ Main recursive rendering method.
+        """
+
+        normals = with_normals
+
+        if mode == COLORS:
+            normals = False
+
+
+        if not hasattr(node, "selected"):
+            node.selected = False
+
+        m = get_world_transform(self.scene, node)
+
+        # HELPERS mode
+        ###
+        if mode == HELPERS:
+            # if node.type == ENTITY:
+            self.render_axis(m,
+                             label=node.name if node != self.scene.rootnode else None,
+                             selected=node.selected if hasattr(node, "selected") else False)
+
+            if node.type == CAMERA:
+                self.render_camera(node, m)
+
+            for child in node.children:
+                    self.recursive_render(child, shader, mode)
+
+            return
+
+        # Mesh rendering modes
+        ###
+        if node.type == MESH:
+
+            for mesh in node.meshes:
+
+                stride = 24  # 6 * 4 bytes
+
+                if node.selected and mode == SILHOUETTE:
+                    glUniform4f(shader.u_materialDiffuse, 1.0, 0.0, 0.0, 1.0)
+                    glUniformMatrix4fv(shader.u_modelViewMatrix, 1, GL_TRUE,
+                                       numpy.dot(self.view_matrix, m))
+
+                else:
+                    if mode == COLORS:
+                        colorid = self.node2colorid[node.name]
+                        r, g, b = self.get_rgb_from_colorid(colorid)
+                        glUniform4f(shader.u_materialDiffuse, r / 255.0, g / 255.0, b / 255.0, 1.0)
+                    elif mode == SILHOUETTE:
+                        glUniform4f(shader.u_materialDiffuse, .0, .0, .0, 1.0)
+                    else:
+                        if node.selected:
+                            diffuse = (1.0, 0.0, 0.0, 1.0)  # selected nodes in red
+                        else:
+                            diffuse = mesh.material.properties["diffuse"]
+                        if len(diffuse) == 3:  # RGB instead of expected RGBA
+                            diffuse.append(1.0)
+                        glUniform4f(shader.u_materialDiffuse, *diffuse)
+                        # if ambient:
+                        #    glUniform4f( shader.Material_ambient, *mat["ambient"] )
+
+                if mode == BASE:  # not in COLORS or SILHOUETTE
+                    normal_matrix = linalg.inv(numpy.dot(self.view_matrix, m)[0:3, 0:3]).transpose()
+                    glUniformMatrix3fv(shader.u_normalMatrix, 1, GL_TRUE, normal_matrix)
+
+                glUniformMatrix4fv(shader.u_modelMatrix, 1, GL_TRUE, m)
+
+                vbo = mesh.gl["vbo"]
+                vbo.bind()
+
+                glEnableVertexAttribArray(shader.a_vertex)
+                if normals:
+                    glEnableVertexAttribArray(shader.a_normal)
+
+                glVertexAttribPointer(
+                    shader.a_vertex,
+                    3, GL_FLOAT, False, stride, vbo
+                )
+
+                if normals:
+                    glVertexAttribPointer(
+                        shader.a_normal,
+                        3, GL_FLOAT, False, stride, vbo + 12
+                    )
+
+                glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh.gl["faces"])
+                glDrawElements(GL_TRIANGLES, mesh.gl["nbfaces"] * 3, GL_UNSIGNED_INT, None)
+
+                vbo.unbind()
+                glDisableVertexAttribArray(shader.a_vertex)
+
+                if normals:
+                    glDisableVertexAttribArray(shader.a_normal)
+
+                glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0)
+
+        for child in node.children:
+            self.recursive_render(child, shader, mode)
+
+
+    def switch_to_overlay(self):
+        glPushMatrix()
+        self.set_overlay_projection()
+
+    def switch_from_overlay(self):
+        self.set_camera_projection()
+        glPopMatrix()
+
+    def select_node(self, node):
+        self.currently_selected = node
+        self.update_node_select(self.scene.rootnode)
+
+    def update_node_select(self, node):
+        if node is self.currently_selected:
+            node.selected = True
+        else:
+            node.selected = False
+
+        for child in node.children:
+            self.update_node_select(child)
+
+    def loop(self):
+
+        pygame.display.flip()
+
+        if not self.process_events():
+            return False  # ESC has been pressed
+
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
+
+        return True
+
+    def process_events(self):
+
+        LEFT_BUTTON = 1
+        MIDDLE_BUTTON = 2
+        RIGHT_BUTTON = 3
+        WHEEL_UP = 4
+        WHEEL_DOWN = 5
+
+        dx, dy = pygame.mouse.get_rel()
+        mousex, mousey = pygame.mouse.get_pos()
+
+        zooming_one_shot = False
+
+        ok = True
+
+        for evt in pygame.event.get():
+            if evt.type == pygame.MOUSEBUTTONDOWN and evt.button == LEFT_BUTTON:
+                hovered = self.get_hovered_node(mousex, self.h - mousey)
+                if hovered:
+                    if self.currently_selected and self.currently_selected == hovered:
+                        self.select_node(None)
+                    else:
+                        logger.info("Node %s selected" % hovered)
+                        self.select_node(hovered)
+                else:
+                    self.is_rotating = True
+            if evt.type == pygame.MOUSEBUTTONUP and evt.button == LEFT_BUTTON:
+                self.is_rotating = False
+
+            if evt.type == pygame.MOUSEBUTTONDOWN and evt.button == MIDDLE_BUTTON:
+                self.is_panning = True
+            if evt.type == pygame.MOUSEBUTTONUP and evt.button == MIDDLE_BUTTON:
+                self.is_panning = False
+
+            if evt.type == pygame.MOUSEBUTTONDOWN and evt.button == RIGHT_BUTTON:
+                self.is_zooming = True
+            if evt.type == pygame.MOUSEBUTTONUP and evt.button == RIGHT_BUTTON:
+                self.is_zooming = False
+
+            if evt.type == pygame.MOUSEBUTTONDOWN and evt.button in [WHEEL_UP, WHEEL_DOWN]:
+                zooming_one_shot = True
+                self.is_zooming = True
+                dy = -10 if evt.button == WHEEL_UP else 10
+
+            if evt.type == pygame.KEYDOWN:
+                ok = (ok and self.process_keystroke(evt.key, evt.mod))
+
+        self.controls_3d(dx, dy, zooming_one_shot)
+
+        return ok
+
+    def process_keystroke(self, key, mod):
+
+        # process arrow keys if an object is selected
+        if self.currently_selected:
+            up = 0
+            strafe = 0
+
+            if key == pygame.K_UP:
+                up = 1
+            if key == pygame.K_DOWN:
+                up = -1
+            if key == pygame.K_LEFT:
+                strafe = -1
+            if key == pygame.K_RIGHT:
+                strafe = 1
+
+            self.move_selected_node(up, strafe)
+
+        if key == pygame.K_f:
+            pygame.display.toggle_fullscreen()
+
+        if key == pygame.K_TAB:
+            self.cycle_cameras()
+
+        if key in [pygame.K_ESCAPE, pygame.K_q]:
+            return False
+
+        return True
+
+    def controls_3d(self, dx, dy, zooming_one_shot=False):
+
+        CAMERA_TRANSLATION_FACTOR = 0.01
+        CAMERA_ROTATION_FACTOR = 0.01
+
+        if not (self.is_rotating or self.is_panning or self.is_zooming):
+            return
+
+        current_pos = self.current_cam.transformation[:3, 3].copy()
+        distance = numpy.linalg.norm(self.focal_point - current_pos)
+
+        if self.is_rotating:
+            """ Orbiting the camera is implemented the following way:
+
+            - the rotation is split into a rotation around the *world* Z axis
+              (controlled by the horizontal mouse motion along X) and a
+              rotation around the *X* axis of the camera (pitch) *shifted to
+              the focal origin* (the world origin for now). This is controlled
+              by the vertical motion of the mouse (Y axis).
+
+            - as a result, the resulting transformation of the camera in the
+              world frame C' is:
+                C' = (T · Rx · T⁻¹ · (Rz · C)⁻¹)⁻¹
+
+              where:
+                - C is the original camera transformation in the world frame,
+                - Rz is the rotation along the Z axis (in the world frame)
+                - T is the translation camera -> world (ie, the inverse of the
+                  translation part of C
+                - Rx is the rotation around X in the (translated) camera frame
+            """
+
+            rotation_camera_x = dy * CAMERA_ROTATION_FACTOR
+            rotation_world_z = dx * CAMERA_ROTATION_FACTOR
+            world_z_rotation = transformations.euler_matrix(0, 0, rotation_world_z)
+            cam_x_rotation = transformations.euler_matrix(rotation_camera_x, 0, 0)
+
+            after_world_z_rotation = numpy.dot(world_z_rotation, self.current_cam.transformation)
+
+            inverse_transformation = transformations.inverse_matrix(after_world_z_rotation)
+
+            translation = transformations.translation_matrix(
+                transformations.decompose_matrix(inverse_transformation)[3])
+            inverse_translation = transformations.inverse_matrix(translation)
+
+            new_inverse = numpy.dot(inverse_translation, inverse_transformation)
+            new_inverse = numpy.dot(cam_x_rotation, new_inverse)
+            new_inverse = numpy.dot(translation, new_inverse)
+
+            self.current_cam.transformation = transformations.inverse_matrix(new_inverse).astype(numpy.float32)
+
+        if self.is_panning:
+            tx = -dx * CAMERA_TRANSLATION_FACTOR * distance
+            ty = dy * CAMERA_TRANSLATION_FACTOR * distance
+            cam_transform = transformations.translation_matrix((tx, ty, 0)).astype(numpy.float32)
+            self.current_cam.transformation = numpy.dot(self.current_cam.transformation, cam_transform)
+
+        if self.is_zooming:
+            tz = dy * CAMERA_TRANSLATION_FACTOR * distance
+            cam_transform = transformations.translation_matrix((0, 0, tz)).astype(numpy.float32)
+            self.current_cam.transformation = numpy.dot(self.current_cam.transformation, cam_transform)
+
+        if zooming_one_shot:
+            self.is_zooming = False
+
+        self.update_view_camera()
+
+    def update_view_camera(self):
+
+        self.view_matrix = linalg.inv(self.current_cam.transformation)
+
+        # Rotate by 180deg around X to have Z pointing backward (OpenGL convention)
+        self.view_matrix = numpy.dot(ROTATION_180_X, self.view_matrix)
+
+        glMatrixMode(GL_MODELVIEW)
+        glLoadIdentity()
+        glMultMatrixf(self.view_matrix.transpose())
+
+    def move_selected_node(self, up, strafe):
+        self.currently_selected.transformation[0][3] += strafe
+        self.currently_selected.transformation[2][3] += up
+
+    @staticmethod
+    def showtext(text, x=0, y=0, z=0, size=20):
+
+        # TODO: alpha blending does not work...
+        # glEnable(GL_BLEND)
+        # glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
+
+        font = pygame.font.Font(None, size)
+        text_surface = font.render(text, True, (10, 10, 10, 255),
+                                  (255 * 0.18, 255 * 0.18, 255 * 0.18, 0))
+        text_data = pygame.image.tostring(text_surface, "RGBA", True)
+        glRasterPos3d(x, y, z)
+        glDrawPixels(text_surface.get_width(),
+                     text_surface.get_height(),
+                     GL_RGBA, GL_UNSIGNED_BYTE,
+                     text_data)
+
+        # glDisable(GL_BLEND)
+
+
+def main(model, width, height):
+    app = PyAssimp3DViewer(model, w=width, h=height)
+
+    clock = pygame.time.Clock()
+
+    while app.loop():
+
+        app.update_view_camera()
+
+        ## Main rendering
+        app.render()
+
+        ## GUI text display
+        app.switch_to_overlay()
+        app.showtext("Active camera: %s" % str(app.current_cam), 10, app.h - 30)
+        if app.currently_selected:
+            app.showtext("Selected node: %s" % app.currently_selected, 10, app.h - 50)
+            pos = app.h - 70
+
+            app.showtext("(%sm, %sm, %sm)" % (app.currently_selected.transformation[0, 3],
+                                              app.currently_selected.transformation[1, 3],
+                                              app.currently_selected.transformation[2, 3]), 30, pos)
+
+        app.switch_from_overlay()
+
+        # Make sure we do not go over 30fps
+        clock.tick(30)
+
+    logger.info("Quitting! Bye bye!")
+
+
+#########################################################################
+#########################################################################
+
+if __name__ == '__main__':
+    if not len(sys.argv) > 1:
+        print("Usage: " + __file__ + " <model>")
+        sys.exit(2)
+
+    main(model=sys.argv[1], width=1024, height=768)
diff --git a/libs/assimp/port/PyAssimp/scripts/3d_viewer_py3.py b/libs/assimp/port/PyAssimp/scripts/3d_viewer_py3.py
new file mode 100755
index 0000000..fcee637
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/scripts/3d_viewer_py3.py
@@ -0,0 +1,1316 @@
+#!/usr/bin/env python
+# -*- coding: UTF-8 -*-
+
+""" This program loads a model with PyASSIMP, and display it.
+
+Based on:
+- pygame code from http://3dengine.org/Spectator_%28PyOpenGL%29
+- http://www.lighthouse3d.com/tutorials
+- http://www.songho.ca/opengl/gl_transform.html
+- http://code.activestate.com/recipes/325391/
+- ASSIMP's C++ SimpleOpenGL viewer
+
+Authors: Séverin Lemaignan, 2012-2016
+"""
+import sys
+import logging
+
+from functools import reduce
+
+logger = logging.getLogger("pyassimp")
+gllogger = logging.getLogger("OpenGL")
+gllogger.setLevel(logging.WARNING)
+logging.basicConfig(level=logging.INFO)
+
+import OpenGL
+
+OpenGL.ERROR_CHECKING = False
+OpenGL.ERROR_LOGGING = False
+# OpenGL.ERROR_ON_COPY = True
+# OpenGL.FULL_LOGGING = True
+from OpenGL.GL import *
+from OpenGL.arrays import vbo
+from OpenGL.GL import shaders
+
+import pygame
+import pygame.font
+import pygame.image
+
+import math, random
+from numpy import linalg
+
+import pyassimp
+from pyassimp.postprocess import *
+from pyassimp.helper import *
+import transformations
+
+ROTATION_180_X = numpy.array([[1, 0, 0, 0], [0, -1, 0, 0], [0, 0, -1, 0], [0, 0, 0, 1]], dtype=numpy.float32)
+
+# rendering mode
+BASE = "BASE"
+COLORS = "COLORS"
+SILHOUETTE = "SILHOUETTE"
+HELPERS = "HELPERS"
+
+# Entities type
+ENTITY = "entity"
+CAMERA = "camera"
+MESH = "mesh"
+
+FLAT_VERTEX_SHADER_120 = """
+#version 120
+
+uniform mat4 u_viewProjectionMatrix;
+uniform mat4 u_modelMatrix;
+
+uniform vec4 u_materialDiffuse;
+
+attribute vec3 a_vertex;
+
+varying vec4 v_color;
+
+void main(void)
+{
+    v_color = u_materialDiffuse;
+    gl_Position = u_viewProjectionMatrix * u_modelMatrix * vec4(a_vertex, 1.0);
+}
+"""
+
+FLAT_VERTEX_SHADER_130 = """
+#version 130
+
+uniform mat4 u_viewProjectionMatrix;
+uniform mat4 u_modelMatrix;
+
+uniform vec4 u_materialDiffuse;
+
+in vec3 a_vertex;
+
+out vec4 v_color;
+
+void main(void)
+{
+    v_color = u_materialDiffuse;
+    gl_Position = u_viewProjectionMatrix * u_modelMatrix * vec4(a_vertex, 1.0);
+}
+"""
+
+BASIC_VERTEX_SHADER_120 = """
+#version 120
+
+uniform mat4 u_viewProjectionMatrix;
+uniform mat4 u_modelMatrix;
+uniform mat3 u_normalMatrix;
+uniform vec3 u_lightPos;
+
+uniform vec4 u_materialDiffuse;
+
+attribute vec3 a_vertex;
+attribute vec3 a_normal;
+
+varying vec4 v_color;
+
+void main(void)
+{
+    // Now the normal is in world space, as we pass the light in world space.
+    vec3 normal = u_normalMatrix * a_normal;
+
+    float dist = distance(a_vertex, u_lightPos);
+
+    // go to https://www.desmos.com/calculator/nmnaud1hrw to play with the parameters
+    // att is not used for now
+    float att=1.0/(1.0+0.8*dist*dist);
+
+    vec3 surf2light = normalize(u_lightPos - a_vertex);
+    vec3 norm = normalize(normal);
+    float dcont=max(0.0,dot(norm,surf2light));
+
+    float ambient = 0.3;
+    float intensity = dcont + 0.3 + ambient;
+
+    v_color = u_materialDiffuse  * intensity;
+
+    gl_Position = u_viewProjectionMatrix * u_modelMatrix * vec4(a_vertex, 1.0);
+}
+"""
+
+BASIC_VERTEX_SHADER_130 = """
+#version 130
+
+uniform mat4 u_viewProjectionMatrix;
+uniform mat4 u_modelMatrix;
+uniform mat3 u_normalMatrix;
+uniform vec3 u_lightPos;
+
+uniform vec4 u_materialDiffuse;
+
+in vec3 a_vertex;
+in vec3 a_normal;
+
+out vec4 v_color;
+
+void main(void)
+{
+    // Now the normal is in world space, as we pass the light in world space.
