add assimp submodule

1 files changed, 1828 insertions, 0 deletions

diff --git a/src/mesh/assimp-master/code/AssetLib/Collada/ColladaLoader.cpp b/src/mesh/assimp-master/code/AssetLib/Collada/ColladaLoader.cpp
new file mode 100644
index 0000000..775ba44
--- /dev/null
+++ b/src/mesh/assimp-master/code/AssetLib/Collada/ColladaLoader.cpp
@@ -0,0 +1,1828 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp 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 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.
+---------------------------------------------------------------------------
+*/
+
+/** @file Implementation of the Collada loader */
+
+#ifndef ASSIMP_BUILD_NO_COLLADA_IMPORTER
+
+#include "ColladaLoader.h"
+#include "ColladaParser.h"
+#include <assimp/ColladaMetaData.h>
+#include <assimp/CreateAnimMesh.h>
+#include <assimp/ParsingUtils.h>
+#include <assimp/SkeletonMeshBuilder.h>
+#include <assimp/ZipArchiveIOSystem.h>
+#include <assimp/anim.h>
+#include <assimp/fast_atof.h>
+#include <assimp/importerdesc.h>
+#include <assimp/scene.h>
+#include <assimp/DefaultLogger.hpp>
+#include <assimp/Importer.hpp>
+
+#include <numeric>
+
+namespace Assimp {
+
+using namespace Assimp::Formatter;
+using namespace Assimp::Collada;
+
+static const aiImporterDesc desc = {
+    "Collada Importer",
+    "",
+    "",
+    "http://collada.org",
+    aiImporterFlags_SupportTextFlavour | aiImporterFlags_SupportCompressedFlavour,
+    1,
+    3,
+    1,
+    5,
+    "dae xml zae"
+};
+
+static const float kMillisecondsFromSeconds = 1000.f;
+
+// Add an item of metadata to a node
+// Assumes the key is not already in the list
+template <typename T>
+inline void AddNodeMetaData(aiNode *node, const std::string &key, const T &value) {
+    if (nullptr == node->mMetaData) {
+        node->mMetaData = new aiMetadata();
+    }
+    node->mMetaData->Add(key, value);
+}
+
+// ------------------------------------------------------------------------------------------------
+// Constructor to be privately used by Importer
+ColladaLoader::ColladaLoader() :
+        mFileName(),
+        mMeshIndexByID(),
+        mMaterialIndexByName(),
+        mMeshes(),
+        newMats(),
+        mCameras(),
+        mLights(),
+        mTextures(),
+        mAnims(),
+        noSkeletonMesh(false),
+        ignoreUpDirection(false),
+        useColladaName(false),
+        mNodeNameCounter(0) {
+    // empty
+}
+
+// ------------------------------------------------------------------------------------------------
+// Destructor, private as well
+ColladaLoader::~ColladaLoader() {
+    // empty
+}
+
+// ------------------------------------------------------------------------------------------------
+// Returns whether the class can handle the format of the given file.
+bool ColladaLoader::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /*checkSig*/) const {
+    // Look for a DAE file inside, but don't extract it
+    ZipArchiveIOSystem zip_archive(pIOHandler, pFile);
+    if (zip_archive.isOpen()) {
+        return !ColladaParser::ReadZaeManifest(zip_archive).empty();
+    }
+
+    static const char *tokens[] = { "<collada" };
+    return SearchFileHeaderForToken(pIOHandler, pFile, tokens, AI_COUNT_OF(tokens));
+}
+
+// ------------------------------------------------------------------------------------------------
+void ColladaLoader::SetupProperties(const Importer *pImp) {
+    noSkeletonMesh = pImp->GetPropertyInteger(AI_CONFIG_IMPORT_NO_SKELETON_MESHES, 0) != 0;
+    ignoreUpDirection = pImp->GetPropertyInteger(AI_CONFIG_IMPORT_COLLADA_IGNORE_UP_DIRECTION, 0) != 0;
+    useColladaName = pImp->GetPropertyInteger(AI_CONFIG_IMPORT_COLLADA_USE_COLLADA_NAMES, 0) != 0;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Get file extension list
+const aiImporterDesc *ColladaLoader::GetInfo() const {
+    return &desc;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Imports the given file into the given scene structure.
+void ColladaLoader::InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) {
+    mFileName = pFile;
+
+    // clean all member arrays - just for safety, it should work even if we did not
+    mMeshIndexByID.clear();
+    mMaterialIndexByName.clear();
+    mMeshes.clear();
+    mTargetMeshes.clear();
+    newMats.clear();
+    mLights.clear();
+    mCameras.clear();
+    mTextures.clear();
+    mAnims.clear();
+
+    // parse the input file
+    ColladaParser parser(pIOHandler, pFile);
+
+    if (!parser.mRootNode) {
+        throw DeadlyImportError("Collada: File came out empty. Something is wrong here.");
+    }
+
+    // reserve some storage to avoid unnecessary reallocs
+    newMats.reserve(parser.mMaterialLibrary.size() * 2u);
+    mMeshes.reserve(parser.mMeshLibrary.size() * 2u);
+
+    mCameras.reserve(parser.mCameraLibrary.size());
+    mLights.reserve(parser.mLightLibrary.size());
+
+    // create the materials first, for the meshes to find
+    BuildMaterials(parser, pScene);
+
+    // build the node hierarchy from it
+    pScene->mRootNode = BuildHierarchy(parser, parser.mRootNode);
+
+    // ... then fill the materials with the now adjusted settings
+    FillMaterials(parser, pScene);
+
+    // Apply unit-size scale calculation
+
+    pScene->mRootNode->mTransformation *= aiMatrix4x4(parser.mUnitSize, 0, 0, 0,
+            0, parser.mUnitSize, 0, 0,
+            0, 0, parser.mUnitSize, 0,
+            0, 0, 0, 1);
+    if (!ignoreUpDirection) {
+        // Convert to Y_UP, if different orientation
+        if (parser.mUpDirection == ColladaParser::UP_X) {
+            pScene->mRootNode->mTransformation *= aiMatrix4x4(
+                    0, -1, 0, 0,
+                    1, 0, 0, 0,
+                    0, 0, 1, 0,
+                    0, 0, 0, 1);
+        } else if (parser.mUpDirection == ColladaParser::UP_Z) {
+            pScene->mRootNode->mTransformation *= aiMatrix4x4(
+                    1, 0, 0, 0,
+                    0, 0, 1, 0,
+                    0, -1, 0, 0,
+                    0, 0, 0, 1);
+        }
+    }
+
+    // Store scene metadata
+    if (!parser.mAssetMetaData.empty()) {
+        const size_t numMeta(parser.mAssetMetaData.size());
+        pScene->mMetaData = aiMetadata::Alloc(static_cast<unsigned int>(numMeta));
+        size_t i = 0;
+        for (auto it = parser.mAssetMetaData.cbegin(); it != parser.mAssetMetaData.cend(); ++it, ++i) {
+            pScene->mMetaData->Set(static_cast<unsigned int>(i), (*it).first, (*it).second);
+        }
+    }
+
+    StoreSceneMeshes(pScene);
+    StoreSceneMaterials(pScene);
+    StoreSceneTextures(pScene);
+    StoreSceneLights(pScene);
+    StoreSceneCameras(pScene);
+    StoreAnimations(pScene, parser);
+
+    // If no meshes have been loaded, it's probably just an animated skeleton.
+    if (0u == pScene->mNumMeshes) {
+        if (!noSkeletonMesh) {
+            SkeletonMeshBuilder hero(pScene);
+        }
+        pScene->mFlags |= AI_SCENE_FLAGS_INCOMPLETE;
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Recursively constructs a scene node for the given parser node and returns it.