+    vec3 normal = u_normalMatrix * a_normal;
+
+    float dist = distance(a_vertex, u_lightPos);
+
+    // go to https://www.desmos.com/calculator/nmnaud1hrw to play with the parameters
+    // att is not used for now
+    float att=1.0/(1.0+0.8*dist*dist);
+
+    vec3 surf2light = normalize(u_lightPos - a_vertex);
+    vec3 norm = normalize(normal);
+    float dcont=max(0.0,dot(norm,surf2light));
+
+    float ambient = 0.3;
+    float intensity = dcont + 0.3 + ambient;
+
+    v_color = u_materialDiffuse  * intensity;
+
+    gl_Position = u_viewProjectionMatrix * u_modelMatrix * vec4(a_vertex, 1.0);
+}
+"""
+
+BASIC_FRAGMENT_SHADER_120 = """
+#version 120
+
+varying vec4 v_color;
+
+void main() {
+    gl_FragColor = v_color;
+}
+"""
+
+BASIC_FRAGMENT_SHADER_130 = """
+#version 130
+
+in vec4 v_color;
+
+void main() {
+    gl_FragColor = v_color;
+}
+"""
+
+GOOCH_VERTEX_SHADER_120 = """
+#version 120
+
+// attributes
+attribute vec3 a_vertex; // xyz - position
+attribute vec3 a_normal; // xyz - normal
+
+// uniforms
+uniform mat4 u_modelMatrix;
+uniform mat4 u_viewProjectionMatrix;
+uniform mat3 u_normalMatrix;
+uniform vec3 u_lightPos;
+uniform vec3 u_camPos;
+
+// output data from vertex to fragment shader
+varying vec3 o_normal;
+varying vec3 o_lightVector;
+
+///////////////////////////////////////////////////////////////////
+
+void main(void)
+{
+   // transform position and normal to world space
+   vec4 positionWorld = u_modelMatrix * vec4(a_vertex, 1.0);
+   vec3 normalWorld = u_normalMatrix * a_normal;
+
+   // calculate and pass vectors required for lighting
+   o_lightVector = u_lightPos - positionWorld.xyz;
+   o_normal = normalWorld;
+
+   // project world space position to the screen and output it
+   gl_Position = u_viewProjectionMatrix * positionWorld;
+}
+"""
+
+GOOCH_VERTEX_SHADER_130 = """
+#version 130
+
+// attributes
+in vec3 a_vertex; // xyz - position
+in vec3 a_normal; // xyz - normal
+
+// uniforms
+uniform mat4 u_modelMatrix;
+uniform mat4 u_viewProjectionMatrix;
+uniform mat3 u_normalMatrix;
+uniform vec3 u_lightPos;
+uniform vec3 u_camPos;
+
+// output data from vertex to fragment shader
+out vec3 o_normal;
+out vec3 o_lightVector;
+
+///////////////////////////////////////////////////////////////////
+
+void main(void)
+{
+   // transform position and normal to world space
+   vec4 positionWorld = u_modelMatrix * vec4(a_vertex, 1.0);
+   vec3 normalWorld = u_normalMatrix * a_normal;
+
+   // calculate and pass vectors required for lighting
+   o_lightVector = u_lightPos - positionWorld.xyz;
+   o_normal = normalWorld;
+
+   // project world space position to the screen and output it
+   gl_Position = u_viewProjectionMatrix * positionWorld;
+}
+"""
+
+GOOCH_FRAGMENT_SHADER_120 = """
+#version 120
+
+// data from vertex shader
+varying vec3 o_normal;
+varying vec3 o_lightVector;
+
+// diffuse color of the object
+uniform vec4 u_materialDiffuse;
+// cool color of gooch shading
+uniform vec3 u_coolColor;
+// warm color of gooch shading
+uniform vec3 u_warmColor;
+// how much to take from object color in final cool color
+uniform float u_alpha;
+// how much to take from object color in final warm color
+uniform float u_beta;
+
+///////////////////////////////////////////////////////////
+
+void main(void)
+{
+   // normlize vectors for lighting
+   vec3 normalVector = normalize(o_normal);
+   vec3 lightVector = normalize(o_lightVector);
+   // intensity of diffuse lighting [-1, 1]
+   float diffuseLighting = dot(lightVector, normalVector);
+   // map intensity of lighting from range [-1; 1] to [0, 1]
+   float interpolationValue = (1.0 + diffuseLighting)/2;
+
+   //////////////////////////////////////////////////////////////////
+
+   // cool color mixed with color of the object
+   vec3 coolColorMod = u_coolColor + vec3(u_materialDiffuse) * u_alpha;
+   // warm color mixed with color of the object
+   vec3 warmColorMod = u_warmColor + vec3(u_materialDiffuse) * u_beta;
+   // interpolation of cool and warm colors according
+   // to lighting intensity. The lower the light intensity,
+   // the larger part of the cool color is used
+   vec3 colorOut = mix(coolColorMod, warmColorMod, interpolationValue);
+
+   //////////////////////////////////////////////////////////////////
+
+   // save color
+   gl_FragColor.rgb = colorOut;
+   gl_FragColor.a = 1;
+}
+"""
+
+GOOCH_FRAGMENT_SHADER_130 = """
+#version 130
+
+// data from vertex shader
+in vec3 o_normal;
+in vec3 o_lightVector;
+
+// diffuse color of the object
+uniform vec4 u_materialDiffuse;
+// cool color of gooch shading
+uniform vec3 u_coolColor;
+// warm color of gooch shading
+uniform vec3 u_warmColor;
+// how much to take from object color in final cool color
+uniform float u_alpha;
+// how much to take from object color in final warm color
+uniform float u_beta;
+
+// output to framebuffer
+out vec4 resultingColor;
+
+///////////////////////////////////////////////////////////
+
+void main(void)
+{
+   // normlize vectors for lighting
+   vec3 normalVector = normalize(o_normal);
+   vec3 lightVector = normalize(o_lightVector);
+   // intensity of diffuse lighting [-1, 1]
+   float diffuseLighting = dot(lightVector, normalVector);
+   // map intensity of lighting from range [-1; 1] to [0, 1]
+   float interpolationValue = (1.0 + diffuseLighting)/2;
+
+   //////////////////////////////////////////////////////////////////
+
+   // cool color mixed with color of the object
+   vec3 coolColorMod = u_coolColor + vec3(u_materialDiffuse) * u_alpha;
+   // warm color mixed with color of the object
+   vec3 warmColorMod = u_warmColor + vec3(u_materialDiffuse) * u_beta;
+   // interpolation of cool and warm colors according
+   // to lighting intensity. The lower the light intensity,
+   // the larger part of the cool color is used
+   vec3 colorOut = mix(coolColorMod, warmColorMod, interpolationValue);
+
+   //////////////////////////////////////////////////////////////////
+
+   // save color
+   resultingColor.rgb = colorOut;
+   resultingColor.a = 1;
+}
+"""
+
+SILHOUETTE_VERTEX_SHADER_120 = """
+#version 120
+
+attribute vec3 a_vertex; // xyz - position
+attribute vec3 a_normal; // xyz - normal
+
+uniform mat4 u_modelMatrix;
+uniform mat4 u_viewProjectionMatrix;
+uniform mat4 u_modelViewMatrix;
+uniform vec4 u_materialDiffuse;
+uniform float u_bordersize; // width of the border
+
+varying vec4 v_color;
+
+void main(void){
+   v_color = u_materialDiffuse;
+   float distToCamera = -(u_modelViewMatrix * vec4(a_vertex, 1.0)).z;
+   vec4 tPos   = vec4(a_vertex + a_normal * u_bordersize * distToCamera, 1.0);
+   gl_Position = u_viewProjectionMatrix * u_modelMatrix * tPos;
+}
+"""
+
+SILHOUETTE_VERTEX_SHADER_130 = """
+#version 130
+
+in vec3 a_vertex; // xyz - position
+in vec3 a_normal; // xyz - normal
+
+uniform mat4 u_modelMatrix;
+uniform mat4 u_viewProjectionMatrix;
+uniform mat4 u_modelViewMatrix;
+uniform vec4 u_materialDiffuse;
+uniform float u_bordersize; // width of the border
+
+out vec4 v_color;
+
+void main(void){
+   v_color = u_materialDiffuse;
+   float distToCamera = -(u_modelViewMatrix * vec4(a_vertex, 1.0)).z;
+   vec4 tPos   = vec4(a_vertex + a_normal * u_bordersize * distToCamera, 1.0);
+   gl_Position = u_viewProjectionMatrix * u_modelMatrix * tPos;
+}
+"""
+DEFAULT_CLIP_PLANE_NEAR = 0.001
+DEFAULT_CLIP_PLANE_FAR = 1000.0
+
+
+def get_world_transform(scene, node):
+    if node == scene.rootnode:
+        return numpy.identity(4, dtype=numpy.float32)
+
+    parents = reversed(_get_parent_chain(scene, node, []))
+    parent_transform = reduce(numpy.dot, [p.transformation for p in parents])
+    return numpy.dot(parent_transform, node.transformation)
+
+
+def _get_parent_chain(scene, node, parents):
+    parent = node.parent
+
+    parents.append(parent)
+
+    if parent == scene.rootnode:
+        return parents
+
+    return _get_parent_chain(scene, parent, parents)
+
+
+class DefaultCamera:
+    def __init__(self, w, h, fov):
+        self.name = "default camera"
+        self.type = CAMERA
+        self.clipplanenear = DEFAULT_CLIP_PLANE_NEAR
+        self.clipplanefar = DEFAULT_CLIP_PLANE_FAR
+        self.aspect = w / h
+        self.horizontalfov = fov * math.pi / 180
+        self.transformation = numpy.array([[0.68, -0.32, 0.65, 7.48],
+                                           [0.73, 0.31, -0.61, -6.51],
+                                           [-0.01, 0.89, 0.44, 5.34],
+                                           [0., 0., 0., 1.]], dtype=numpy.float32)
+
+        self.transformation = numpy.dot(self.transformation, ROTATION_180_X)
+
+    def __str__(self):
+        return self.name
+
+
+class PyAssimp3DViewer:
+    base_name = "PyASSIMP 3D viewer"
+
+    def __init__(self, model, w=1024, h=768):
+
+        self.w = w
+        self.h = h
+
+        pygame.init()
+        pygame.display.set_caption(self.base_name)
+        pygame.display.set_mode((w, h), pygame.OPENGL | pygame.DOUBLEBUF)
+
+        glClearColor(0.18, 0.18, 0.18, 1.0)
+
+        shader_compilation_succeeded = False
+        try:
+            self.set_shaders_v130()
+            self.prepare_shaders()
+        except RuntimeError as message:
+            sys.stderr.write("%s\n" % message)
+            sys.stdout.write("Could not compile shaders in version 1.30, trying version 1.20\n")
+
+        if not shader_compilation_succeeded:
+            self.set_shaders_v120()
+            self.prepare_shaders()
+
+        self.scene = None
+        self.meshes = {}  # stores the OpenGL vertex/faces/normals buffers pointers
+
+        self.node2colorid = {}  # stores a color ID for each node. Useful for mouse picking and visibility checking
+        self.colorid2node = {}  # reverse dict of node2colorid
+
+        self.currently_selected = None
+        self.moving = False
+        self.moving_situation = None
+
+        self.default_camera = DefaultCamera(self.w, self.h, fov=70)
+        self.cameras = [self.default_camera]
+
+        self.current_cam_index = 0
+        self.current_cam = self.default_camera
+        self.set_camera_projection()
+
+        self.load_model(model)
+
+        # user interactions
+        self.focal_point = [0, 0, 0]
+        self.is_rotating = False
+        self.is_panning = False
+        self.is_zooming = False
+
+    def set_shaders_v120(self):
+      self.BASIC_VERTEX_SHADER = BASIC_VERTEX_SHADER_120
+      self.FLAT_VERTEX_SHADER = FLAT_VERTEX_SHADER_120
+      self.SILHOUETTE_VERTEX_SHADER = SILHOUETTE_VERTEX_SHADER_120
+      self.GOOCH_VERTEX_SHADER = GOOCH_VERTEX_SHADER_120
+
+      self.BASIC_FRAGMENT_SHADER = BASIC_FRAGMENT_SHADER_120
+      self.GOOCH_FRAGMENT_SHADER = GOOCH_FRAGMENT_SHADER_120
+
+    def set_shaders_v130(self):
+      self.BASIC_VERTEX_SHADER = BASIC_VERTEX_SHADER_130
+      self.FLAT_VERTEX_SHADER = FLAT_VERTEX_SHADER_130
+      self.SILHOUETTE_VERTEX_SHADER = SILHOUETTE_VERTEX_SHADER_130
+      self.GOOCH_VERTEX_SHADER = GOOCH_VERTEX_SHADER_130
+
+      self.BASIC_FRAGMENT_SHADER = BASIC_FRAGMENT_SHADER_130
+      self.GOOCH_FRAGMENT_SHADER = GOOCH_FRAGMENT_SHADER_130
+
+    def prepare_shaders(self):
+
+        ### Base shader
+        vertex = shaders.compileShader(self.BASIC_VERTEX_SHADER, GL_VERTEX_SHADER)
+        fragment = shaders.compileShader(self.BASIC_FRAGMENT_SHADER, GL_FRAGMENT_SHADER)
+
+        self.shader = shaders.compileProgram(vertex, fragment)
+
+        self.set_shader_accessors(('u_modelMatrix',
+                                   'u_viewProjectionMatrix',
+                                   'u_normalMatrix',
+                                   'u_lightPos',
+                                   'u_materialDiffuse'),
+                                  ('a_vertex',
+                                   'a_normal'), self.shader)
+
+        ### Flat shader
+        flatvertex = shaders.compileShader(self.FLAT_VERTEX_SHADER, GL_VERTEX_SHADER)
+        self.flatshader = shaders.compileProgram(flatvertex, fragment)
+
+        self.set_shader_accessors(('u_modelMatrix',
+                                   'u_viewProjectionMatrix',
+                                   'u_materialDiffuse',),
+                                  ('a_vertex',), self.flatshader)
+
+        ### Silhouette shader
+        silh_vertex = shaders.compileShader(self.SILHOUETTE_VERTEX_SHADER, GL_VERTEX_SHADER)
+        self.silhouette_shader = shaders.compileProgram(silh_vertex, fragment)
+
+        self.set_shader_accessors(('u_modelMatrix',
+                                   'u_viewProjectionMatrix',
+                                   'u_modelViewMatrix',
+                                   'u_materialDiffuse',
+                                   'u_bordersize'  # width of the silhouette
+                                   ),
+                                  ('a_vertex',
+                                   'a_normal'), self.silhouette_shader)
+
+        ### Gooch shader
+        gooch_vertex = shaders.compileShader(self.GOOCH_VERTEX_SHADER, GL_VERTEX_SHADER)
+        gooch_fragment = shaders.compileShader(self.GOOCH_FRAGMENT_SHADER, GL_FRAGMENT_SHADER)
+        self.gooch_shader = shaders.compileProgram(gooch_vertex, gooch_fragment)
+
+        self.set_shader_accessors(('u_modelMatrix',
+                                   'u_viewProjectionMatrix',
+                                   'u_normalMatrix',
+                                   'u_lightPos',
+                                   'u_materialDiffuse',
+                                   'u_coolColor',
+                                   'u_warmColor',
+                                   'u_alpha',
+                                   'u_beta'
+                                   ),
+                                  ('a_vertex',
+                                   'a_normal'), self.gooch_shader)
+
+    @staticmethod
+    def set_shader_accessors(uniforms, attributes, shader):
+        # add accessors to the shaders uniforms and attributes
+        for uniform in uniforms:
+            location = glGetUniformLocation(shader, uniform)
+            if location in (None, -1):
+                raise RuntimeError('No uniform: %s (maybe it is not used '
+                                   'anymore and has been optimized out by'
+                                   ' the shader compiler)' % uniform)
+            setattr(shader, uniform, location)
+
+        for attribute in attributes:
+            location = glGetAttribLocation(shader, attribute)
+            if location in (None, -1):
+                raise RuntimeError('No attribute: %s' % attribute)
+            setattr(shader, attribute, location)
+
+    @staticmethod
+    def prepare_gl_buffers(mesh):
+
+        mesh.gl = {}
+
+        # Fill the buffer for vertex and normals positions
+        v = numpy.array(mesh.vertices, 'f')
+        n = numpy.array(mesh.normals, 'f')
+
+        mesh.gl["vbo"] = vbo.VBO(numpy.hstack((v, n)))
+
+        # Fill the buffer for vertex positions
+        mesh.gl["faces"] = glGenBuffers(1)
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh.gl["faces"])
+        glBufferData(GL_ELEMENT_ARRAY_BUFFER,
+                     numpy.array(mesh.faces, dtype=numpy.int32),
+                     GL_STATIC_DRAW)
+
+        mesh.gl["nbfaces"] = len(mesh.faces)
+
+        # Unbind buffers
+        glBindBuffer(GL_ARRAY_BUFFER, 0)
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0)
+
+    @staticmethod
+    def get_rgb_from_colorid(colorid):
+        r = (colorid >> 0) & 0xff
+        g = (colorid >> 8) & 0xff
+        b = (colorid >> 16) & 0xff
+
+        return r, g, b
+
+    def get_color_id(self):
+        id = random.randint(0, 256 * 256 * 256)
+        if id not in self.colorid2node:
+            return id
+        else:
+            return self.get_color_id()
+
+    def glize(self, scene, node):
+
+        logger.info("Loading node <%s>" % node)
+        node.selected = True if self.currently_selected and self.currently_selected == node else False
+
+        node.transformation = node.transformation.astype(numpy.float32)
+
+        if node.meshes:
+            node.type = MESH
+            colorid = self.get_color_id()
+            self.colorid2node[colorid] = node
+            self.node2colorid[node.name] = colorid
+
+        elif node.name in [c.name for c in scene.cameras]:
+
+            # retrieve the ASSIMP camera object
+            [cam] = [c for c in scene.cameras if c.name == node.name]
+            node.type = CAMERA
+            logger.info("Added camera <%s>" % node.name)
+            logger.info("Camera position: %.3f, %.3f, %.3f" % tuple(node.transformation[:, 3][:3].tolist()))
+            self.cameras.append(node)
+            node.clipplanenear = cam.clipplanenear
+            node.clipplanefar = cam.clipplanefar
+
+            if numpy.allclose(cam.lookat, [0, 0, -1]) and numpy.allclose(cam.up, [0, 1, 0]):  # Cameras in .blend files
+
+                # Rotate by 180deg around X to have Z pointing forward
+                node.transformation = numpy.dot(node.transformation, ROTATION_180_X)
+            else:
+                raise RuntimeError(
+                    "I do not know how to normalize this camera orientation: lookat=%s, up=%s" % (cam.lookat, cam.up))
+
+            if cam.aspect == 0.0:
+                logger.warning("Camera aspect not set. Setting to default 4:3")
+                node.aspect = 1.333
+            else:
+                node.aspect = cam.aspect
+
+            node.horizontalfov = cam.horizontalfov
+
+        else:
+            node.type = ENTITY
+
+        for child in node.children:
+            self.glize(scene, child)
+
+    def load_model(self, path, postprocess=aiProcessPreset_TargetRealtime_MaxQuality):
+        logger.info("Loading model:" + path + "...")
+
+        if postprocess:
+            self.scene = pyassimp.load(path, processing=postprocess)
+        else:
+            self.scene = pyassimp.load(path)
+        logger.info("Done.")
+
+        scene = self.scene
+        # log some statistics
+        logger.info("  meshes: %d" % len(scene.meshes))
+        logger.info("  total faces: %d" % sum([len(mesh.faces) for mesh in scene.meshes]))
+        logger.info("  materials: %d" % len(scene.materials))
+        self.bb_min, self.bb_max = get_bounding_box(self.scene)
+        logger.info("  bounding box:" + str(self.bb_min) + " - " + str(self.bb_max))
+
+        self.scene_center = [(a + b) / 2. for a, b in zip(self.bb_min, self.bb_max)]
+
+        for index, mesh in enumerate(scene.meshes):
+            self.prepare_gl_buffers(mesh)
+
+        self.glize(scene, scene.rootnode)
+
+        # Finally release the model
+        pyassimp.release(scene)
+        logger.info("Ready for 3D rendering!")