+aiNode *ColladaLoader::BuildHierarchy(const ColladaParser &pParser, const Collada::Node *pNode) {
+    // create a node for it
+    aiNode *node = new aiNode();
+
+    // find a name for the new node. It's more complicated than you might think
+    node->mName.Set(FindNameForNode(pNode));
+    // if we're not using the unique IDs, hold onto them for reference and export
+    if (useColladaName) {
+        if (!pNode->mID.empty()) {
+            AddNodeMetaData(node, AI_METADATA_COLLADA_ID, aiString(pNode->mID));
+        }
+        if (!pNode->mSID.empty()) {
+            AddNodeMetaData(node, AI_METADATA_COLLADA_SID, aiString(pNode->mSID));
+        }
+    }
+
+    // calculate the transformation matrix for it
+    node->mTransformation = pParser.CalculateResultTransform(pNode->mTransforms);
+
+    // now resolve node instances
+    std::vector<const Node*> instances;
+    ResolveNodeInstances(pParser, pNode, instances);
+
+    // add children. first the *real* ones
+    node->mNumChildren = static_cast<unsigned int>(pNode->mChildren.size() + instances.size());
+    node->mChildren = new aiNode *[node->mNumChildren];
+
+    for (size_t a = 0; a < pNode->mChildren.size(); ++a) {
+        node->mChildren[a] = BuildHierarchy(pParser, pNode->mChildren[a]);
+        node->mChildren[a]->mParent = node;
+    }
+
+    // ... and finally the resolved node instances
+    for (size_t a = 0; a < instances.size(); ++a) {
+        node->mChildren[pNode->mChildren.size() + a] = BuildHierarchy(pParser, instances[a]);
+        node->mChildren[pNode->mChildren.size() + a]->mParent = node;
+    }
+
+    BuildMeshesForNode(pParser, pNode, node);
+    BuildCamerasForNode(pParser, pNode, node);
+    BuildLightsForNode(pParser, pNode, node);
+
+    return node;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Resolve node instances
+void ColladaLoader::ResolveNodeInstances(const ColladaParser &pParser, const Node *pNode,
+        std::vector<const Node*> &resolved) {
+    // reserve enough storage
+    resolved.reserve(pNode->mNodeInstances.size());
+
+    // ... and iterate through all nodes to be instanced as children of pNode
+    for (const auto &nodeInst : pNode->mNodeInstances) {
+        // find the corresponding node in the library
+        const ColladaParser::NodeLibrary::const_iterator itt = pParser.mNodeLibrary.find(nodeInst.mNode);
+        const Node *nd = itt == pParser.mNodeLibrary.end() ? nullptr : (*itt).second;
+
+        // FIX for http://sourceforge.net/tracker/?func=detail&aid=3054873&group_id=226462&atid=1067632
+        // need to check for both name and ID to catch all. To avoid breaking valid files,
+        // the workaround is only enabled when the first attempt to resolve the node has failed.
+        if (nullptr == nd) {
+            nd = FindNode(pParser.mRootNode, nodeInst.mNode);
+        }
+        if (nullptr == nd) {
+            ASSIMP_LOG_ERROR("Collada: Unable to resolve reference to instanced node ", nodeInst.mNode);
+        } else {
+            //  attach this node to the list of children
+            resolved.push_back(nd);
+        }
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Resolve UV channels
+void ColladaLoader::ApplyVertexToEffectSemanticMapping(Sampler &sampler, const SemanticMappingTable &table) {
+    SemanticMappingTable::InputSemanticMap::const_iterator it = table.mMap.find(sampler.mUVChannel);
+    if (it == table.mMap.end()) {
+        return;
+    }
+
+    if (it->second.mType != IT_Texcoord) {
+        ASSIMP_LOG_ERROR("Collada: Unexpected effect input mapping");
+    }
+
+    sampler.mUVId = it->second.mSet;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Builds lights for the given node and references them
+void ColladaLoader::BuildLightsForNode(const ColladaParser &pParser, const Node *pNode, aiNode *pTarget) {
+    for (const LightInstance &lid : pNode->mLights) {
+        // find the referred light
+        ColladaParser::LightLibrary::const_iterator srcLightIt = pParser.mLightLibrary.find(lid.mLight);
+        if (srcLightIt == pParser.mLightLibrary.end()) {
+            ASSIMP_LOG_WARN("Collada: Unable to find light for ID \"", lid.mLight, "\". Skipping.");
+            continue;
+        }
+        const Collada::Light *srcLight = &srcLightIt->second;
+
+        // now fill our ai data structure
+        aiLight *out = new aiLight();
+        out->mName = pTarget->mName;
+        out->mType = (aiLightSourceType)srcLight->mType;
+
+        // collada lights point in -Z by default, rest is specified in node transform
+        out->mDirection = aiVector3D(0.f, 0.f, -1.f);
+
+        out->mAttenuationConstant = srcLight->mAttConstant;
+        out->mAttenuationLinear = srcLight->mAttLinear;
+        out->mAttenuationQuadratic = srcLight->mAttQuadratic;
+
+        out->mColorDiffuse = out->mColorSpecular = out->mColorAmbient = srcLight->mColor * srcLight->mIntensity;
+        if (out->mType == aiLightSource_AMBIENT) {
+            out->mColorDiffuse = out->mColorSpecular = aiColor3D(0, 0, 0);
+            out->mColorAmbient = srcLight->mColor * srcLight->mIntensity;
+        } else {
+            // collada doesn't differentiate between these color types
+            out->mColorDiffuse = out->mColorSpecular = srcLight->mColor * srcLight->mIntensity;
+            out->mColorAmbient = aiColor3D(0, 0, 0);
+        }
+
+        // convert falloff angle and falloff exponent in our representation, if given
+        if (out->mType == aiLightSource_SPOT) {
+            out->mAngleInnerCone = AI_DEG_TO_RAD(srcLight->mFalloffAngle);
+
+            // ... some extension magic.