+
+    def cycle_cameras(self):
+
+        self.current_cam_index = (self.current_cam_index + 1) % len(self.cameras)
+        self.current_cam = self.cameras[self.current_cam_index]
+        self.set_camera_projection(self.current_cam)
+        logger.info("Switched to camera <%s>" % self.current_cam)
+
+    def set_overlay_projection(self):
+        glViewport(0, 0, self.w, self.h)
+        glMatrixMode(GL_PROJECTION)
+        glLoadIdentity()
+        glOrtho(0.0, self.w - 1.0, 0.0, self.h - 1.0, -1.0, 1.0)
+        glMatrixMode(GL_MODELVIEW)
+        glLoadIdentity()
+
+    def set_camera_projection(self, camera=None):
+
+        if not camera:
+            camera = self.current_cam
+
+        znear = camera.clipplanenear or DEFAULT_CLIP_PLANE_NEAR
+        zfar = camera.clipplanefar or DEFAULT_CLIP_PLANE_FAR
+        aspect = camera.aspect
+        fov = camera.horizontalfov
+
+        glMatrixMode(GL_PROJECTION)
+        glLoadIdentity()
+
+        # Compute gl frustrum
+        tangent = math.tan(fov / 2.)
+        h = znear * tangent
+        w = h * aspect
+
+        # params: left, right, bottom, top, near, far
+        glFrustum(-w, w, -h, h, znear, zfar)
+        # equivalent to:
+        # gluPerspective(fov * 180/math.pi, aspect, znear, zfar)
+
+        self.projection_matrix = glGetFloatv(GL_PROJECTION_MATRIX).transpose()
+
+        glMatrixMode(GL_MODELVIEW)
+        glLoadIdentity()
+
+    def render_colors(self):
+
+        glEnable(GL_DEPTH_TEST)
+        glDepthFunc(GL_LEQUAL)
+
+        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL)
+        glEnable(GL_CULL_FACE)
+
+        glUseProgram(self.flatshader)
+
+        glUniformMatrix4fv(self.flatshader.u_viewProjectionMatrix, 1, GL_TRUE,
+                           numpy.dot(self.projection_matrix, self.view_matrix))
+
+        self.recursive_render(self.scene.rootnode, self.flatshader, mode=COLORS)
+
+        glUseProgram(0)
+
+    def get_hovered_node(self, mousex, mousey):
+        """
+        Attention: The performances of this method relies heavily on the size of the display!
+        """
+
+        # mouse out of the window?
+        if mousex < 0 or mousex >= self.w or mousey < 0 or mousey >= self.h:
+            return None
+
+        self.render_colors()
+        # Capture image from the OpenGL buffer
+        buf = (GLubyte * (3 * self.w * self.h))(0)
+        glReadPixels(0, 0, self.w, self.h, GL_RGB, GL_UNSIGNED_BYTE, buf)
+
+        # Reinterpret the RGB pixel buffer as a 1-D array of 24bits colors
+        a = numpy.ndarray(len(buf), numpy.dtype('>u1'), buf)
+        colors = numpy.zeros(len(buf) // 3, numpy.dtype('<u4'))
+        for i in range(3):
+            colors.view(dtype='>u1')[i::4] = a.view(dtype='>u1')[i::3]
+
+        colorid = colors[mousex + mousey * self.w]
+
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
+
+        if colorid in self.colorid2node:
+            return self.colorid2node[colorid]
+
+    def render(self, wireframe=False, twosided=False):
+
+        glEnable(GL_DEPTH_TEST)
+        glDepthFunc(GL_LEQUAL)
+
+        glPolygonMode(GL_FRONT_AND_BACK, GL_LINE if wireframe else GL_FILL)
+        glDisable(GL_CULL_FACE) if twosided else glEnable(GL_CULL_FACE)
+
+        self.render_grid()
+
+        self.recursive_render(self.scene.rootnode, None, mode=HELPERS)
+
+        ### First, the silhouette
+
+        if False:
+            shader = self.silhouette_shader
+
+            # glDepthMask(GL_FALSE)
+            glCullFace(GL_FRONT)  # cull front faces
+
+            glUseProgram(shader)
+            glUniform1f(shader.u_bordersize, 0.01)
+
+            glUniformMatrix4fv(shader.u_viewProjectionMatrix, 1, GL_TRUE,
+                               numpy.dot(self.projection_matrix, self.view_matrix))
+
+            self.recursive_render(self.scene.rootnode, shader, mode=SILHOUETTE)
+
+            glUseProgram(0)
+
+        ### Then, inner shading
+        # glDepthMask(GL_TRUE)
+        glCullFace(GL_BACK)
+
+        use_gooch = False
+        if use_gooch:
+            shader = self.gooch_shader
+
+            glUseProgram(shader)
+            glUniform3f(shader.u_lightPos, -.5, -.5, .5)
+
+            ##### GOOCH specific
+            glUniform3f(shader.u_coolColor, 159.0 / 255, 148.0 / 255, 255.0 / 255)
+            glUniform3f(shader.u_warmColor, 255.0 / 255, 75.0 / 255, 75.0 / 255)
+            glUniform1f(shader.u_alpha, .25)
+            glUniform1f(shader.u_beta, .25)
+            #########
+        else:
+            shader = self.shader
+            glUseProgram(shader)
+            glUniform3f(shader.u_lightPos, -.5, -.5, .5)
+
+        glUniformMatrix4fv(shader.u_viewProjectionMatrix, 1, GL_TRUE,
+                           numpy.dot(self.projection_matrix, self.view_matrix))
+
+        self.recursive_render(self.scene.rootnode, shader)
+
+        glUseProgram(0)
+
+    def render_axis(self,
+                    transformation=numpy.identity(4, dtype=numpy.float32),
+                    label=None,
+                    size=0.2,
+                    selected=False):
+        m = transformation.transpose()  # OpenGL row major
+
+        glPushMatrix()
+        glMultMatrixf(m)
+
+        glLineWidth(3 if selected else 1)
+
+        size = 2 * size if selected else size
+
+        glBegin(GL_LINES)
+
+        # draw line for x axis
+        glColor3f(1.0, 0.0, 0.0)
+        glVertex3f(0.0, 0.0, 0.0)
+        glVertex3f(size, 0.0, 0.0)
+
+        # draw line for y axis
+        glColor3f(0.0, 1.0, 0.0)
+        glVertex3f(0.0, 0.0, 0.0)
+        glVertex3f(0.0, size, 0.0)
+
+        # draw line for Z axis
+        glColor3f(0.0, 0.0, 1.0)
+        glVertex3f(0.0, 0.0, 0.0)
+        glVertex3f(0.0, 0.0, size)
+
+        glEnd()
+
+        if label:
+            self.showtext(label)
+
+        glPopMatrix()
+
+    @staticmethod
+    def render_camera(camera, transformation):
+
+        m = transformation.transpose()  # OpenGL row major
+
+        aspect = camera.aspect
+
+        u = 0.1  # unit size (in m)
+        l = 3 * u  # length of the camera cone
+        f = 3 * u  # aperture of the camera cone
+
+        glPushMatrix()
+        glMultMatrixf(m)
+
+        glLineWidth(2)
+        glBegin(GL_LINE_STRIP)
+
+        glColor3f(.2, .2, .2)
+
+        glVertex3f(u, u, -u)
+        glVertex3f(u, -u, -u)
+        glVertex3f(-u, -u, -u)
+        glVertex3f(-u, u, -u)
+        glVertex3f(u, u, -u)
+
+        glVertex3f(u, u, 0.0)
+        glVertex3f(u, -u, 0.0)
+        glVertex3f(-u, -u, 0.0)
+        glVertex3f(-u, u, 0.0)
+        glVertex3f(u, u, 0.0)
+
+        glVertex3f(f * aspect, f, l)
+        glVertex3f(f * aspect, -f, l)
+        glVertex3f(-f * aspect, -f, l)
+        glVertex3f(-f * aspect, f, l)
+        glVertex3f(f * aspect, f, l)
+
+        glEnd()
+
+        glBegin(GL_LINE_STRIP)
+        glVertex3f(u, -u, -u)
+        glVertex3f(u, -u, 0.0)
+        glVertex3f(f * aspect, -f, l)
+        glEnd()
+
+        glBegin(GL_LINE_STRIP)
+        glVertex3f(-u, -u, -u)
+        glVertex3f(-u, -u, 0.0)
+        glVertex3f(-f * aspect, -f, l)
+        glEnd()
+
+        glBegin(GL_LINE_STRIP)
+        glVertex3f(-u, u, -u)
+        glVertex3f(-u, u, 0.0)
+        glVertex3f(-f * aspect, f, l)
+        glEnd()
+
+        glPopMatrix()
+
+    @staticmethod
+    def render_grid():
+
+        glLineWidth(1)
+        glColor3f(0.5, 0.5, 0.5)
+        glBegin(GL_LINES)
+        for i in range(-10, 11):
+            glVertex3f(i, -10.0, 0.0)
+            glVertex3f(i, 10.0, 0.0)
+
+        for i in range(-10, 11):
+            glVertex3f(-10.0, i, 0.0)
+            glVertex3f(10.0, i, 0.0)
+        glEnd()
+
+    def recursive_render(self, node, shader, mode=BASE, with_normals=True):
+        """ Main recursive rendering method.
+        """
+
+        normals = with_normals
+
+        if mode == COLORS:
+            normals = False
+
+
+        if not hasattr(node, "selected"):
+            node.selected = False
+
+        m = get_world_transform(self.scene, node)
+
+        # HELPERS mode
+        ###
+        if mode == HELPERS:
+            # if node.type == ENTITY:
+            self.render_axis(m,
+                             label=node.name if node != self.scene.rootnode else None,
+                             selected=node.selected if hasattr(node, "selected") else False)
+
+            if node.type == CAMERA:
+                self.render_camera(node, m)
+
+            for child in node.children:
+                    self.recursive_render(child, shader, mode)
+
+            return
+
+        # Mesh rendering modes
+        ###
+        if node.type == MESH:
+
+            for mesh in node.meshes:
+
+                stride = 24  # 6 * 4 bytes
+
+                if node.selected and mode == SILHOUETTE:
+                    glUniform4f(shader.u_materialDiffuse, 1.0, 0.0, 0.0, 1.0)
+                    glUniformMatrix4fv(shader.u_modelViewMatrix, 1, GL_TRUE,
+                                       numpy.dot(self.view_matrix, m))
+
+                else:
+                    if mode == COLORS:
+                        colorid = self.node2colorid[node.name]
+                        r, g, b = self.get_rgb_from_colorid(colorid)
+                        glUniform4f(shader.u_materialDiffuse, r / 255.0, g / 255.0, b / 255.0, 1.0)
+                    elif mode == SILHOUETTE:
+                        glUniform4f(shader.u_materialDiffuse, .0, .0, .0, 1.0)
+                    else:
+                        if node.selected:
+                            diffuse = (1.0, 0.0, 0.0, 1.0)  # selected nodes in red
+                        else:
+                            diffuse = mesh.material.properties["diffuse"]
+                        if len(diffuse) == 3:  # RGB instead of expected RGBA
+                            diffuse.append(1.0)
+                        glUniform4f(shader.u_materialDiffuse, *diffuse)
+                        # if ambient:
+                        #    glUniform4f( shader.Material_ambient, *mat["ambient"] )
+
+                if mode == BASE:  # not in COLORS or SILHOUETTE
+                    normal_matrix = linalg.inv(numpy.dot(self.view_matrix, m)[0:3, 0:3]).transpose()
+                    glUniformMatrix3fv(shader.u_normalMatrix, 1, GL_TRUE, normal_matrix)
+
+                glUniformMatrix4fv(shader.u_modelMatrix, 1, GL_TRUE, m)
+
+                vbo = mesh.gl["vbo"]
+                vbo.bind()
+
+                glEnableVertexAttribArray(shader.a_vertex)
+                if normals:
+                    glEnableVertexAttribArray(shader.a_normal)
+
+                glVertexAttribPointer(
+                    shader.a_vertex,
+                    3, GL_FLOAT, False, stride, vbo
+                )
+
+                if normals:
+                    glVertexAttribPointer(
+                        shader.a_normal,
+                        3, GL_FLOAT, False, stride, vbo + 12
+                    )
+
+                glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh.gl["faces"])
+                glDrawElements(GL_TRIANGLES, mesh.gl["nbfaces"] * 3, GL_UNSIGNED_INT, None)
+
+                vbo.unbind()
+                glDisableVertexAttribArray(shader.a_vertex)
+
+                if normals:
+                    glDisableVertexAttribArray(shader.a_normal)
+
+                glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0)
+
+        for child in node.children:
+            self.recursive_render(child, shader, mode)
+
+
+    def switch_to_overlay(self):
+        glPushMatrix()
+        self.set_overlay_projection()
+
+    def switch_from_overlay(self):
+        self.set_camera_projection()
+        glPopMatrix()
+
+    def select_node(self, node):
+        self.currently_selected = node
+        self.update_node_select(self.scene.rootnode)
+
+    def update_node_select(self, node):
+        if node is self.currently_selected:
+            node.selected = True
+        else:
+            node.selected = False
+
+        for child in node.children:
+            self.update_node_select(child)
+
+    def loop(self):
+
+        pygame.display.flip()
+
+        if not self.process_events():
+            return False  # ESC has been pressed
+
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
+
+        return True
+
+    def process_events(self):
+
+        LEFT_BUTTON = 1
+        MIDDLE_BUTTON = 2
+        RIGHT_BUTTON = 3
+        WHEEL_UP = 4
+        WHEEL_DOWN = 5
+
+        dx, dy = pygame.mouse.get_rel()
+        mousex, mousey = pygame.mouse.get_pos()
+
+        zooming_one_shot = False
+
+        ok = True
+
+        for evt in pygame.event.get():
+            if evt.type == pygame.MOUSEBUTTONDOWN and evt.button == LEFT_BUTTON:
+                hovered = self.get_hovered_node(mousex, self.h - mousey)
+                if hovered:
+                    if self.currently_selected and self.currently_selected == hovered:
+                        self.select_node(None)
+                    else:
+                        logger.info("Node %s selected" % hovered)
+                        self.select_node(hovered)
+                else:
+                    self.is_rotating = True
+            if evt.type == pygame.MOUSEBUTTONUP and evt.button == LEFT_BUTTON:
+                self.is_rotating = False
+
+            if evt.type == pygame.MOUSEBUTTONDOWN and evt.button == MIDDLE_BUTTON:
+                self.is_panning = True
+            if evt.type == pygame.MOUSEBUTTONUP and evt.button == MIDDLE_BUTTON:
+                self.is_panning = False
+
+            if evt.type == pygame.MOUSEBUTTONDOWN and evt.button == RIGHT_BUTTON:
+                self.is_zooming = True
+            if evt.type == pygame.MOUSEBUTTONUP and evt.button == RIGHT_BUTTON:
+                self.is_zooming = False
+
+            if evt.type == pygame.MOUSEBUTTONDOWN and evt.button in [WHEEL_UP, WHEEL_DOWN]:
+                zooming_one_shot = True
+                self.is_zooming = True
+                dy = -10 if evt.button == WHEEL_UP else 10
+
+            if evt.type == pygame.KEYDOWN:
+                ok = (ok and self.process_keystroke(evt.key, evt.mod))
+
+        self.controls_3d(dx, dy, zooming_one_shot)
+
+        return ok
+
+    def process_keystroke(self, key, mod):
+
+        # process arrow keys if an object is selected
+        if self.currently_selected:
+            up = 0
+            strafe = 0
+
+            if key == pygame.K_UP:
+                up = 1
+            if key == pygame.K_DOWN:
+                up = -1
+            if key == pygame.K_LEFT:
+                strafe = -1
+            if key == pygame.K_RIGHT:
+                strafe = 1
+
+            self.move_selected_node(up, strafe)
+
+        if key == pygame.K_f:
+            pygame.display.toggle_fullscreen()
+
+        if key == pygame.K_TAB:
+            self.cycle_cameras()
+
+        if key in [pygame.K_ESCAPE, pygame.K_q]:
+            return False
+
+        return True
+
+    def controls_3d(self, dx, dy, zooming_one_shot=False):
+        """ Orbiting the camera is implemented the following way:
+
+        - the rotation is split into a rotation around the *world* Z axis
+          (controlled by the horizontal mouse motion along X) and a
+          rotation around the *X* axis of the camera (pitch) *shifted to
+          the focal origin* (the world origin for now). This is controlled
+          by the vertical motion of the mouse (Y axis).
+        - as a result, the resulting transformation of the camera in the
+          world frame C' is:
+            C' = (T · Rx · T⁻¹ · (Rz · C)⁻¹)⁻¹
+          where:
+          - C is the original camera transformation in the world frame,
+          - Rz is the rotation along the Z axis (in the world frame)
+          - T is the translation camera -> world (ie, the inverse of the
+            translation part of C
+          - Rx is the rotation around X in the (translated) camera frame """
+
+        CAMERA_TRANSLATION_FACTOR = 0.01
+        CAMERA_ROTATION_FACTOR = 0.01
+
+        if not (self.is_rotating or self.is_panning or self.is_zooming):
+            return
+
+        current_pos = self.current_cam.transformation[:3, 3].copy()
+        distance = numpy.linalg.norm(self.focal_point - current_pos)
+
+        if self.is_rotating:
+            rotation_camera_x = dy * CAMERA_ROTATION_FACTOR
+            rotation_world_z = dx * CAMERA_ROTATION_FACTOR
+            world_z_rotation = transformations.euler_matrix(0, 0, rotation_world_z)
+            cam_x_rotation = transformations.euler_matrix(rotation_camera_x, 0, 0)
+
+            after_world_z_rotation = numpy.dot(world_z_rotation, self.current_cam.transformation)
+
+            inverse_transformation = transformations.inverse_matrix(after_world_z_rotation)
+
+            translation = transformations.translation_matrix(
+                transformations.decompose_matrix(inverse_transformation)[3])
+            inverse_translation = transformations.inverse_matrix(translation)
+
+            new_inverse = numpy.dot(inverse_translation, inverse_transformation)
+            new_inverse = numpy.dot(cam_x_rotation, new_inverse)
+            new_inverse = numpy.dot(translation, new_inverse)
+
+            self.current_cam.transformation = transformations.inverse_matrix(new_inverse).astype(numpy.float32)
+
+        if self.is_panning:
+            tx = -dx * CAMERA_TRANSLATION_FACTOR * distance
+            ty = dy * CAMERA_TRANSLATION_FACTOR * distance
+            cam_transform = transformations.translation_matrix((tx, ty, 0)).astype(numpy.float32)
+            self.current_cam.transformation = numpy.dot(self.current_cam.transformation, cam_transform)
+
+        if self.is_zooming:
+            tz = dy * CAMERA_TRANSLATION_FACTOR * distance
+            cam_transform = transformations.translation_matrix((0, 0, tz)).astype(numpy.float32)
+            self.current_cam.transformation = numpy.dot(self.current_cam.transformation, cam_transform)
+
+        if zooming_one_shot:
+            self.is_zooming = False
+
+        self.update_view_camera()
+
+    def update_view_camera(self):
+
+        self.view_matrix = linalg.inv(self.current_cam.transformation)
+
+        # Rotate by 180deg around X to have Z pointing backward (OpenGL convention)
+        self.view_matrix = numpy.dot(ROTATION_180_X, self.view_matrix)
+
+        glMatrixMode(GL_MODELVIEW)
+        glLoadIdentity()
+        glMultMatrixf(self.view_matrix.transpose())
+
+    def move_selected_node(self, up, strafe):
+        self.currently_selected.transformation[0][3] += strafe
+        self.currently_selected.transformation[2][3] += up
+
+    @staticmethod
+    def showtext(text, x=0, y=0, z=0, size=20):
+
+        # TODO: alpha blending does not work...
+        # glEnable(GL_BLEND)
+        # glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
+
+        font = pygame.font.Font(None, size)
+        text_surface = font.render(text, True, (10, 10, 10, 255),
+                                  (255 * 0.18, 255 * 0.18, 255 * 0.18, 0))
+        text_data = pygame.image.tostring(text_surface, "RGBA", True)
+        glRasterPos3d(x, y, z)
+        glDrawPixels(text_surface.get_width(),
+                     text_surface.get_height(),
+                     GL_RGBA, GL_UNSIGNED_BYTE,
+                     text_data)
+
+        # glDisable(GL_BLEND)
+
+
+def main(model, width, height):
+    app = PyAssimp3DViewer(model, w=width, h=height)
+
+    clock = pygame.time.Clock()
+
+    while app.loop():
+
+        app.update_view_camera()
+
+        ## Main rendering
+        app.render()
+
+        ## GUI text display
+        app.switch_to_overlay()
+        app.showtext("Active camera: %s" % str(app.current_cam), 10, app.h - 30)
+        if app.currently_selected:
+            app.showtext("Selected node: %s" % app.currently_selected, 10, app.h - 50)
+            pos = app.h - 70
+
+            app.showtext("(%sm, %sm, %sm)" % (app.currently_selected.transformation[0, 3],
+                                              app.currently_selected.transformation[1, 3],
+                                              app.currently_selected.transformation[2, 3]), 30, pos)
+
+        app.switch_from_overlay()
+
+        # Make sure we do not go over 30fps
+        clock.tick(30)
+
+    logger.info("Quitting! Bye bye!")
+
+
+#########################################################################
+#########################################################################
+
+if __name__ == '__main__':
+    if not len(sys.argv) > 1:
+        print("Usage: " + __file__ + " <model>")
+        sys.exit(2)
+
+    main(model=sys.argv[1], width=1024, height=768)
diff --git a/libs/assimp/port/PyAssimp/scripts/README.md b/libs/assimp/port/PyAssimp/scripts/README.md
new file mode 100644
index 0000000..42caa27
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/scripts/README.md
@@ -0,0 +1,13 @@
+pyassimp examples
+=================
+
+- `sample.py`: shows how to load a model with pyassimp, and display some statistics.
+- `3d_viewer.py`: an OpenGL 3D viewer that requires shaders
+- `fixed_pipeline_3d_viewer`: an OpenGL 3D viewer using the old fixed-pipeline.
+  Only for illustration example. Base new projects on `3d_viewer.py`.
+
+
+Requirements for the 3D viewers:
+
+- `pyopengl` (on Ubuntu/Debian, `sudo apt-get install python-opengl`)
+- `pygame` (on Ubuntu/Debian, `sudo apt-get install python-pygame`)
diff --git a/libs/assimp/port/PyAssimp/scripts/fixed_pipeline_3d_viewer.py b/libs/assimp/port/PyAssimp/scripts/fixed_pipeline_3d_viewer.py
new file mode 100755
index 0000000..c2f6ceb
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/scripts/fixed_pipeline_3d_viewer.py
@@ -0,0 +1,372 @@
+#!/usr/bin/env python
+#-*- coding: UTF-8 -*-
+
+""" This program demonstrates the use of pyassimp to load and
+render objects with OpenGL.
+
+'c' cycles between cameras (if any available)
+'q' to quit
+
+This example mixes 'old' OpenGL fixed-function pipeline with 
+Vertex Buffer Objects.
+
+Materials are supported but textures are currently ignored.
+
+For a more advanced example (with shaders + keyboard/mouse 
+controls), check scripts/sdl_viewer.py
+
+Author: Séverin Lemaignan, 2012
+
+This sample is based on several sources, including:
+ - http://www.lighthouse3d.com/tutorials
+ - http://www.songho.ca/opengl/gl_transform.html
+ - http://code.activestate.com/recipes/325391/
+ - ASSIMP's C++ SimpleOpenGL viewer
+"""
+
+import sys
+from OpenGL.GLUT import *
+from OpenGL.GLU import *
+from OpenGL.GL import *
+
+import logging
+logger = logging.getLogger("pyassimp_opengl")
+logging.basicConfig(level=logging.INFO)
+
+import math
+import numpy
+
+import pyassimp
+from pyassimp.postprocess import *
+from pyassimp.helper import *
+
+
+name = 'pyassimp OpenGL viewer'
+height = 600
+width = 900
+
+class GLRenderer():
+    def __init__(self):
+
+        self.scene = None
+
+        self.using_fixed_cam = False
+        self.current_cam_index = 0
+
+        # store the global scene rotation
+        self.angle = 0.
+
+        # for FPS calculation
+        self.prev_time = 0
+        self.prev_fps_time = 0
+        self.frames = 0
+
+    def prepare_gl_buffers(self, mesh):
+        """ Creates 3 buffer objets for each mesh, 
+        to store the vertices, the normals, and the faces
+        indices.
+        """
+
+        mesh.gl = {}
+
+        # Fill the buffer for vertex positions
+        mesh.gl["vertices"] = glGenBuffers(1)
+        glBindBuffer(GL_ARRAY_BUFFER, mesh.gl["vertices"])
+        glBufferData(GL_ARRAY_BUFFER, 
+                    mesh.vertices,
+                    GL_STATIC_DRAW)
+
+        # Fill the buffer for normals
+        mesh.gl["normals"] = glGenBuffers(1)
+        glBindBuffer(GL_ARRAY_BUFFER, mesh.gl["normals"])
+        glBufferData(GL_ARRAY_BUFFER, 
+                    mesh.normals,
+                    GL_STATIC_DRAW)
+
+
+        # Fill the buffer for vertex positions
+        mesh.gl["triangles"] = glGenBuffers(1)
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh.gl["triangles"])
+        glBufferData(GL_ELEMENT_ARRAY_BUFFER, 
+                    mesh.faces,
+                    GL_STATIC_DRAW)
+
+        # Unbind buffers
+        glBindBuffer(GL_ARRAY_BUFFER,0)
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,0)
+
+    def load_model(self, path, postprocess = None):
+        logger.info("Loading model:" + path + "...")
+
+        if postprocess:
+            self.scene = pyassimp.load(path, processing=postprocess)
+        else:
+            self.scene = pyassimp.load(path)
+        logger.info("Done.")
+
+        scene = self.scene
+        #log some statistics
+        logger.info("  meshes: %d" % len(scene.meshes))
+        logger.info("  total faces: %d" % sum([len(mesh.faces) for mesh in scene.meshes]))
+        logger.info("  materials: %d" % len(scene.materials))
+        self.bb_min, self.bb_max = get_bounding_box(self.scene)
+        logger.info("  bounding box:" + str(self.bb_min) + " - " + str(self.bb_max))
+
+        self.scene_center = [(a + b) / 2. for a, b in zip(self.bb_min, self.bb_max)]
+
+        for index, mesh in enumerate(scene.meshes):
+            self.prepare_gl_buffers(mesh)
+
+        # Finally release the model
+        pyassimp.release(scene)
+
+    def cycle_cameras(self):
+        self.current_cam_index
+        if not self.scene.cameras:
+            return None
+        self.current_cam_index = (self.current_cam_index + 1) % len(self.scene.cameras)
+        cam = self.scene.cameras[self.current_cam_index]
+        logger.info("Switched to camera " + str(cam))
+        return cam
+
+    def set_default_camera(self):
+
+        if not self.using_fixed_cam:
+            glLoadIdentity()
+
+            gluLookAt(0.,0.,3.,
+                      0.,0.,-5.,
+                      0.,1.,0.)
+
+
+
+    def set_camera(self, camera):
+
+        if not camera:
+            return
+
+        self.using_fixed_cam = True
+
+        znear = camera.clipplanenear
+        zfar = camera.clipplanefar
+        aspect = camera.aspect
+        fov = camera.horizontalfov
+
+        glMatrixMode(GL_PROJECTION)
+        glLoadIdentity()
+
+        # Compute gl frustrum
+        tangent = math.tan(fov/2.)
+        h = znear * tangent
+        w = h * aspect
+
+        # params: left, right, bottom, top, near, far
+        glFrustum(-w, w, -h, h, znear, zfar)
+        # equivalent to:
+        #gluPerspective(fov * 180/math.pi, aspect, znear, zfar)
+
+        glMatrixMode(GL_MODELVIEW)
+        glLoadIdentity()
+
+        cam = transform(camera.position, camera.transformation)
+        at = transform(camera.lookat, camera.transformation)
+        gluLookAt(cam[0], cam[2], -cam[1],
+                   at[0],  at[2],  -at[1],
+                       0,      1,       0)
+
+    def fit_scene(self, restore = False):
+        """ Compute a scale factor and a translation to fit and center 
+        the whole geometry on the screen.
+        """
+
+        x_max = self.bb_max[0] - self.bb_min[0]
+        y_max = self.bb_max[1] - self.bb_min[1]
+        tmp = max(x_max, y_max)
+        z_max = self.bb_max[2] - self.bb_min[2]
+        tmp = max(z_max, tmp)
+
+        if not restore:
+            tmp = 1. / tmp
+
+        logger.info("Scaling the scene by %.03f" % tmp)
+        glScalef(tmp, tmp, tmp)
+
+        # center the model
+        direction = -1 if not restore else 1
+        glTranslatef( direction * self.scene_center[0], 
+                      direction * self.scene_center[1], 
+                      direction * self.scene_center[2] )
+
+        return x_max, y_max, z_max
+
+    def apply_material(self, mat):
+        """ Apply an OpenGL, using one OpenGL display list per material to cache 
+        the operation.
+        """
+
+        if not hasattr(mat, "gl_mat"): # evaluate once the mat properties, and cache the values in a glDisplayList.
+            diffuse = numpy.array(mat.properties.get("diffuse", [0.8, 0.8, 0.8, 1.0]))
+            specular = numpy.array(mat.properties.get("specular", [0., 0., 0., 1.0]))
+            ambient = numpy.array(mat.properties.get("ambient", [0.2, 0.2, 0.2, 1.0]))
+            emissive = numpy.array(mat.properties.get("emissive", [0., 0., 0., 1.0]))
+            shininess = min(mat.properties.get("shininess", 1.0), 128)
+            wireframe = mat.properties.get("wireframe", 0)
+            twosided = mat.properties.get("twosided", 1)
+
+            setattr(mat, "gl_mat", glGenLists(1))
+            glNewList(mat.gl_mat, GL_COMPILE)
+    
+            glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, diffuse)
+            glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specular)
+            glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, ambient)
+            glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, emissive)
+            glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, shininess)
+            glPolygonMode(GL_FRONT_AND_BACK, GL_LINE if wireframe else GL_FILL)
+            glDisable(GL_CULL_FACE) if twosided else glEnable(GL_CULL_FACE)
+    
+            glEndList()
+    
+        glCallList(mat.gl_mat)
+
+    
+   
+    def do_motion(self):
+
+        gl_time = glutGet(GLUT_ELAPSED_TIME)
+
+        self.angle = (gl_time - self.prev_time) * 0.1
+
+        self.prev_time = gl_time
+
+        # Compute FPS
+        self.frames += 1
+        if gl_time - self.prev_fps_time >= 1000:
+            current_fps = self.frames * 1000 / (gl_time - self.prev_fps_time)
+            logger.info('%.0f fps' % current_fps)
+            self.frames = 0
+            self.prev_fps_time = gl_time
+
+        glutPostRedisplay()
+
+    def recursive_render(self, node):
+        """ Main recursive rendering method.
+        """
+
+        # save model matrix and apply node transformation
+        glPushMatrix()
+        m = node.transformation.transpose() # OpenGL row major
+        glMultMatrixf(m)
+
+        for mesh in node.meshes:
+            self.apply_material(mesh.material)
+
+            glBindBuffer(GL_ARRAY_BUFFER, mesh.gl["vertices"])
+            glEnableClientState(GL_VERTEX_ARRAY)
+            glVertexPointer(3, GL_FLOAT, 0, None)
+
+            glBindBuffer(GL_ARRAY_BUFFER, mesh.gl["normals"])
+            glEnableClientState(GL_NORMAL_ARRAY)
+            glNormalPointer(GL_FLOAT, 0, None)
+
+            glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh.gl["triangles"])
+            glDrawElements(GL_TRIANGLES,len(mesh.faces) * 3, GL_UNSIGNED_INT, None)
+
+            glDisableClientState(GL_VERTEX_ARRAY)
+            glDisableClientState(GL_NORMAL_ARRAY)
+
+            glBindBuffer(GL_ARRAY_BUFFER, 0)
+            glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0)
+
+        for child in node.children:
+            self.recursive_render(child)
+
+        glPopMatrix()
+
+
+    def display(self):
+        """ GLUT callback to redraw OpenGL surface
+        """
+        glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
+
+        glRotatef(self.angle,0.,1.,0.)
+        self.recursive_render(self.scene.rootnode)
+
+        glutSwapBuffers()
+        self.do_motion()
+        return
+
+    ####################################################################
+    ##               GLUT keyboard and mouse callbacks                ##
+    ####################################################################
+    def onkeypress(self, key, x, y):
+        if key == 'c':
+            self.fit_scene(restore = True)
+            self.set_camera(self.cycle_cameras())
+        if key == 'q':
+            sys.exit(0)
+
+    def render(self, filename=None, fullscreen = False, autofit = True, postprocess = None):
+        """
+
+        :param autofit: if true, scale the scene to fit the whole geometry
+        in the viewport.
+        """
+    
+        # First initialize the openGL context
+        glutInit(sys.argv)
+        glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH)
+        if not fullscreen:
+            glutInitWindowSize(width, height)
+            glutCreateWindow(name)
+        else:
+            glutGameModeString("1024x768")
+            if glutGameModeGet(GLUT_GAME_MODE_POSSIBLE):
+                glutEnterGameMode()
+            else:
+                print("Fullscreen mode not available!")
+                sys.exit(1)
+
+        self.load_model(filename, postprocess = postprocess)
+
+
+        glClearColor(0.1,0.1,0.1,1.)
+        #glShadeModel(GL_SMOOTH)
+
+        glEnable(GL_LIGHTING)
+
+        glEnable(GL_CULL_FACE)
+        glEnable(GL_DEPTH_TEST)
+
+        glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE)
+        glEnable(GL_NORMALIZE)
+        glEnable(GL_LIGHT0)
+
+        glutDisplayFunc(self.display)
+
+
+        glMatrixMode(GL_PROJECTION)
+        glLoadIdentity()
+        gluPerspective(35.0, width/float(height) , 0.10, 100.0)
+        glMatrixMode(GL_MODELVIEW)
+        self.set_default_camera()
+
+        if autofit:
+            # scale the whole asset to fit into our view frustum·
+            self.fit_scene()
+
+        glPushMatrix()
+
+        glutKeyboardFunc(self.onkeypress)
+        glutIgnoreKeyRepeat(1)
+
+        glutMainLoop()
+
+
+if __name__ == '__main__':
+    if not len(sys.argv) > 1:
+        print("Usage: " + __file__ + " <model>")
+        sys.exit(0)
+
+    glrender = GLRenderer()
+    glrender.render(sys.argv[1], fullscreen = False, postprocess = aiProcessPreset_TargetRealtime_MaxQuality)
+
diff --git a/libs/assimp/port/PyAssimp/scripts/quicktest.py b/libs/assimp/port/PyAssimp/scripts/quicktest.py
new file mode 100755
index 0000000..cbeccb4
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/scripts/quicktest.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+#-*- coding: UTF-8 -*-
+
+"""
+This module uses the sample.py script to load all test models it finds.
+
+Note: this is not an exhaustive test suite, it does not check the
+data structures in detail. It just verifies whether basic
+loading and querying of 3d models using pyassimp works.
+"""
+
+import os
+import sys
+
+# Make the development (ie. GIT repo) version of PyAssimp available for import.
+sys.path.insert(0, '..')
+
+import sample
+from pyassimp import errors
+
+# Paths to model files.
+basepaths = [os.path.join('..', '..', '..', 'test', 'models'),
+             os.path.join('..', '..', '..', 'test', 'models-nonbsd')]
+
+# Valid extensions for 3D model files.
+extensions = ['.3ds', '.x', '.lwo', '.obj', '.md5mesh', '.dxf', '.ply', '.stl',
+              '.dae', '.md5anim', '.lws', '.irrmesh', '.nff', '.off', '.blend']
+
+
+def run_tests():
+    ok, err = 0, 0
+    for path in basepaths:
+        print("Looking for models in %s..." % path)
+        for root, dirs, files in os.walk(path):
+            for afile in files:
+                base, ext = os.path.splitext(afile)
+                if ext in extensions:
+                    try:
+                        sample.main(os.path.join(root, afile))
+                        ok += 1
+                    except errors.AssimpError as error:
+                        # Assimp error is fine; this is a controlled case.
+                        print(error)
+                        err += 1
+                    except Exception:
+                        print("Error encountered while loading <%s>"
+                              % os.path.join(root, afile))
+    print('** Loaded %s models, got controlled errors for %s files'
+          % (ok, err))
+
+
+if __name__ == '__main__':
+    run_tests()
diff --git a/libs/assimp/port/PyAssimp/scripts/sample.py b/libs/assimp/port/PyAssimp/scripts/sample.py
new file mode 100755
index 0000000..3cd4b3e
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/scripts/sample.py
@@ -0,0 +1,89 @@
+#!/usr/bin/env python
+#-*- coding: UTF-8 -*-
+
+"""
+This module demonstrates the functionality of PyAssimp.