+            if (srcLight->mOuterAngle >= ASSIMP_COLLADA_LIGHT_ANGLE_NOT_SET * (1 - ai_epsilon)) {
+                // ... some deprecation magic.
+                if (srcLight->mPenumbraAngle >= ASSIMP_COLLADA_LIGHT_ANGLE_NOT_SET * (1 - ai_epsilon)) {
+                    // Need to rely on falloff_exponent. I don't know how to interpret it, so I need to guess ....
+                    // epsilon chosen to be 0.1
+                    float f = 1.0f;
+                    if ( 0.0f != srcLight->mFalloffExponent ) {
+                        f = 1.f / srcLight->mFalloffExponent;
+                    }
+                    out->mAngleOuterCone = std::acos(std::pow(0.1f, f)) +
+                                           out->mAngleInnerCone;
+                } else {
+                    out->mAngleOuterCone = out->mAngleInnerCone + AI_DEG_TO_RAD(srcLight->mPenumbraAngle);
+                    if (out->mAngleOuterCone < out->mAngleInnerCone)
+                        std::swap(out->mAngleInnerCone, out->mAngleOuterCone);
+                }
+            } else {
+                out->mAngleOuterCone = AI_DEG_TO_RAD(srcLight->mOuterAngle);
+            }
+        }
+
+        // add to light list
+        mLights.push_back(out);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Builds cameras for the given node and references them
+void ColladaLoader::BuildCamerasForNode(const ColladaParser &pParser, const Node *pNode, aiNode *pTarget) {
+    for (const CameraInstance &cid : pNode->mCameras) {
+        // find the referred light
+        ColladaParser::CameraLibrary::const_iterator srcCameraIt = pParser.mCameraLibrary.find(cid.mCamera);
+        if (srcCameraIt == pParser.mCameraLibrary.end()) {
+            ASSIMP_LOG_WARN("Collada: Unable to find camera for ID \"", cid.mCamera, "\". Skipping.");
+            continue;
+        }
+        const Collada::Camera *srcCamera = &srcCameraIt->second;
+
+        // orthographic cameras not yet supported in Assimp
+        if (srcCamera->mOrtho) {
+            ASSIMP_LOG_WARN("Collada: Orthographic cameras are not supported.");
+        }
+
+        // now fill our ai data structure
+        aiCamera *out = new aiCamera();
+        out->mName = pTarget->mName;
+
+        // collada cameras point in -Z by default, rest is specified in node transform
+        out->mLookAt = aiVector3D(0.f, 0.f, -1.f);
+
+        // near/far z is already ok
+        out->mClipPlaneFar = srcCamera->mZFar;
+        out->mClipPlaneNear = srcCamera->mZNear;
+
+        // ... but for the rest some values are optional
+        // and we need to compute the others in any combination.