+"""
+
+import sys
+import logging
+logging.basicConfig(level=logging.INFO)
+
+import pyassimp
+import pyassimp.postprocess
+
+def recur_node(node,level = 0):
+    print("  " + "\t" * level + "- " + str(node))
+    for child in node.children:
+        recur_node(child, level + 1)
+
+
+def main(filename=None):
+
+    scene = pyassimp.load(filename, processing=pyassimp.postprocess.aiProcess_Triangulate)
+    
+    #the model we load
+    print("MODEL:" + filename)
+    print
+    
+    #write some statistics
+    print("SCENE:")
+    print("  meshes:" + str(len(scene.meshes)))
+    print("  materials:" + str(len(scene.materials)))
+    print("  textures:" + str(len(scene.textures)))
+    print
+    
+    print("NODES:")
+    recur_node(scene.rootnode)
+
+    print
+    print("MESHES:")
+    for index, mesh in enumerate(scene.meshes):
+        print("  MESH" + str(index+1))
+        print("    material id:" + str(mesh.materialindex+1))
+        print("    vertices:" + str(len(mesh.vertices)))
+        print("    first 3 verts:\n" + str(mesh.vertices[:3]))
+        if mesh.normals.any():
+                print("    first 3 normals:\n" + str(mesh.normals[:3]))
+        else:
+                print("    no normals")
+        print("    colors:" + str(len(mesh.colors)))
+        tcs = mesh.texturecoords
+        if tcs.any():
+            for tc_index, tc in enumerate(tcs):
+                print("    texture-coords "+ str(tc_index) + ":" + str(len(tcs[tc_index])) + "first3:" + str(tcs[tc_index][:3]))
+
+        else:
+            print("    no texture coordinates")
+        print("    uv-component-count:" + str(len(mesh.numuvcomponents)))
+        print("    faces:" + str(len(mesh.faces)) + " -> first:\n" + str(mesh.faces[:3]))
+        print("    bones:" + str(len(mesh.bones)) + " -> first:" + str([str(b) for b in mesh.bones[:3]]))
+        print
+
+    print("MATERIALS:")
+    for index, material in enumerate(scene.materials):
+        print("  MATERIAL (id:" + str(index+1) + ")")
+        for key, value in material.properties.items():
+            print("    %s: %s" % (key, value))
+    print
+    
+    print("TEXTURES:")
+    for index, texture in enumerate(scene.textures):
+        print("  TEXTURE" + str(index+1))
+        print("    width:" + str(texture.width))
+        print("    height:" + str(texture.height))
+        print("    hint:" + str(texture.achformathint))
+        print("    data (size):" + str(len(texture.data)))
+   
+    # Finally release the model
+    pyassimp.release(scene)
+
+def usage():
+    print("Usage: sample.py <3d model>")
+
+if __name__ == "__main__":
+
+    if len(sys.argv) != 2:
+        usage()
+    else:
+        main(sys.argv[1])
diff --git a/libs/assimp/port/PyAssimp/scripts/transformations.py b/libs/assimp/port/PyAssimp/scripts/transformations.py
new file mode 100644
index 0000000..bf0cac9
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/scripts/transformations.py
@@ -0,0 +1,1705 @@
+# -*- coding: utf-8 -*-
+# transformations.py
+
+# Copyright (c) 2006, Christoph Gohlke
+# Copyright (c) 2006-2009, The Regents of the University of California
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# * Redistributions of source code must retain the above copyright
+#   notice, this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above copyright
+#   notice, this list of conditions and the following disclaimer in the
+#   documentation and/or other materials provided with the distribution.
+# * Neither the name of the copyright holders nor the names of any
+#   contributors may be used to endorse or promote products derived
+#   from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
+"""Homogeneous Transformation Matrices and Quaternions.
+
+A library for calculating 4x4 matrices for translating, rotating, reflecting,
+scaling, shearing, projecting, orthogonalizing, and superimposing arrays of
+3D homogeneous coordinates as well as for converting between rotation matrices,
+Euler angles, and quaternions. Also includes an Arcball control object and
+functions to decompose transformation matrices.
+
+:Authors:
+  `Christoph Gohlke <http://www.lfd.uci.edu/~gohlke/>`__,
+  Laboratory for Fluorescence Dynamics, University of California, Irvine
+
+:Version: 20090418
+
+Requirements
+------------
+
+* `Python 2.6 <http://www.python.org>`__
+* `Numpy 1.3 <http://numpy.scipy.org>`__
+* `transformations.c 20090418 <http://www.lfd.uci.edu/~gohlke/>`__
+  (optional implementation of some functions in C)
+
+Notes
+-----
+
+Matrices (M) can be inverted using numpy.linalg.inv(M), concatenated using
+numpy.dot(M0, M1), or used to transform homogeneous coordinates (v) using
+numpy.dot(M, v) for shape (4, \*) "point of arrays", respectively
+numpy.dot(v, M.T) for shape (\*, 4) "array of points".
+
+Calculations are carried out with numpy.float64 precision.
+
+This Python implementation is not optimized for speed.
+
+Vector, point, quaternion, and matrix function arguments are expected to be
+"array like", i.e. tuple, list, or numpy arrays.
+
+Return types are numpy arrays unless specified otherwise.
+
+Angles are in radians unless specified otherwise.
+
+Quaternions ix+jy+kz+w are represented as [x, y, z, w].
+
+Use the transpose of transformation matrices for OpenGL glMultMatrixd().
+
+A triple of Euler angles can be applied/interpreted in 24 ways, which can
+be specified using a 4 character string or encoded 4-tuple:
+
+  *Axes 4-string*: e.g. 'sxyz' or 'ryxy'
+
+  - first character : rotations are applied to 's'tatic or 'r'otating frame
+  - remaining characters : successive rotation axis 'x', 'y', or 'z'
+
+  *Axes 4-tuple*: e.g. (0, 0, 0, 0) or (1, 1, 1, 1)
+
+  - inner axis: code of axis ('x':0, 'y':1, 'z':2) of rightmost matrix.
+  - parity : even (0) if inner axis 'x' is followed by 'y', 'y' is followed
+    by 'z', or 'z' is followed by 'x'. Otherwise odd (1).
+  - repetition : first and last axis are same (1) or different (0).
+  - frame : rotations are applied to static (0) or rotating (1) frame.
+
+References
+----------
+
+(1)  Matrices and transformations. Ronald Goldman.
+     In "Graphics Gems I", pp 472-475. Morgan Kaufmann, 1990.
+(2)  More matrices and transformations: shear and pseudo-perspective.
+     Ronald Goldman. In "Graphics Gems II", pp 320-323. Morgan Kaufmann, 1991.
+(3)  Decomposing a matrix into simple transformations. Spencer Thomas.
+     In "Graphics Gems II", pp 320-323. Morgan Kaufmann, 1991.
+(4)  Recovering the data from the transformation matrix. Ronald Goldman.
+     In "Graphics Gems II", pp 324-331. Morgan Kaufmann, 1991.
+(5)  Euler angle conversion. Ken Shoemake.
+     In "Graphics Gems IV", pp 222-229. Morgan Kaufmann, 1994.
+(6)  Arcball rotation control. Ken Shoemake.
+     In "Graphics Gems IV", pp 175-192. Morgan Kaufmann, 1994.
+(7)  Representing attitude: Euler angles, unit quaternions, and rotation
+     vectors. James Diebel. 2006.
+(8)  A discussion of the solution for the best rotation to relate two sets
+     of vectors. W Kabsch. Acta Cryst. 1978. A34, 827-828.
+(9)  Closed-form solution of absolute orientation using unit quaternions.
+     BKP Horn. J Opt Soc Am A. 1987. 4(4), 629-642.
+(10) Quaternions. Ken Shoemake.
+     http://www.sfu.ca/~jwa3/cmpt461/files/quatut.pdf
+(11) From quaternion to matrix and back. JMP van Waveren. 2005.
+     http://www.intel.com/cd/ids/developer/asmo-na/eng/293748.htm
+(12) Uniform random rotations. Ken Shoemake.
+     In "Graphics Gems III", pp 124-132. Morgan Kaufmann, 1992.
+
+
+Examples
+--------
+
+>>> alpha, beta, gamma = 0.123, -1.234, 2.345
+>>> origin, xaxis, yaxis, zaxis = (0, 0, 0), (1, 0, 0), (0, 1, 0), (0, 0, 1)
+>>> I = identity_matrix()
+>>> Rx = rotation_matrix(alpha, xaxis)
+>>> Ry = rotation_matrix(beta, yaxis)
+>>> Rz = rotation_matrix(gamma, zaxis)
+>>> R = concatenate_matrices(Rx, Ry, Rz)
+>>> euler = euler_from_matrix(R, 'rxyz')
+>>> numpy.allclose([alpha, beta, gamma], euler)
+True
+>>> Re = euler_matrix(alpha, beta, gamma, 'rxyz')
+>>> is_same_transform(R, Re)
+True
+>>> al, be, ga = euler_from_matrix(Re, 'rxyz')
+>>> is_same_transform(Re, euler_matrix(al, be, ga, 'rxyz'))
+True
+>>> qx = quaternion_about_axis(alpha, xaxis)
+>>> qy = quaternion_about_axis(beta, yaxis)
+>>> qz = quaternion_about_axis(gamma, zaxis)
+>>> q = quaternion_multiply(qx, qy)
+>>> q = quaternion_multiply(q, qz)
+>>> Rq = quaternion_matrix(q)
+>>> is_same_transform(R, Rq)
+True
+>>> S = scale_matrix(1.23, origin)
+>>> T = translation_matrix((1, 2, 3))
+>>> Z = shear_matrix(beta, xaxis, origin, zaxis)
+>>> R = random_rotation_matrix(numpy.random.rand(3))
+>>> M = concatenate_matrices(T, R, Z, S)
+>>> scale, shear, angles, trans, persp = decompose_matrix(M)
+>>> numpy.allclose(scale, 1.23)
+True
+>>> numpy.allclose(trans, (1, 2, 3))
+True
+>>> numpy.allclose(shear, (0, math.tan(beta), 0))
+True
+>>> is_same_transform(R, euler_matrix(axes='sxyz', *angles))
+True
+>>> M1 = compose_matrix(scale, shear, angles, trans, persp)
+>>> is_same_transform(M, M1)
+True
+
+"""
+
+from __future__ import division
+
+import warnings
+import math
+
+import numpy
+
+# Documentation in HTML format can be generated with Epydoc
+__docformat__ = "restructuredtext en"
+
+
+def identity_matrix():
+    """Return 4x4 identity/unit matrix.
+
+    >>> I = identity_matrix()
+    >>> numpy.allclose(I, numpy.dot(I, I))
+    True
+    >>> numpy.sum(I), numpy.trace(I)
+    (4.0, 4.0)
+    >>> numpy.allclose(I, numpy.identity(4, dtype=numpy.float64))
+    True
+
+    """
+    return numpy.identity(4, dtype=numpy.float64)
+
+
+def translation_matrix(direction):
+    """Return matrix to translate by direction vector.
+
+    >>> v = numpy.random.random(3) - 0.5
+    >>> numpy.allclose(v, translation_matrix(v)[:3, 3])
+    True
+
+    """
+    M = numpy.identity(4)
+    M[:3, 3] = direction[:3]
+    return M
+
+
+def translation_from_matrix(matrix):
+    """Return translation vector from translation matrix.
+
+    >>> v0 = numpy.random.random(3) - 0.5
+    >>> v1 = translation_from_matrix(translation_matrix(v0))
+    >>> numpy.allclose(v0, v1)
+    True
+
+    """
+    return numpy.array(matrix, copy=False)[:3, 3].copy()
+
+
+def reflection_matrix(point, normal):
+    """Return matrix to mirror at plane defined by point and normal vector.
+
+    >>> v0 = numpy.random.random(4) - 0.5
+    >>> v0[3] = 1.0
+    >>> v1 = numpy.random.random(3) - 0.5
+    >>> R = reflection_matrix(v0, v1)
+    >>> numpy.allclose(2., numpy.trace(R))
+    True
+    >>> numpy.allclose(v0, numpy.dot(R, v0))
+    True
+    >>> v2 = v0.copy()
+    >>> v2[:3] += v1
+    >>> v3 = v0.copy()
+    >>> v2[:3] -= v1
+    >>> numpy.allclose(v2, numpy.dot(R, v3))
+    True
+
+    """
+    normal = unit_vector(normal[:3])
+    M = numpy.identity(4)
+    M[:3, :3] -= 2.0 * numpy.outer(normal, normal)
+    M[:3, 3] = (2.0 * numpy.dot(point[:3], normal)) * normal
+    return M
+
+
+def reflection_from_matrix(matrix):
+    """Return mirror plane point and normal vector from reflection matrix.
+
+    >>> v0 = numpy.random.random(3) - 0.5
+    >>> v1 = numpy.random.random(3) - 0.5
+    >>> M0 = reflection_matrix(v0, v1)
+    >>> point, normal = reflection_from_matrix(M0)
+    >>> M1 = reflection_matrix(point, normal)
+    >>> is_same_transform(M0, M1)
+    True
+
+    """
+    M = numpy.array(matrix, dtype=numpy.float64, copy=False)
+    # normal: unit eigenvector corresponding to eigenvalue -1
+    l, V = numpy.linalg.eig(M[:3, :3])
+    i = numpy.where(abs(numpy.real(l) + 1.0) < 1e-8)[0]
+    if not len(i):
+        raise ValueError("no unit eigenvector corresponding to eigenvalue -1")
+    normal = numpy.real(V[:, i[0]]).squeeze()
+    # point: any unit eigenvector corresponding to eigenvalue 1
+    l, V = numpy.linalg.eig(M)
+    i = numpy.where(abs(numpy.real(l) - 1.0) < 1e-8)[0]
+    if not len(i):
+        raise ValueError("no unit eigenvector corresponding to eigenvalue 1")
+    point = numpy.real(V[:, i[-1]]).squeeze()
+    point /= point[3]
+    return point, normal
+
+
+def rotation_matrix(angle, direction, point=None):
+    """Return matrix to rotate about axis defined by point and direction.
+
+    >>> angle = (random.random() - 0.5) * (2*math.pi)
+    >>> direc = numpy.random.random(3) - 0.5
+    >>> point = numpy.random.random(3) - 0.5
+    >>> R0 = rotation_matrix(angle, direc, point)
+    >>> R1 = rotation_matrix(angle-2*math.pi, direc, point)
+    >>> is_same_transform(R0, R1)
+    True
+    >>> R0 = rotation_matrix(angle, direc, point)
+    >>> R1 = rotation_matrix(-angle, -direc, point)
+    >>> is_same_transform(R0, R1)
+    True
+    >>> I = numpy.identity(4, numpy.float64)
+    >>> numpy.allclose(I, rotation_matrix(math.pi*2, direc))
+    True
+    >>> numpy.allclose(2., numpy.trace(rotation_matrix(math.pi/2,
+    ...                                                direc, point)))
+    True
+
+    """
+    sina = math.sin(angle)
+    cosa = math.cos(angle)
+    direction = unit_vector(direction[:3])
+    # rotation matrix around unit vector
+    R = numpy.array(((cosa, 0.0,  0.0),
+                     (0.0,  cosa, 0.0),
+                     (0.0,  0.0,  cosa)), dtype=numpy.float64)
+    R += numpy.outer(direction, direction) * (1.0 - cosa)
+    direction *= sina
+    R += numpy.array((( 0.0,         -direction[2],  direction[1]),
+                      ( direction[2], 0.0,          -direction[0]),
+                      (-direction[1], direction[0],  0.0)),
+                     dtype=numpy.float64)
+    M = numpy.identity(4)
+    M[:3, :3] = R
+    if point is not None:
+        # rotation not around origin
+        point = numpy.array(point[:3], dtype=numpy.float64, copy=False)
+        M[:3, 3] = point - numpy.dot(R, point)
+    return M
+
+
+def rotation_from_matrix(matrix):
+    """Return rotation angle and axis from rotation matrix.
+
+    >>> angle = (random.random() - 0.5) * (2*math.pi)
+    >>> direc = numpy.random.random(3) - 0.5
+    >>> point = numpy.random.random(3) - 0.5
+    >>> R0 = rotation_matrix(angle, direc, point)
+    >>> angle, direc, point = rotation_from_matrix(R0)
+    >>> R1 = rotation_matrix(angle, direc, point)
+    >>> is_same_transform(R0, R1)
+    True
+
+    """
+    R = numpy.array(matrix, dtype=numpy.float64, copy=False)
+    R33 = R[:3, :3]
+    # direction: unit eigenvector of R33 corresponding to eigenvalue of 1
+    l, W = numpy.linalg.eig(R33.T)
+    i = numpy.where(abs(numpy.real(l) - 1.0) < 1e-8)[0]
+    if not len(i):
+        raise ValueError("no unit eigenvector corresponding to eigenvalue 1")
+    direction = numpy.real(W[:, i[-1]]).squeeze()
+    # point: unit eigenvector of R33 corresponding to eigenvalue of 1
+    l, Q = numpy.linalg.eig(R)
+    i = numpy.where(abs(numpy.real(l) - 1.0) < 1e-8)[0]
+    if not len(i):
+        raise ValueError("no unit eigenvector corresponding to eigenvalue 1")
+    point = numpy.real(Q[:, i[-1]]).squeeze()
+    point /= point[3]
+    # rotation angle depending on direction
+    cosa = (numpy.trace(R33) - 1.0) / 2.0
+    if abs(direction[2]) > 1e-8:
+        sina = (R[1, 0] + (cosa-1.0)*direction[0]*direction[1]) / direction[2]
+    elif abs(direction[1]) > 1e-8:
+        sina = (R[0, 2] + (cosa-1.0)*direction[0]*direction[2]) / direction[1]
+    else:
+        sina = (R[2, 1] + (cosa-1.0)*direction[1]*direction[2]) / direction[0]
+    angle = math.atan2(sina, cosa)
+    return angle, direction, point
+
+
+def scale_matrix(factor, origin=None, direction=None):
+    """Return matrix to scale by factor around origin in direction.
+
+    Use factor -1 for point symmetry.
+
+    >>> v = (numpy.random.rand(4, 5) - 0.5) * 20.0
+    >>> v[3] = 1.0
+    >>> S = scale_matrix(-1.234)
+    >>> numpy.allclose(numpy.dot(S, v)[:3], -1.234*v[:3])
+    True
+    >>> factor = random.random() * 10 - 5
+    >>> origin = numpy.random.random(3) - 0.5
+    >>> direct = numpy.random.random(3) - 0.5
+    >>> S = scale_matrix(factor, origin)
+    >>> S = scale_matrix(factor, origin, direct)
+
+    """
+    if direction is None:
+        # uniform scaling
+        M = numpy.array(((factor, 0.0,    0.0,    0.0),
+                         (0.0,    factor, 0.0,    0.0),
+                         (0.0,    0.0,    factor, 0.0),
+                         (0.0,    0.0,    0.0,    1.0)), dtype=numpy.float64)
+        if origin is not None:
+            M[:3, 3] = origin[:3]
+            M[:3, 3] *= 1.0 - factor
+    else:
+        # nonuniform scaling
+        direction = unit_vector(direction[:3])
+        factor = 1.0 - factor
+        M = numpy.identity(4)
+        M[:3, :3] -= factor * numpy.outer(direction, direction)
+        if origin is not None:
+            M[:3, 3] = (factor * numpy.dot(origin[:3], direction)) * direction
+    return M
+
+
+def scale_from_matrix(matrix):
+    """Return scaling factor, origin and direction from scaling matrix.
+
+    >>> factor = random.random() * 10 - 5
+    >>> origin = numpy.random.random(3) - 0.5
+    >>> direct = numpy.random.random(3) - 0.5
+    >>> S0 = scale_matrix(factor, origin)
+    >>> factor, origin, direction = scale_from_matrix(S0)
+    >>> S1 = scale_matrix(factor, origin, direction)
+    >>> is_same_transform(S0, S1)
+    True
+    >>> S0 = scale_matrix(factor, origin, direct)
+    >>> factor, origin, direction = scale_from_matrix(S0)
+    >>> S1 = scale_matrix(factor, origin, direction)
+    >>> is_same_transform(S0, S1)
+    True
+
+    """
+    M = numpy.array(matrix, dtype=numpy.float64, copy=False)
+    M33 = M[:3, :3]
+    factor = numpy.trace(M33) - 2.0
+    try:
+        # direction: unit eigenvector corresponding to eigenvalue factor
+        l, V = numpy.linalg.eig(M33)
+        i = numpy.where(abs(numpy.real(l) - factor) < 1e-8)[0][0]
+        direction = numpy.real(V[:, i]).squeeze()
+        direction /= vector_norm(direction)
+    except IndexError:
+        # uniform scaling
+        factor = (factor + 2.0) / 3.0
+        direction = None
+    # origin: any eigenvector corresponding to eigenvalue 1
+    l, V = numpy.linalg.eig(M)
+    i = numpy.where(abs(numpy.real(l) - 1.0) < 1e-8)[0]
+    if not len(i):
+        raise ValueError("no eigenvector corresponding to eigenvalue 1")
+    origin = numpy.real(V[:, i[-1]]).squeeze()
+    origin /= origin[3]
+    return factor, origin, direction
+
+
+def projection_matrix(point, normal, direction=None,
+                      perspective=None, pseudo=False):
+    """Return matrix to project onto plane defined by point and normal.
+
+    Using either perspective point, projection direction, or none of both.
+
+    If pseudo is True, perspective projections will preserve relative depth
+    such that Perspective = dot(Orthogonal, PseudoPerspective).
+
+    >>> P = projection_matrix((0, 0, 0), (1, 0, 0))
+    >>> numpy.allclose(P[1:, 1:], numpy.identity(4)[1:, 1:])
+    True
+    >>> point = numpy.random.random(3) - 0.5
+    >>> normal = numpy.random.random(3) - 0.5
+    >>> direct = numpy.random.random(3) - 0.5
+    >>> persp = numpy.random.random(3) - 0.5
+    >>> P0 = projection_matrix(point, normal)
+    >>> P1 = projection_matrix(point, normal, direction=direct)
+    >>> P2 = projection_matrix(point, normal, perspective=persp)
+    >>> P3 = projection_matrix(point, normal, perspective=persp, pseudo=True)
+    >>> is_same_transform(P2, numpy.dot(P0, P3))
+    True
+    >>> P = projection_matrix((3, 0, 0), (1, 1, 0), (1, 0, 0))
+    >>> v0 = (numpy.random.rand(4, 5) - 0.5) * 20.0
+    >>> v0[3] = 1.0
+    >>> v1 = numpy.dot(P, v0)
+    >>> numpy.allclose(v1[1], v0[1])
+    True
+    >>> numpy.allclose(v1[0], 3.0-v1[1])
+    True
+
+    """
+    M = numpy.identity(4)
+    point = numpy.array(point[:3], dtype=numpy.float64, copy=False)
+    normal = unit_vector(normal[:3])
+    if perspective is not None:
+        # perspective projection
+        perspective = numpy.array(perspective[:3], dtype=numpy.float64,
+                                  copy=False)
+        M[0, 0] = M[1, 1] = M[2, 2] = numpy.dot(perspective-point, normal)
+        M[:3, :3] -= numpy.outer(perspective, normal)
+        if pseudo:
+            # preserve relative depth
+            M[:3, :3] -= numpy.outer(normal, normal)
+            M[:3, 3] = numpy.dot(point, normal) * (perspective+normal)
+        else:
+            M[:3, 3] = numpy.dot(point, normal) * perspective
+        M[3, :3] = -normal
+        M[3, 3] = numpy.dot(perspective, normal)
+    elif direction is not None:
+        # parallel projection
+        direction = numpy.array(direction[:3], dtype=numpy.float64, copy=False)
+        scale = numpy.dot(direction, normal)
+        M[:3, :3] -= numpy.outer(direction, normal) / scale
+        M[:3, 3] = direction * (numpy.dot(point, normal) / scale)
+    else:
+        # orthogonal projection
+        M[:3, :3] -= numpy.outer(normal, normal)
+        M[:3, 3] = numpy.dot(point, normal) * normal
+    return M
+
+
+def projection_from_matrix(matrix, pseudo=False):
+    """Return projection plane and perspective point from projection matrix.
+
+    Return values are same as arguments for projection_matrix function:
+    point, normal, direction, perspective, and pseudo.
+
+    >>> point = numpy.random.random(3) - 0.5
+    >>> normal = numpy.random.random(3) - 0.5
+    >>> direct = numpy.random.random(3) - 0.5
+    >>> persp = numpy.random.random(3) - 0.5
+    >>> P0 = projection_matrix(point, normal)
+    >>> result = projection_from_matrix(P0)
+    >>> P1 = projection_matrix(*result)
+    >>> is_same_transform(P0, P1)
+    True
+    >>> P0 = projection_matrix(point, normal, direct)
+    >>> result = projection_from_matrix(P0)
+    >>> P1 = projection_matrix(*result)
+    >>> is_same_transform(P0, P1)
+    True
+    >>> P0 = projection_matrix(point, normal, perspective=persp, pseudo=False)
+    >>> result = projection_from_matrix(P0, pseudo=False)
+    >>> P1 = projection_matrix(*result)
+    >>> is_same_transform(P0, P1)
+    True
+    >>> P0 = projection_matrix(point, normal, perspective=persp, pseudo=True)
+    >>> result = projection_from_matrix(P0, pseudo=True)
+    >>> P1 = projection_matrix(*result)
+    >>> is_same_transform(P0, P1)
+    True
+
+    """
+    M = numpy.array(matrix, dtype=numpy.float64, copy=False)
+    M33 = M[:3, :3]
+    l, V = numpy.linalg.eig(M)
+    i = numpy.where(abs(numpy.real(l) - 1.0) < 1e-8)[0]
+    if not pseudo and len(i):
+        # point: any eigenvector corresponding to eigenvalue 1
+        point = numpy.real(V[:, i[-1]]).squeeze()
+        point /= point[3]
+        # direction: unit eigenvector corresponding to eigenvalue 0
+        l, V = numpy.linalg.eig(M33)
+        i = numpy.where(abs(numpy.real(l)) < 1e-8)[0]
+        if not len(i):
+            raise ValueError("no eigenvector corresponding to eigenvalue 0")
+        direction = numpy.real(V[:, i[0]]).squeeze()
+        direction /= vector_norm(direction)
+        # normal: unit eigenvector of M33.T corresponding to eigenvalue 0
+        l, V = numpy.linalg.eig(M33.T)
+        i = numpy.where(abs(numpy.real(l)) < 1e-8)[0]
+        if len(i):
+            # parallel projection
+            normal = numpy.real(V[:, i[0]]).squeeze()
+            normal /= vector_norm(normal)
+            return point, normal, direction, None, False
+        else:
+            # orthogonal projection, where normal equals direction vector
+            return point, direction, None, None, False
+    else:
+        # perspective projection
+        i = numpy.where(abs(numpy.real(l)) > 1e-8)[0]
+        if not len(i):
+            raise ValueError(
+                "no eigenvector not corresponding to eigenvalue 0")
+        point = numpy.real(V[:, i[-1]]).squeeze()
+        point /= point[3]
+        normal = - M[3, :3]
+        perspective = M[:3, 3] / numpy.dot(point[:3], normal)
+        if pseudo:
+            perspective -= normal
+        return point, normal, None, perspective, pseudo
+
+
+def clip_matrix(left, right, bottom, top, near, far, perspective=False):
+    """Return matrix to obtain normalized device coordinates from frustrum.
+
+    The frustrum bounds are axis-aligned along x (left, right),
+    y (bottom, top) and z (near, far).
+
+    Normalized device coordinates are in range [-1, 1] if coordinates are
+    inside the frustrum.
+
+    If perspective is True the frustrum is a truncated pyramid with the
+    perspective point at origin and direction along z axis, otherwise an
+    orthographic canonical view volume (a box).
+
+    Homogeneous coordinates transformed by the perspective clip matrix
+    need to be dehomogenized (divided by w coordinate).
+
+    >>> frustrum = numpy.random.rand(6)
+    >>> frustrum[1] += frustrum[0]
+    >>> frustrum[3] += frustrum[2]
+    >>> frustrum[5] += frustrum[4]
+    >>> M = clip_matrix(*frustrum, perspective=False)
+    >>> numpy.dot(M, [frustrum[0], frustrum[2], frustrum[4], 1.0])
+    array([-1., -1., -1.,  1.])
+    >>> numpy.dot(M, [frustrum[1], frustrum[3], frustrum[5], 1.0])
+    array([ 1.,  1.,  1.,  1.])
+    >>> M = clip_matrix(*frustrum, perspective=True)
+    >>> v = numpy.dot(M, [frustrum[0], frustrum[2], frustrum[4], 1.0])
+    >>> v / v[3]
+    array([-1., -1., -1.,  1.])
+    >>> v = numpy.dot(M, [frustrum[1], frustrum[3], frustrum[4], 1.0])
+    >>> v / v[3]
+    array([ 1.,  1., -1.,  1.])
+
+    """
+    if left >= right or bottom >= top or near >= far:
+        raise ValueError("invalid frustrum")
+    if perspective:
+        if near <= _EPS:
+            raise ValueError("invalid frustrum: near <= 0")
+        t = 2.0 * near
+        M = ((-t/(right-left), 0.0, (right+left)/(right-left), 0.0),
+             (0.0, -t/(top-bottom), (top+bottom)/(top-bottom), 0.0),
+             (0.0, 0.0, -(far+near)/(far-near), t*far/(far-near)),
+             (0.0, 0.0, -1.0, 0.0))
+    else:
+        M = ((2.0/(right-left), 0.0, 0.0, (right+left)/(left-right)),
+             (0.0, 2.0/(top-bottom), 0.0, (top+bottom)/(bottom-top)),
+             (0.0, 0.0, 2.0/(far-near), (far+near)/(near-far)),
+             (0.0, 0.0, 0.0, 1.0))
+    return numpy.array(M, dtype=numpy.float64)
+
+
+def shear_matrix(angle, direction, point, normal):
+    """Return matrix to shear by angle along direction vector on shear plane.
+
+    The shear plane is defined by a point and normal vector. The direction
+    vector must be orthogonal to the plane's normal vector.
+
+    A point P is transformed by the shear matrix into P" such that
+    the vector P-P" is parallel to the direction vector and its extent is
+    given by the angle of P-P'-P", where P' is the orthogonal projection
+    of P onto the shear plane.
+
+    >>> angle = (random.random() - 0.5) * 4*math.pi
+    >>> direct = numpy.random.random(3) - 0.5
+    >>> point = numpy.random.random(3) - 0.5
+    >>> normal = numpy.cross(direct, numpy.random.random(3))
+    >>> S = shear_matrix(angle, direct, point, normal)
+    >>> numpy.allclose(1.0, numpy.linalg.det(S))
+    True
+
+    """
+    normal = unit_vector(normal[:3])
+    direction = unit_vector(direction[:3])
+    if abs(numpy.dot(normal, direction)) > 1e-6:
+        raise ValueError("direction and normal vectors are not orthogonal")
+    angle = math.tan(angle)
+    M = numpy.identity(4)
+    M[:3, :3] += angle * numpy.outer(direction, normal)
+    M[:3, 3] = -angle * numpy.dot(point[:3], normal) * direction
+    return M
+
+
+def shear_from_matrix(matrix):
+    """Return shear angle, direction and plane from shear matrix.
+
+    >>> angle = (random.random() - 0.5) * 4*math.pi
+    >>> direct = numpy.random.random(3) - 0.5
+    >>> point = numpy.random.random(3) - 0.5
+    >>> normal = numpy.cross(direct, numpy.random.random(3))
+    >>> S0 = shear_matrix(angle, direct, point, normal)
+    >>> angle, direct, point, normal = shear_from_matrix(S0)
+    >>> S1 = shear_matrix(angle, direct, point, normal)
+    >>> is_same_transform(S0, S1)
+    True
+
+    """
+    M = numpy.array(matrix, dtype=numpy.float64, copy=False)
+    M33 = M[:3, :3]
+    # normal: cross independent eigenvectors corresponding to the eigenvalue 1
+    l, V = numpy.linalg.eig(M33)
+    i = numpy.where(abs(numpy.real(l) - 1.0) < 1e-4)[0]
+    if len(i) < 2:
+        raise ValueError("No two linear independent eigenvectors found %s" % l)
+    V = numpy.real(V[:, i]).squeeze().T
+    lenorm = -1.0
+    for i0, i1 in ((0, 1), (0, 2), (1, 2)):
+        n = numpy.cross(V[i0], V[i1])
+        l = vector_norm(n)
+        if l > lenorm:
+            lenorm = l
+            normal = n
+    normal /= lenorm
+    # direction and angle
+    direction = numpy.dot(M33 - numpy.identity(3), normal)
+    angle = vector_norm(direction)
+    direction /= angle
+    angle = math.atan(angle)
+    # point: eigenvector corresponding to eigenvalue 1
+    l, V = numpy.linalg.eig(M)
+    i = numpy.where(abs(numpy.real(l) - 1.0) < 1e-8)[0]
+    if not len(i):
+        raise ValueError("no eigenvector corresponding to eigenvalue 1")
+    point = numpy.real(V[:, i[-1]]).squeeze()
+    point /= point[3]
+    return angle, direction, point, normal
+
+
+def decompose_matrix(matrix):
+    """Return sequence of transformations from transformation matrix.
+
+    matrix : array_like
+        Non-degenerative homogeneous transformation matrix
+
+    Return tuple of:
+        scale : vector of 3 scaling factors
+        shear : list of shear factors for x-y, x-z, y-z axes
+        angles : list of Euler angles about static x, y, z axes
+        translate : translation vector along x, y, z axes
+        perspective : perspective partition of matrix
+
+    Raise ValueError if matrix is of wrong type or degenerative.
+
+    >>> T0 = translation_matrix((1, 2, 3))
+    >>> scale, shear, angles, trans, persp = decompose_matrix(T0)
+    >>> T1 = translation_matrix(trans)
+    >>> numpy.allclose(T0, T1)
+    True
+    >>> S = scale_matrix(0.123)
+    >>> scale, shear, angles, trans, persp = decompose_matrix(S)
+    >>> scale[0]
+    0.123
+    >>> R0 = euler_matrix(1, 2, 3)
+    >>> scale, shear, angles, trans, persp = decompose_matrix(R0)
+    >>> R1 = euler_matrix(*angles)
+    >>> numpy.allclose(R0, R1)
+    True
+
+    """
+    M = numpy.array(matrix, dtype=numpy.float64, copy=True).T
+    if abs(M[3, 3]) < _EPS:
+        raise ValueError("M[3, 3] is zero")
+    M /= M[3, 3]
+    P = M.copy()
+    P[:, 3] = 0, 0, 0, 1
+    if not numpy.linalg.det(P):
+        raise ValueError("Matrix is singular")
+
+    scale = numpy.zeros((3, ), dtype=numpy.float64)
+    shear = [0, 0, 0]
+    angles = [0, 0, 0]
+
+    if any(abs(M[:3, 3]) > _EPS):
+        perspective = numpy.dot(M[:, 3], numpy.linalg.inv(P.T))
+        M[:, 3] = 0, 0, 0, 1
+    else:
+        perspective = numpy.array((0, 0, 0, 1), dtype=numpy.float64)
+
+    translate = M[3, :3].copy()
+    M[3, :3] = 0
+
+    row = M[:3, :3].copy()
+    scale[0] = vector_norm(row[0])
+    row[0] /= scale[0]
+    shear[0] = numpy.dot(row[0], row[1])
+    row[1] -= row[0] * shear[0]
+    scale[1] = vector_norm(row[1])
+    row[1] /= scale[1]
+    shear[0] /= scale[1]
+    shear[1] = numpy.dot(row[0], row[2])
+    row[2] -= row[0] * shear[1]
+    shear[2] = numpy.dot(row[1], row[2])
+    row[2] -= row[1] * shear[2]
+    scale[2] = vector_norm(row[2])
+    row[2] /= scale[2]
+    shear[1:] /= scale[2]
+
+    if numpy.dot(row[0], numpy.cross(row[1], row[2])) < 0:
+        scale *= -1
+        row *= -1
+
+    angles[1] = math.asin(-row[0, 2])
+    if math.cos(angles[1]):
+        angles[0] = math.atan2(row[1, 2], row[2, 2])
+        angles[2] = math.atan2(row[0, 1], row[0, 0])
+    else:
+        #angles[0] = math.atan2(row[1, 0], row[1, 1])
+        angles[0] = math.atan2(-row[2, 1], row[1, 1])
+        angles[2] = 0.0
+
+    return scale, shear, angles, translate, perspective
+
+
+def compose_matrix(scale=None, shear=None, angles=None, translate=None,
+                   perspective=None):
+    """Return transformation matrix from sequence of transformations.
+
+    This is the inverse of the decompose_matrix function.