+        if (srcCamera->mAspect != 10e10f) {
+            out->mAspect = srcCamera->mAspect;
+        }
+
+        if (srcCamera->mHorFov != 10e10f) {
+            out->mHorizontalFOV = srcCamera->mHorFov;
+
+            if (srcCamera->mVerFov != 10e10f && srcCamera->mAspect == 10e10f) {
+                out->mAspect = std::tan(AI_DEG_TO_RAD(srcCamera->mHorFov)) /
+                               std::tan(AI_DEG_TO_RAD(srcCamera->mVerFov));
+            }
+
+        } else if (srcCamera->mAspect != 10e10f && srcCamera->mVerFov != 10e10f) {
+            out->mHorizontalFOV = 2.0f * AI_RAD_TO_DEG(std::atan(srcCamera->mAspect *
+                                                                 std::tan(AI_DEG_TO_RAD(srcCamera->mVerFov) * 0.5f)));
+        }
+
+        // Collada uses degrees, we use radians
+        out->mHorizontalFOV = AI_DEG_TO_RAD(out->mHorizontalFOV);
+
+        // add to camera list
+        mCameras.push_back(out);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Builds meshes for the given node and references them
+void ColladaLoader::BuildMeshesForNode(const ColladaParser &pParser, const Node *pNode, aiNode *pTarget) {
+    // accumulated mesh references by this node
+    std::vector<size_t> newMeshRefs;
+    newMeshRefs.reserve(pNode->mMeshes.size());
+
+    // add a mesh for each subgroup in each collada mesh
+    for (const MeshInstance &mid : pNode->mMeshes) {
+        const Mesh *srcMesh = nullptr;
+        const Controller *srcController = nullptr;
+
+        // find the referred mesh
+        ColladaParser::MeshLibrary::const_iterator srcMeshIt = pParser.mMeshLibrary.find(mid.mMeshOrController);
+        if (srcMeshIt == pParser.mMeshLibrary.end()) {
+            // if not found in the mesh-library, it might also be a controller referring to a mesh
+            ColladaParser::ControllerLibrary::const_iterator srcContrIt = pParser.mControllerLibrary.find(mid.mMeshOrController);
+            if (srcContrIt != pParser.mControllerLibrary.end()) {
+                srcController = &srcContrIt->second;
+                srcMeshIt = pParser.mMeshLibrary.find(srcController->mMeshId);
+                if (srcMeshIt != pParser.mMeshLibrary.end()) {
+                    srcMesh = srcMeshIt->second;
+                }
+            }
+
+            if (nullptr == srcMesh) {
+                ASSIMP_LOG_WARN("Collada: Unable to find geometry for ID \"", mid.mMeshOrController, "\". Skipping.");
+                continue;
+            }
+        } else {
+            // ID found in the mesh library -> direct reference to an unskinned mesh
+            srcMesh = srcMeshIt->second;
+        }
+
+        // build a mesh for each of its subgroups
+        size_t vertexStart = 0, faceStart = 0;
+        for (size_t sm = 0; sm < srcMesh->mSubMeshes.size(); ++sm) {
+            const Collada::SubMesh &submesh = srcMesh->mSubMeshes[sm];
+            if (submesh.mNumFaces == 0) {
+                continue;
+            }
+
+            // find material assigned to this submesh
+            std::string meshMaterial;
+            std::map<std::string, SemanticMappingTable>::const_iterator meshMatIt = mid.mMaterials.find(submesh.mMaterial);
+
+            const Collada::SemanticMappingTable *table = nullptr;
+            if (meshMatIt != mid.mMaterials.end()) {
+                table = &meshMatIt->second;
+                meshMaterial = table->mMatName;
+            } else {
+                ASSIMP_LOG_WARN("Collada: No material specified for subgroup <", submesh.mMaterial, "> in geometry <",
+                        mid.mMeshOrController, ">.");
+                if (!mid.mMaterials.empty()) {
+                    meshMaterial = mid.mMaterials.begin()->second.mMatName;
+                }
+            }
+
+            // OK ... here the *real* fun starts ... we have the vertex-input-to-effect-semantic-table
+            // given. The only mapping stuff which we do actually support is the UV channel.
+            std::map<std::string, size_t>::const_iterator matIt = mMaterialIndexByName.find(meshMaterial);
+            unsigned int matIdx = 0;
+            if (matIt != mMaterialIndexByName.end()) {
+                matIdx = static_cast<unsigned int>(matIt->second);
+            }
+
+            if (table && !table->mMap.empty()) {
+                std::pair<Collada::Effect *, aiMaterial *> &mat = newMats[matIdx];
+
+                // Iterate through all texture channels assigned to the effect and
+                // check whether we have mapping information for it.
+                ApplyVertexToEffectSemanticMapping(mat.first->mTexDiffuse, *table);
+                ApplyVertexToEffectSemanticMapping(mat.first->mTexAmbient, *table);
+                ApplyVertexToEffectSemanticMapping(mat.first->mTexSpecular, *table);
+                ApplyVertexToEffectSemanticMapping(mat.first->mTexEmissive, *table);
+                ApplyVertexToEffectSemanticMapping(mat.first->mTexTransparent, *table);
+                ApplyVertexToEffectSemanticMapping(mat.first->mTexBump, *table);
+            }
+
+            // built lookup index of the Mesh-Submesh-Material combination
+            ColladaMeshIndex index(mid.mMeshOrController, sm, meshMaterial);
+
+            // if we already have the mesh at the library, just add its index to the node's array
+            std::map<ColladaMeshIndex, size_t>::const_iterator dstMeshIt = mMeshIndexByID.find(index);
+            if (dstMeshIt != mMeshIndexByID.end()) {
+                newMeshRefs.push_back(dstMeshIt->second);
+            } else {
+                // else we have to add the mesh to the collection and store its newly assigned index at the node
+                aiMesh *dstMesh = CreateMesh(pParser, srcMesh, submesh, srcController, vertexStart, faceStart);
+
+                // store the mesh, and store its new index in the node
+                newMeshRefs.push_back(mMeshes.size());
+                mMeshIndexByID[index] = mMeshes.size();
+                mMeshes.push_back(dstMesh);
+                vertexStart += dstMesh->mNumVertices;
+                faceStart += submesh.mNumFaces;
+
+                // assign the material index
+                std::map<std::string, size_t>::const_iterator subMatIt = mMaterialIndexByName.find(submesh.mMaterial);
+                if (subMatIt != mMaterialIndexByName.end()) {
+                    dstMesh->mMaterialIndex = static_cast<unsigned int>(subMatIt->second);
+                } else {
+                    dstMesh->mMaterialIndex = matIdx;
+                }
+                if (dstMesh->mName.length == 0) {
+                    dstMesh->mName = mid.mMeshOrController;
+                }
+            }
+        }
+    }
+
+    // now place all mesh references we gathered in the target node
+    pTarget->mNumMeshes = static_cast<unsigned int>(newMeshRefs.size());
+    if (!newMeshRefs.empty()) {
+        struct UIntTypeConverter {
+            unsigned int operator()(const size_t &v) const {
+                return static_cast<unsigned int>(v);
+            }
+        };
+
+        pTarget->mMeshes = new unsigned int[pTarget->mNumMeshes];
+        std::transform(newMeshRefs.begin(), newMeshRefs.end(), pTarget->mMeshes, UIntTypeConverter());
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Find mesh from either meshes or morph target meshes
+aiMesh *ColladaLoader::findMesh(const std::string &meshid) {
+    if (meshid.empty()) {
+        return nullptr;
+    }
+
+    for (auto & mMeshe : mMeshes) {
+        if (std::string(mMeshe->mName.data) == meshid) {
+            return mMeshe;
+        }
+    }
+
+    for (auto & mTargetMeshe : mTargetMeshes) {
+        if (std::string(mTargetMeshe->mName.data) == meshid) {
+            return mTargetMeshe;
+        }
+    }
+
+    return nullptr;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Creates a mesh for the given ColladaMesh face subset and returns the newly created mesh
+aiMesh *ColladaLoader::CreateMesh(const ColladaParser &pParser, const Mesh *pSrcMesh, const SubMesh &pSubMesh,
+        const Controller *pSrcController, size_t pStartVertex, size_t pStartFace) {
+    std::unique_ptr<aiMesh> dstMesh(new aiMesh);
+
+    if (useColladaName) {
+        dstMesh->mName = pSrcMesh->mName;
+    } else {
+        dstMesh->mName = pSrcMesh->mId;
+    }
+
+    if (pSrcMesh->mPositions.empty()) {
+        return dstMesh.release();
+    }
+
+    // count the vertices addressed by its faces
+    const size_t numVertices = std::accumulate(pSrcMesh->mFaceSize.begin() + pStartFace,
+            pSrcMesh->mFaceSize.begin() + pStartFace + pSubMesh.mNumFaces, size_t(0));
+
+    // copy positions
+    dstMesh->mNumVertices = static_cast<unsigned int>(numVertices);
+    dstMesh->mVertices = new aiVector3D[numVertices];
+    std::copy(pSrcMesh->mPositions.begin() + pStartVertex, pSrcMesh->mPositions.begin() + pStartVertex + numVertices, dstMesh->mVertices);
+
+    // normals, if given. HACK: (thom) Due to the glorious Collada spec we never
+    // know if we have the same number of normals as there are positions. So we
+    // also ignore any vertex attribute if it has a different count
+    if (pSrcMesh->mNormals.size() >= pStartVertex + numVertices) {
+        dstMesh->mNormals = new aiVector3D[numVertices];
+        std::copy(pSrcMesh->mNormals.begin() + pStartVertex, pSrcMesh->mNormals.begin() + pStartVertex + numVertices, dstMesh->mNormals);
+    }
+
+    // tangents, if given.