+
+    Sequence of transformations:
+        scale : vector of 3 scaling factors
+        shear : list of shear factors for x-y, x-z, y-z axes
+        angles : list of Euler angles about static x, y, z axes
+        translate : translation vector along x, y, z axes
+        perspective : perspective partition of matrix
+
+    >>> scale = numpy.random.random(3) - 0.5
+    >>> shear = numpy.random.random(3) - 0.5
+    >>> angles = (numpy.random.random(3) - 0.5) * (2*math.pi)
+    >>> trans = numpy.random.random(3) - 0.5
+    >>> persp = numpy.random.random(4) - 0.5
+    >>> M0 = compose_matrix(scale, shear, angles, trans, persp)
+    >>> result = decompose_matrix(M0)
+    >>> M1 = compose_matrix(*result)
+    >>> is_same_transform(M0, M1)
+    True
+
+    """
+    M = numpy.identity(4)
+    if perspective is not None:
+        P = numpy.identity(4)
+        P[3, :] = perspective[:4]
+        M = numpy.dot(M, P)
+    if translate is not None:
+        T = numpy.identity(4)
+        T[:3, 3] = translate[:3]
+        M = numpy.dot(M, T)
+    if angles is not None:
+        R = euler_matrix(angles[0], angles[1], angles[2], 'sxyz')
+        M = numpy.dot(M, R)
+    if shear is not None:
+        Z = numpy.identity(4)
+        Z[1, 2] = shear[2]
+        Z[0, 2] = shear[1]
+        Z[0, 1] = shear[0]
+        M = numpy.dot(M, Z)
+    if scale is not None:
+        S = numpy.identity(4)
+        S[0, 0] = scale[0]
+        S[1, 1] = scale[1]
+        S[2, 2] = scale[2]
+        M = numpy.dot(M, S)
+    M /= M[3, 3]
+    return M
+
+
+def orthogonalization_matrix(lengths, angles):
+    """Return orthogonalization matrix for crystallographic cell coordinates.
+
+    Angles are expected in degrees.
+
+    The de-orthogonalization matrix is the inverse.
+
+    >>> O = orthogonalization_matrix((10., 10., 10.), (90., 90., 90.))
+    >>> numpy.allclose(O[:3, :3], numpy.identity(3, float) * 10)
+    True
+    >>> O = orthogonalization_matrix([9.8, 12.0, 15.5], [87.2, 80.7, 69.7])
+    >>> numpy.allclose(numpy.sum(O), 43.063229)
+    True
+
+    """
+    a, b, c = lengths
+    angles = numpy.radians(angles)
+    sina, sinb, _ = numpy.sin(angles)
+    cosa, cosb, cosg = numpy.cos(angles)
+    co = (cosa * cosb - cosg) / (sina * sinb)
+    return numpy.array((
+        ( a*sinb*math.sqrt(1.0-co*co),  0.0,    0.0, 0.0),
+        (-a*sinb*co,                    b*sina, 0.0, 0.0),
+        ( a*cosb,                       b*cosa, c,   0.0),
+        ( 0.0,                          0.0,    0.0, 1.0)),
+        dtype=numpy.float64)
+
+
+def superimposition_matrix(v0, v1, scaling=False, usesvd=True):
+    """Return matrix to transform given vector set into second vector set.
+
+    v0 and v1 are shape (3, \*) or (4, \*) arrays of at least 3 vectors.
+
+    If usesvd is True, the weighted sum of squared deviations (RMSD) is
+    minimized according to the algorithm by W. Kabsch [8]. Otherwise the
+    quaternion based algorithm by B. Horn [9] is used (slower when using
+    this Python implementation).
+
+    The returned matrix performs rotation, translation and uniform scaling
+    (if specified).
+
+    >>> v0 = numpy.random.rand(3, 10)
+    >>> M = superimposition_matrix(v0, v0)
+    >>> numpy.allclose(M, numpy.identity(4))
+    True
+    >>> R = random_rotation_matrix(numpy.random.random(3))
+    >>> v0 = ((1,0,0), (0,1,0), (0,0,1), (1,1,1))
+    >>> v1 = numpy.dot(R, v0)
+    >>> M = superimposition_matrix(v0, v1)
+    >>> numpy.allclose(v1, numpy.dot(M, v0))
+    True
+    >>> v0 = (numpy.random.rand(4, 100) - 0.5) * 20.0
+    >>> v0[3] = 1.0
+    >>> v1 = numpy.dot(R, v0)
+    >>> M = superimposition_matrix(v0, v1)
+    >>> numpy.allclose(v1, numpy.dot(M, v0))
+    True
+    >>> S = scale_matrix(random.random())
+    >>> T = translation_matrix(numpy.random.random(3)-0.5)
+    >>> M = concatenate_matrices(T, R, S)
+    >>> v1 = numpy.dot(M, v0)
+    >>> v0[:3] += numpy.random.normal(0.0, 1e-9, 300).reshape(3, -1)
+    >>> M = superimposition_matrix(v0, v1, scaling=True)
+    >>> numpy.allclose(v1, numpy.dot(M, v0))
+    True
+    >>> M = superimposition_matrix(v0, v1, scaling=True, usesvd=False)
+    >>> numpy.allclose(v1, numpy.dot(M, v0))
+    True
+    >>> v = numpy.empty((4, 100, 3), dtype=numpy.float64)
+    >>> v[:, :, 0] = v0
+    >>> M = superimposition_matrix(v0, v1, scaling=True, usesvd=False)
+    >>> numpy.allclose(v1, numpy.dot(M, v[:, :, 0]))
+    True
+
+    """
+    v0 = numpy.array(v0, dtype=numpy.float64, copy=False)[:3]
+    v1 = numpy.array(v1, dtype=numpy.float64, copy=False)[:3]
+
+    if v0.shape != v1.shape or v0.shape[1] < 3:
+        raise ValueError("Vector sets are of wrong shape or type.")
+
+    # move centroids to origin
+    t0 = numpy.mean(v0, axis=1)
+    t1 = numpy.mean(v1, axis=1)
+    v0 = v0 - t0.reshape(3, 1)
+    v1 = v1 - t1.reshape(3, 1)
+
+    if usesvd:
+        # Singular Value Decomposition of covariance matrix
+        u, s, vh = numpy.linalg.svd(numpy.dot(v1, v0.T))
+        # rotation matrix from SVD orthonormal bases
+        R = numpy.dot(u, vh)
+        if numpy.linalg.det(R) < 0.0:
+            # R does not constitute right handed system
+            R -= numpy.outer(u[:, 2], vh[2, :]*2.0)
+            s[-1] *= -1.0
+        # homogeneous transformation matrix
+        M = numpy.identity(4)
+        M[:3, :3] = R
+    else:
+        # compute symmetric matrix N
+        xx, yy, zz = numpy.sum(v0 * v1, axis=1)
+        xy, yz, zx = numpy.sum(v0 * numpy.roll(v1, -1, axis=0), axis=1)
+        xz, yx, zy = numpy.sum(v0 * numpy.roll(v1, -2, axis=0), axis=1)
+        N = ((xx+yy+zz, yz-zy,    zx-xz,    xy-yx),
+             (yz-zy,    xx-yy-zz, xy+yx,    zx+xz),
+             (zx-xz,    xy+yx,   -xx+yy-zz, yz+zy),
+             (xy-yx,    zx+xz,    yz+zy,   -xx-yy+zz))
+        # quaternion: eigenvector corresponding to most positive eigenvalue
+        l, V = numpy.linalg.eig(N)
+        q = V[:, numpy.argmax(l)]
+        q /= vector_norm(q) # unit quaternion
+        q = numpy.roll(q, -1) # move w component to end
+        # homogeneous transformation matrix
+        M = quaternion_matrix(q)
+
+    # scale: ratio of rms deviations from centroid
+    if scaling:
+        v0 *= v0
+        v1 *= v1
+        M[:3, :3] *= math.sqrt(numpy.sum(v1) / numpy.sum(v0))
+
+    # translation
+    M[:3, 3] = t1
+    T = numpy.identity(4)
+    T[:3, 3] = -t0
+    M = numpy.dot(M, T)
+    return M
+
+
+def euler_matrix(ai, aj, ak, axes='sxyz'):
+    """Return homogeneous rotation matrix from Euler angles and axis sequence.
+
+    ai, aj, ak : Euler's roll, pitch and yaw angles
+    axes : One of 24 axis sequences as string or encoded tuple
+
+    >>> R = euler_matrix(1, 2, 3, 'syxz')
+    >>> numpy.allclose(numpy.sum(R[0]), -1.34786452)
+    True
+    >>> R = euler_matrix(1, 2, 3, (0, 1, 0, 1))
+    >>> numpy.allclose(numpy.sum(R[0]), -0.383436184)
+    True
+    >>> ai, aj, ak = (4.0*math.pi) * (numpy.random.random(3) - 0.5)
+    >>> for axes in _AXES2TUPLE.keys():
+    ...    R = euler_matrix(ai, aj, ak, axes)
+    >>> for axes in _TUPLE2AXES.keys():
+    ...    R = euler_matrix(ai, aj, ak, axes)
+
+    """
+    try:
+        firstaxis, parity, repetition, frame = _AXES2TUPLE[axes]
+    except (AttributeError, KeyError):
+        _ = _TUPLE2AXES[axes]
+        firstaxis, parity, repetition, frame = axes
+
+    i = firstaxis
+    j = _NEXT_AXIS[i+parity]
+    k = _NEXT_AXIS[i-parity+1]
+
+    if frame:
+        ai, ak = ak, ai
+    if parity:
+        ai, aj, ak = -ai, -aj, -ak
+
+    si, sj, sk = math.sin(ai), math.sin(aj), math.sin(ak)
+    ci, cj, ck = math.cos(ai), math.cos(aj), math.cos(ak)
+    cc, cs = ci*ck, ci*sk
+    sc, ss = si*ck, si*sk
+
+    M = numpy.identity(4)
+    if repetition:
+        M[i, i] = cj
+        M[i, j] = sj*si
+        M[i, k] = sj*ci
+        M[j, i] = sj*sk
+        M[j, j] = -cj*ss+cc
+        M[j, k] = -cj*cs-sc
+        M[k, i] = -sj*ck
+        M[k, j] = cj*sc+cs
+        M[k, k] = cj*cc-ss
+    else:
+        M[i, i] = cj*ck
+        M[i, j] = sj*sc-cs
+        M[i, k] = sj*cc+ss
+        M[j, i] = cj*sk
+        M[j, j] = sj*ss+cc
+        M[j, k] = sj*cs-sc
+        M[k, i] = -sj
+        M[k, j] = cj*si
+        M[k, k] = cj*ci
+    return M
+
+
+def euler_from_matrix(matrix, axes='sxyz'):
+    """Return Euler angles from rotation matrix for specified axis sequence.
+
+    axes : One of 24 axis sequences as string or encoded tuple
+
+    Note that many Euler angle triplets can describe one matrix.
+
+    >>> R0 = euler_matrix(1, 2, 3, 'syxz')
+    >>> al, be, ga = euler_from_matrix(R0, 'syxz')
+    >>> R1 = euler_matrix(al, be, ga, 'syxz')
+    >>> numpy.allclose(R0, R1)
+    True
+    >>> angles = (4.0*math.pi) * (numpy.random.random(3) - 0.5)
+    >>> for axes in _AXES2TUPLE.keys():
+    ...    R0 = euler_matrix(axes=axes, *angles)
+    ...    R1 = euler_matrix(axes=axes, *euler_from_matrix(R0, axes))
+    ...    if not numpy.allclose(R0, R1): print axes, "failed"
+
+    """
+    try:
+        firstaxis, parity, repetition, frame = _AXES2TUPLE[axes.lower()]
+    except (AttributeError, KeyError):
+        _ = _TUPLE2AXES[axes]
+        firstaxis, parity, repetition, frame = axes
+
+    i = firstaxis
+    j = _NEXT_AXIS[i+parity]
+    k = _NEXT_AXIS[i-parity+1]
+
+    M = numpy.array(matrix, dtype=numpy.float64, copy=False)[:3, :3]
+    if repetition:
+        sy = math.sqrt(M[i, j]*M[i, j] + M[i, k]*M[i, k])
+        if sy > _EPS:
+            ax = math.atan2( M[i, j],  M[i, k])
+            ay = math.atan2( sy,       M[i, i])
+            az = math.atan2( M[j, i], -M[k, i])
+        else:
+            ax = math.atan2(-M[j, k],  M[j, j])
+            ay = math.atan2( sy,       M[i, i])
+            az = 0.0
+    else:
+        cy = math.sqrt(M[i, i]*M[i, i] + M[j, i]*M[j, i])
+        if cy > _EPS:
+            ax = math.atan2( M[k, j],  M[k, k])
+            ay = math.atan2(-M[k, i],  cy)
+            az = math.atan2( M[j, i],  M[i, i])
+        else:
+            ax = math.atan2(-M[j, k],  M[j, j])
+            ay = math.atan2(-M[k, i],  cy)
+            az = 0.0
+
+    if parity:
+        ax, ay, az = -ax, -ay, -az
+    if frame:
+        ax, az = az, ax
+    return ax, ay, az
+
+
+def euler_from_quaternion(quaternion, axes='sxyz'):
+    """Return Euler angles from quaternion for specified axis sequence.
+
+    >>> angles = euler_from_quaternion([0.06146124, 0, 0, 0.99810947])
+    >>> numpy.allclose(angles, [0.123, 0, 0])
+    True
+
+    """
+    return euler_from_matrix(quaternion_matrix(quaternion), axes)
+
+
+def quaternion_from_euler(ai, aj, ak, axes='sxyz'):
+    """Return quaternion from Euler angles and axis sequence.
+
+    ai, aj, ak : Euler's roll, pitch and yaw angles
+    axes : One of 24 axis sequences as string or encoded tuple
+
+    >>> q = quaternion_from_euler(1, 2, 3, 'ryxz')
+    >>> numpy.allclose(q, [0.310622, -0.718287, 0.444435, 0.435953])
+    True
+
+    """
+    try:
+        firstaxis, parity, repetition, frame = _AXES2TUPLE[axes.lower()]
+    except (AttributeError, KeyError):
+        _ = _TUPLE2AXES[axes]
+        firstaxis, parity, repetition, frame = axes
+
+    i = firstaxis
+    j = _NEXT_AXIS[i+parity]
+    k = _NEXT_AXIS[i-parity+1]
+
+    if frame:
+        ai, ak = ak, ai
+    if parity:
+        aj = -aj
+
+    ai /= 2.0
+    aj /= 2.0
+    ak /= 2.0
+    ci = math.cos(ai)
+    si = math.sin(ai)
+    cj = math.cos(aj)
+    sj = math.sin(aj)
+    ck = math.cos(ak)
+    sk = math.sin(ak)
+    cc = ci*ck
+    cs = ci*sk
+    sc = si*ck
+    ss = si*sk
+
+    quaternion = numpy.empty((4, ), dtype=numpy.float64)
+    if repetition:
+        quaternion[i] = cj*(cs + sc)
+        quaternion[j] = sj*(cc + ss)
+        quaternion[k] = sj*(cs - sc)
+        quaternion[3] = cj*(cc - ss)
+    else:
+        quaternion[i] = cj*sc - sj*cs
+        quaternion[j] = cj*ss + sj*cc
+        quaternion[k] = cj*cs - sj*sc
+        quaternion[3] = cj*cc + sj*ss
+    if parity:
+        quaternion[j] *= -1
+
+    return quaternion
+
+
+def quaternion_about_axis(angle, axis):
+    """Return quaternion for rotation about axis.
+
+    >>> q = quaternion_about_axis(0.123, (1, 0, 0))
+    >>> numpy.allclose(q, [0.06146124, 0, 0, 0.99810947])
+    True
+
+    """
+    quaternion = numpy.zeros((4, ), dtype=numpy.float64)
+    quaternion[:3] = axis[:3]
+    qlen = vector_norm(quaternion)
+    if qlen > _EPS:
+        quaternion *= math.sin(angle/2.0) / qlen
+    quaternion[3] = math.cos(angle/2.0)
+    return quaternion
+
+
+def quaternion_matrix(quaternion):
+    """Return homogeneous rotation matrix from quaternion.
+
+    >>> R = quaternion_matrix([0.06146124, 0, 0, 0.99810947])
+    >>> numpy.allclose(R, rotation_matrix(0.123, (1, 0, 0)))
+    True
+
+    """
+    q = numpy.array(quaternion[:4], dtype=numpy.float64, copy=True)
+    nq = numpy.dot(q, q)
+    if nq < _EPS:
+        return numpy.identity(4)
+    q *= math.sqrt(2.0 / nq)
+    q = numpy.outer(q, q)
+    return numpy.array((
+        (1.0-q[1, 1]-q[2, 2],     q[0, 1]-q[2, 3],     q[0, 2]+q[1, 3], 0.0),
+        (    q[0, 1]+q[2, 3], 1.0-q[0, 0]-q[2, 2],     q[1, 2]-q[0, 3], 0.0),
+        (    q[0, 2]-q[1, 3],     q[1, 2]+q[0, 3], 1.0-q[0, 0]-q[1, 1], 0.0),
+        (                0.0,                 0.0,                 0.0, 1.0)
+        ), dtype=numpy.float64)
+
+
+def quaternion_from_matrix(matrix):
+    """Return quaternion from rotation matrix.
+
+    >>> R = rotation_matrix(0.123, (1, 2, 3))
+    >>> q = quaternion_from_matrix(R)
+    >>> numpy.allclose(q, [0.0164262, 0.0328524, 0.0492786, 0.9981095])
+    True
+
+    """
+    q = numpy.empty((4, ), dtype=numpy.float64)
+    M = numpy.array(matrix, dtype=numpy.float64, copy=False)[:4, :4]
+    t = numpy.trace(M)
+    if t > M[3, 3]:
+        q[3] = t
+        q[2] = M[1, 0] - M[0, 1]
+        q[1] = M[0, 2] - M[2, 0]
+        q[0] = M[2, 1] - M[1, 2]
+    else:
+        i, j, k = 0, 1, 2
+        if M[1, 1] > M[0, 0]:
+            i, j, k = 1, 2, 0
+        if M[2, 2] > M[i, i]:
+            i, j, k = 2, 0, 1
+        t = M[i, i] - (M[j, j] + M[k, k]) + M[3, 3]
+        q[i] = t
+        q[j] = M[i, j] + M[j, i]
+        q[k] = M[k, i] + M[i, k]
+        q[3] = M[k, j] - M[j, k]
+    q *= 0.5 / math.sqrt(t * M[3, 3])
+    return q
+
+
+def quaternion_multiply(quaternion1, quaternion0):
+    """Return multiplication of two quaternions.