+    if (pSrcMesh->mTangents.size() >= pStartVertex + numVertices) {
+        dstMesh->mTangents = new aiVector3D[numVertices];
+        std::copy(pSrcMesh->mTangents.begin() + pStartVertex, pSrcMesh->mTangents.begin() + pStartVertex + numVertices, dstMesh->mTangents);
+    }
+
+    // bitangents, if given.
+    if (pSrcMesh->mBitangents.size() >= pStartVertex + numVertices) {
+        dstMesh->mBitangents = new aiVector3D[numVertices];
+        std::copy(pSrcMesh->mBitangents.begin() + pStartVertex, pSrcMesh->mBitangents.begin() + pStartVertex + numVertices, dstMesh->mBitangents);
+    }
+
+    // same for texture coords, as many as we have
+    // empty slots are not allowed, need to pack and adjust UV indexes accordingly
+    for (size_t a = 0, real = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++a) {
+        if (pSrcMesh->mTexCoords[a].size() >= pStartVertex + numVertices) {
+            dstMesh->mTextureCoords[real] = new aiVector3D[numVertices];
+            for (size_t b = 0; b < numVertices; ++b) {
+                dstMesh->mTextureCoords[real][b] = pSrcMesh->mTexCoords[a][pStartVertex + b];
+            }
+
+            dstMesh->mNumUVComponents[real] = pSrcMesh->mNumUVComponents[a];
+            ++real;
+        }
+    }
+
+    // same for vertex colors, as many as we have. again the same packing to avoid empty slots
+    for (size_t a = 0, real = 0; a < AI_MAX_NUMBER_OF_COLOR_SETS; ++a) {
+        if (pSrcMesh->mColors[a].size() >= pStartVertex + numVertices) {
+            dstMesh->mColors[real] = new aiColor4D[numVertices];
+            std::copy(pSrcMesh->mColors[a].begin() + pStartVertex, pSrcMesh->mColors[a].begin() + pStartVertex + numVertices, dstMesh->mColors[real]);
+            ++real;
+        }
+    }
+
+    // create faces. Due to the fact that each face uses unique vertices, we can simply count up on each vertex
+    size_t vertex = 0;
+    dstMesh->mNumFaces = static_cast<unsigned int>(pSubMesh.mNumFaces);
+    dstMesh->mFaces = new aiFace[dstMesh->mNumFaces];
+    for (size_t a = 0; a < dstMesh->mNumFaces; ++a) {
+        size_t s = pSrcMesh->mFaceSize[pStartFace + a];
+        aiFace &face = dstMesh->mFaces[a];
+        face.mNumIndices = static_cast<unsigned int>(s);
+        face.mIndices = new unsigned int[s];
+        for (size_t b = 0; b < s; ++b) {
+            face.mIndices[b] = static_cast<unsigned int>(vertex++);
+        }
+    }
+
+    // create morph target meshes if any
+    std::vector<aiMesh *> targetMeshes;
+    std::vector<float> targetWeights;
+    Collada::MorphMethod method = Normalized;
+
+    for (std::map<std::string, Controller>::const_iterator it = pParser.mControllerLibrary.begin();
+            it != pParser.mControllerLibrary.end(); ++it) {
+        const Controller &c = it->second;
+        const Collada::Mesh *baseMesh = pParser.ResolveLibraryReference(pParser.mMeshLibrary, c.mMeshId);
+
+        if (c.mType == Collada::Morph && baseMesh->mName == pSrcMesh->mName) {
+            const Collada::Accessor &targetAccessor = pParser.ResolveLibraryReference(pParser.mAccessorLibrary, c.mMorphTarget);
+            const Collada::Accessor &weightAccessor = pParser.ResolveLibraryReference(pParser.mAccessorLibrary, c.mMorphWeight);
+            const Collada::Data &targetData = pParser.ResolveLibraryReference(pParser.mDataLibrary, targetAccessor.mSource);
+            const Collada::Data &weightData = pParser.ResolveLibraryReference(pParser.mDataLibrary, weightAccessor.mSource);
+
+            // take method
+            method = c.mMethod;
+
+            if (!targetData.mIsStringArray) {
+                throw DeadlyImportError("target data must contain id. ");
+            }