+
+    >>> q = quaternion_multiply([1, -2, 3, 4], [-5, 6, 7, 8])
+    >>> numpy.allclose(q, [-44, -14, 48, 28])
+    True
+
+    """
+    x0, y0, z0, w0 = quaternion0
+    x1, y1, z1, w1 = quaternion1
+    return numpy.array((
+         x1*w0 + y1*z0 - z1*y0 + w1*x0,
+        -x1*z0 + y1*w0 + z1*x0 + w1*y0,
+         x1*y0 - y1*x0 + z1*w0 + w1*z0,
+        -x1*x0 - y1*y0 - z1*z0 + w1*w0), dtype=numpy.float64)
+
+
+def quaternion_conjugate(quaternion):
+    """Return conjugate of quaternion.
+
+    >>> q0 = random_quaternion()
+    >>> q1 = quaternion_conjugate(q0)
+    >>> q1[3] == q0[3] and all(q1[:3] == -q0[:3])
+    True
+
+    """
+    return numpy.array((-quaternion[0], -quaternion[1],
+                        -quaternion[2], quaternion[3]), dtype=numpy.float64)
+
+
+def quaternion_inverse(quaternion):
+    """Return inverse of quaternion.
+
+    >>> q0 = random_quaternion()
+    >>> q1 = quaternion_inverse(q0)
+    >>> numpy.allclose(quaternion_multiply(q0, q1), [0, 0, 0, 1])
+    True
+
+    """
+    return quaternion_conjugate(quaternion) / numpy.dot(quaternion, quaternion)
+
+
+def quaternion_slerp(quat0, quat1, fraction, spin=0, shortestpath=True):
+    """Return spherical linear interpolation between two quaternions.
+
+    >>> q0 = random_quaternion()
+    >>> q1 = random_quaternion()
+    >>> q = quaternion_slerp(q0, q1, 0.0)
+    >>> numpy.allclose(q, q0)
+    True
+    >>> q = quaternion_slerp(q0, q1, 1.0, 1)
+    >>> numpy.allclose(q, q1)
+    True
+    >>> q = quaternion_slerp(q0, q1, 0.5)
+    >>> angle = math.acos(numpy.dot(q0, q))
+    >>> numpy.allclose(2.0, math.acos(numpy.dot(q0, q1)) / angle) or \
+        numpy.allclose(2.0, math.acos(-numpy.dot(q0, q1)) / angle)
+    True
+
+    """
+    q0 = unit_vector(quat0[:4])
+    q1 = unit_vector(quat1[:4])
+    if fraction == 0.0:
+        return q0
+    elif fraction == 1.0:
+        return q1
+    d = numpy.dot(q0, q1)
+    if abs(abs(d) - 1.0) < _EPS:
+        return q0
+    if shortestpath and d < 0.0:
+        # invert rotation
+        d = -d
+        q1 *= -1.0
+    angle = math.acos(d) + spin * math.pi
+    if abs(angle) < _EPS:
+        return q0
+    isin = 1.0 / math.sin(angle)
+    q0 *= math.sin((1.0 - fraction) * angle) * isin
+    q1 *= math.sin(fraction * angle) * isin
+    q0 += q1
+    return q0
+
+
+def random_quaternion(rand=None):
+    """Return uniform random unit quaternion.
+
+    rand: array like or None
+        Three independent random variables that are uniformly distributed
+        between 0 and 1.
+
+    >>> q = random_quaternion()
+    >>> numpy.allclose(1.0, vector_norm(q))
+    True
+    >>> q = random_quaternion(numpy.random.random(3))
+    >>> q.shape
+    (4,)
+
+    """
+    if rand is None:
+        rand = numpy.random.rand(3)
+    else:
+        assert len(rand) == 3
+    r1 = numpy.sqrt(1.0 - rand[0])
+    r2 = numpy.sqrt(rand[0])
+    pi2 = math.pi * 2.0
+    t1 = pi2 * rand[1]
+    t2 = pi2 * rand[2]
+    return numpy.array((numpy.sin(t1)*r1,
+                        numpy.cos(t1)*r1,
+                        numpy.sin(t2)*r2,
+                        numpy.cos(t2)*r2), dtype=numpy.float64)
+
+
+def random_rotation_matrix(rand=None):
+    """Return uniform random rotation matrix.
+
+    rnd: array like
+        Three independent random variables that are uniformly distributed
+        between 0 and 1 for each returned quaternion.
+
+    >>> R = random_rotation_matrix()
+    >>> numpy.allclose(numpy.dot(R.T, R), numpy.identity(4))
+    True
+
+    """
+    return quaternion_matrix(random_quaternion(rand))
+
+
+class Arcball(object):
+    """Virtual Trackball Control.
+
+    >>> ball = Arcball()
+    >>> ball = Arcball(initial=numpy.identity(4))
+    >>> ball.place([320, 320], 320)
+    >>> ball.down([500, 250])
+    >>> ball.drag([475, 275])
+    >>> R = ball.matrix()
+    >>> numpy.allclose(numpy.sum(R), 3.90583455)
+    True
+    >>> ball = Arcball(initial=[0, 0, 0, 1])
+    >>> ball.place([320, 320], 320)
+    >>> ball.setaxes([1,1,0], [-1, 1, 0])
+    >>> ball.setconstrain(True)
+    >>> ball.down([400, 200])
+    >>> ball.drag([200, 400])
+    >>> R = ball.matrix()
+    >>> numpy.allclose(numpy.sum(R), 0.2055924)
+    True
+    >>> ball.next()
+
+    """
+
+    def __init__(self, initial=None):
+        """Initialize virtual trackball control.
+
+        initial : quaternion or rotation matrix
+
+        """
+        self._axis = None
+        self._axes = None
+        self._radius = 1.0
+        self._center = [0.0, 0.0]
+        self._vdown = numpy.array([0, 0, 1], dtype=numpy.float64)
+        self._constrain = False
+
+        if initial is None:
+            self._qdown = numpy.array([0, 0, 0, 1], dtype=numpy.float64)
+        else:
+            initial = numpy.array(initial, dtype=numpy.float64)
+            if initial.shape == (4, 4):
+                self._qdown = quaternion_from_matrix(initial)
+            elif initial.shape == (4, ):
+                initial /= vector_norm(initial)
+                self._qdown = initial
+            else:
+                raise ValueError("initial not a quaternion or matrix.")
+
+        self._qnow = self._qpre = self._qdown
+
+    def place(self, center, radius):
+        """Place Arcball, e.g. when window size changes.
+
+        center : sequence[2]
+            Window coordinates of trackball center.
+        radius : float
+            Radius of trackball in window coordinates.
+
+        """
+        self._radius = float(radius)
+        self._center[0] = center[0]
+        self._center[1] = center[1]
+
+    def setaxes(self, *axes):
+        """Set axes to constrain rotations."""
+        if axes is None:
+            self._axes = None
+        else:
+            self._axes = [unit_vector(axis) for axis in axes]
+
+    def setconstrain(self, constrain):
+        """Set state of constrain to axis mode."""
+        self._constrain = constrain == True
+
+    def getconstrain(self):
+        """Return state of constrain to axis mode."""
+        return self._constrain
+
+    def down(self, point):
+        """Set initial cursor window coordinates and pick constrain-axis."""
+        self._vdown = arcball_map_to_sphere(point, self._center, self._radius)
+        self._qdown = self._qpre = self._qnow
+
+        if self._constrain and self._axes is not None:
+            self._axis = arcball_nearest_axis(self._vdown, self._axes)
+            self._vdown = arcball_constrain_to_axis(self._vdown, self._axis)
+        else:
+            self._axis = None
+
+    def drag(self, point):
+        """Update current cursor window coordinates."""
+        vnow = arcball_map_to_sphere(point, self._center, self._radius)
+
+        if self._axis is not None:
+            vnow = arcball_constrain_to_axis(vnow, self._axis)
+
+        self._qpre = self._qnow
+
+        t = numpy.cross(self._vdown, vnow)
+        if numpy.dot(t, t) < _EPS:
+            self._qnow = self._qdown
+        else:
+            q = [t[0], t[1], t[2], numpy.dot(self._vdown, vnow)]
+            self._qnow = quaternion_multiply(q, self._qdown)
+
+    def next(self, acceleration=0.0):
+        """Continue rotation in direction of last drag."""
+        q = quaternion_slerp(self._qpre, self._qnow, 2.0+acceleration, False)
+        self._qpre, self._qnow = self._qnow, q
+
+    def matrix(self):
+        """Return homogeneous rotation matrix."""
+        return quaternion_matrix(self._qnow)
+
+
+def arcball_map_to_sphere(point, center, radius):
+    """Return unit sphere coordinates from window coordinates."""
+    v = numpy.array(((point[0] - center[0]) / radius,
+                     (center[1] - point[1]) / radius,
+                     0.0), dtype=numpy.float64)
+    n = v[0]*v[0] + v[1]*v[1]
+    if n > 1.0:
+        v /= math.sqrt(n) # position outside of sphere
+    else:
+        v[2] = math.sqrt(1.0 - n)
+    return v
+
+
+def arcball_constrain_to_axis(point, axis):
+    """Return sphere point perpendicular to axis."""
+    v = numpy.array(point, dtype=numpy.float64, copy=True)
+    a = numpy.array(axis, dtype=numpy.float64, copy=True)
+    v -= a * numpy.dot(a, v) # on plane
+    n = vector_norm(v)
+    if n > _EPS:
+        if v[2] < 0.0:
+            v *= -1.0
+        v /= n
+        return v
+    if a[2] == 1.0:
+        return numpy.array([1, 0, 0], dtype=numpy.float64)
+    return unit_vector([-a[1], a[0], 0])
+
+
+def arcball_nearest_axis(point, axes):
+    """Return axis, which arc is nearest to point."""
+    point = numpy.array(point, dtype=numpy.float64, copy=False)
+    nearest = None
+    mx = -1.0
+    for axis in axes:
+        t = numpy.dot(arcball_constrain_to_axis(point, axis), point)
+        if t > mx:
+            nearest = axis
+            mx = t
+    return nearest
+
+
+# epsilon for testing whether a number is close to zero
+_EPS = numpy.finfo(float).eps * 4.0
+
+# axis sequences for Euler angles
+_NEXT_AXIS = [1, 2, 0, 1]
+
+# map axes strings to/from tuples of inner axis, parity, repetition, frame
+_AXES2TUPLE = {
+    'sxyz': (0, 0, 0, 0), 'sxyx': (0, 0, 1, 0), 'sxzy': (0, 1, 0, 0),
+    'sxzx': (0, 1, 1, 0), 'syzx': (1, 0, 0, 0), 'syzy': (1, 0, 1, 0),
+    'syxz': (1, 1, 0, 0), 'syxy': (1, 1, 1, 0), 'szxy': (2, 0, 0, 0),
+    'szxz': (2, 0, 1, 0), 'szyx': (2, 1, 0, 0), 'szyz': (2, 1, 1, 0),
+    'rzyx': (0, 0, 0, 1), 'rxyx': (0, 0, 1, 1), 'ryzx': (0, 1, 0, 1),
+    'rxzx': (0, 1, 1, 1), 'rxzy': (1, 0, 0, 1), 'ryzy': (1, 0, 1, 1),
+    'rzxy': (1, 1, 0, 1), 'ryxy': (1, 1, 1, 1), 'ryxz': (2, 0, 0, 1),
+    'rzxz': (2, 0, 1, 1), 'rxyz': (2, 1, 0, 1), 'rzyz': (2, 1, 1, 1)}
+
+_TUPLE2AXES = dict((v, k) for k, v in _AXES2TUPLE.items())
+
+# helper functions
+
+def vector_norm(data, axis=None, out=None):
+    """Return length, i.e. eucledian norm, of ndarray along axis.
+
+    >>> v = numpy.random.random(3)
+    >>> n = vector_norm(v)
+    >>> numpy.allclose(n, numpy.linalg.norm(v))
+    True
+    >>> v = numpy.random.rand(6, 5, 3)
+    >>> n = vector_norm(v, axis=-1)
+    >>> numpy.allclose(n, numpy.sqrt(numpy.sum(v*v, axis=2)))
+    True
+    >>> n = vector_norm(v, axis=1)
+    >>> numpy.allclose(n, numpy.sqrt(numpy.sum(v*v, axis=1)))
+    True
+    >>> v = numpy.random.rand(5, 4, 3)
+    >>> n = numpy.empty((5, 3), dtype=numpy.float64)
+    >>> vector_norm(v, axis=1, out=n)
+    >>> numpy.allclose(n, numpy.sqrt(numpy.sum(v*v, axis=1)))
+    True
+    >>> vector_norm([])
+    0.0
+    >>> vector_norm([1.0])
+    1.0
+
+    """
+    data = numpy.array(data, dtype=numpy.float64, copy=True)
+    if out is None:
+        if data.ndim == 1:
+            return math.sqrt(numpy.dot(data, data))
+        data *= data
+        out = numpy.atleast_1d(numpy.sum(data, axis=axis))
+        numpy.sqrt(out, out)
+        return out
+    else:
+        data *= data
+        numpy.sum(data, axis=axis, out=out)
+        numpy.sqrt(out, out)
+
+
+def unit_vector(data, axis=None, out=None):
+    """Return ndarray normalized by length, i.e. eucledian norm, along axis.
+
+    >>> v0 = numpy.random.random(3)
+    >>> v1 = unit_vector(v0)
+    >>> numpy.allclose(v1, v0 / numpy.linalg.norm(v0))
+    True
+    >>> v0 = numpy.random.rand(5, 4, 3)
+    >>> v1 = unit_vector(v0, axis=-1)
+    >>> v2 = v0 / numpy.expand_dims(numpy.sqrt(numpy.sum(v0*v0, axis=2)), 2)
+    >>> numpy.allclose(v1, v2)
+    True
+    >>> v1 = unit_vector(v0, axis=1)
+    >>> v2 = v0 / numpy.expand_dims(numpy.sqrt(numpy.sum(v0*v0, axis=1)), 1)
+    >>> numpy.allclose(v1, v2)
+    True
+    >>> v1 = numpy.empty((5, 4, 3), dtype=numpy.float64)
+    >>> unit_vector(v0, axis=1, out=v1)
+    >>> numpy.allclose(v1, v2)
+    True
+    >>> list(unit_vector([]))
+    []
+    >>> list(unit_vector([1.0]))
+    [1.0]
+
+    """
+    if out is None:
+        data = numpy.array(data, dtype=numpy.float64, copy=True)
+        if data.ndim == 1:
+            data /= math.sqrt(numpy.dot(data, data))
+            return data
+    else:
+        if out is not data:
+            out[:] = numpy.array(data, copy=False)
+        data = out
+    length = numpy.atleast_1d(numpy.sum(data*data, axis))
+    numpy.sqrt(length, length)
+    if axis is not None:
+        length = numpy.expand_dims(length, axis)
+    data /= length
+    if out is None:
+        return data
+
+
+def random_vector(size):
+    """Return array of random doubles in the half-open interval [0.0, 1.0).
+
+    >>> v = random_vector(10000)
+    >>> numpy.all(v >= 0.0) and numpy.all(v < 1.0)
+    True
+    >>> v0 = random_vector(10)
+    >>> v1 = random_vector(10)
+    >>> numpy.any(v0 == v1)
+    False
+
+    """
+    return numpy.random.random(size)
+
+
+def inverse_matrix(matrix):
+    """Return inverse of square transformation matrix.
+
+    >>> M0 = random_rotation_matrix()
+    >>> M1 = inverse_matrix(M0.T)
+    >>> numpy.allclose(M1, numpy.linalg.inv(M0.T))
+    True
+    >>> for size in range(1, 7):
+    ...     M0 = numpy.random.rand(size, size)
+    ...     M1 = inverse_matrix(M0)
+    ...     if not numpy.allclose(M1, numpy.linalg.inv(M0)): print size
+
+    """
+    return numpy.linalg.inv(matrix)
+
+
+def concatenate_matrices(*matrices):
+    """Return concatenation of series of transformation matrices.
+
+    >>> M = numpy.random.rand(16).reshape((4, 4)) - 0.5
+    >>> numpy.allclose(M, concatenate_matrices(M))
+    True
+    >>> numpy.allclose(numpy.dot(M, M.T), concatenate_matrices(M, M.T))
+    True
+
+    """
+    M = numpy.identity(4)
+    for i in matrices:
+        M = numpy.dot(M, i)
+    return M
+
+
+def is_same_transform(matrix0, matrix1):
+    """Return True if two matrices perform same transformation.
+
+    >>> is_same_transform(numpy.identity(4), numpy.identity(4))
+    True
+    >>> is_same_transform(numpy.identity(4), random_rotation_matrix())
+    False
+
+    """
+    matrix0 = numpy.array(matrix0, dtype=numpy.float64, copy=True)
+    matrix0 /= matrix0[3, 3]
+    matrix1 = numpy.array(matrix1, dtype=numpy.float64, copy=True)
+    matrix1 /= matrix1[3, 3]
+    return numpy.allclose(matrix0, matrix1)
+
+
+def _import_module(module_name, warn=True, prefix='_py_', ignore='_'):
+    """Try import all public attributes from module into global namespace.
+
+    Existing attributes with name clashes are renamed with prefix.
+    Attributes starting with underscore are ignored by default.
+
+    Return True on successful import.
+
+    """
+    try:
+        module = __import__(module_name)
+    except ImportError:
+        if warn:
+            warnings.warn("Failed to import module " + module_name)
+    else:
+        for attr in dir(module):
+            if ignore and attr.startswith(ignore):
+                continue
+            if prefix:
+                if attr in globals():
+                    globals()[prefix + attr] = globals()[attr]
+                elif warn:
+                    warnings.warn("No Python implementation of " + attr)
+            globals()[attr] = getattr(module, attr)
+        return True
diff --git a/libs/assimp/port/PyAssimp/setup.py b/libs/assimp/port/PyAssimp/setup.py
new file mode 100644
index 0000000..a3497d6
--- /dev/null
+++ b/libs/assimp/port/PyAssimp/setup.py
@@ -0,0 +1,26 @@
+ #!/usr/bin/env python
+ # -*- coding: utf-8 -*-
+import os
+from distutils.core import setup
+
+def readme():
+    with open('README.rst') as f:
+        return f.read()
+
+setup(name='pyassimp',
+      version='4.1.4',
+      license='ISC',
+      description='Python bindings for the Open Asset Import Library (ASSIMP)',
+      long_description=readme(),
+      url='https://github.com/assimp/assimp',
+      author='ASSIMP developers',
+      author_email='assimp-discussions@lists.sourceforge.net',
+      maintainer='Séverin Lemaignan',
+      maintainer_email='severin@guakamole.org',
+      packages=['pyassimp'],
+      data_files=[
+                  ('share/pyassimp', ['README.rst']),
+                  ('share/examples/pyassimp', ['scripts/' + f for f in os.listdir('scripts/')])
+                 ],
+      requires=['numpy']
+      )