+            if (weightData.mIsStringArray) {
+                throw DeadlyImportError("target weight data must not be textual ");
+            }
+
+            for (const auto & mString : targetData.mStrings) {
+                const Mesh *targetMesh = pParser.ResolveLibraryReference(pParser.mMeshLibrary, mString);
+
+                aiMesh *aimesh = findMesh(useColladaName ? targetMesh->mName : targetMesh->mId);
+                if (!aimesh) {
+                    if (targetMesh->mSubMeshes.size() > 1) {
+                        throw DeadlyImportError("Morphing target mesh must be a single");
+                    }
+                    aimesh = CreateMesh(pParser, targetMesh, targetMesh->mSubMeshes.at(0), nullptr, 0, 0);
+                    mTargetMeshes.push_back(aimesh);
+                }
+                targetMeshes.push_back(aimesh);
+            }
+            for (float mValue : weightData.mValues) {
+                targetWeights.push_back(mValue);
+            }
+        }
+    }
+    if (!targetMeshes.empty() && targetWeights.size() == targetMeshes.size()) {
+        std::vector<aiAnimMesh *> animMeshes;
+        for (unsigned int i = 0; i < targetMeshes.size(); ++i) {
+            aiMesh *targetMesh = targetMeshes.at(i);
+            aiAnimMesh *animMesh = aiCreateAnimMesh(targetMesh);
+            float weight = targetWeights[i];
+            animMesh->mWeight = weight == 0 ? 1.0f : weight;
+            animMesh->mName = targetMesh->mName;
+            animMeshes.push_back(animMesh);
+        }
+        dstMesh->mMethod = (method == Relative) ? aiMorphingMethod_MORPH_RELATIVE : aiMorphingMethod_MORPH_NORMALIZED;
+        dstMesh->mAnimMeshes = new aiAnimMesh *[animMeshes.size()];
+        dstMesh->mNumAnimMeshes = static_cast<unsigned int>(animMeshes.size());
+        for (unsigned int i = 0; i < animMeshes.size(); ++i) {
+            dstMesh->mAnimMeshes[i] = animMeshes.at(i);
+        }
+    }
+
+    // create bones if given
+    if (pSrcController && pSrcController->mType == Collada::Skin) {
+        // resolve references - joint names
+        const Collada::Accessor &jointNamesAcc = pParser.ResolveLibraryReference(pParser.mAccessorLibrary, pSrcController->mJointNameSource);
+        const Collada::Data &jointNames = pParser.ResolveLibraryReference(pParser.mDataLibrary, jointNamesAcc.mSource);
+        // joint offset matrices
+        const Collada::Accessor &jointMatrixAcc = pParser.ResolveLibraryReference(pParser.mAccessorLibrary, pSrcController->mJointOffsetMatrixSource);
+        const Collada::Data &jointMatrices = pParser.ResolveLibraryReference(pParser.mDataLibrary, jointMatrixAcc.mSource);
+        // joint vertex_weight name list - should refer to the same list as the joint names above. If not, report and reconsider
+        const Collada::Accessor &weightNamesAcc = pParser.ResolveLibraryReference(pParser.mAccessorLibrary, pSrcController->mWeightInputJoints.mAccessor);
+        if (&weightNamesAcc != &jointNamesAcc)
+            throw DeadlyImportError("Temporary implementational laziness. If you read this, please report to the author.");
+        // vertex weights
+        const Collada::Accessor &weightsAcc = pParser.ResolveLibraryReference(pParser.mAccessorLibrary, pSrcController->mWeightInputWeights.mAccessor);
+        const Collada::Data &weights = pParser.ResolveLibraryReference(pParser.mDataLibrary, weightsAcc.mSource);
+
+        if (!jointNames.mIsStringArray || jointMatrices.mIsStringArray || weights.mIsStringArray) {
+            throw DeadlyImportError("Data type mismatch while resolving mesh joints");
+        }
+        // sanity check: we rely on the vertex weights always coming as pairs of BoneIndex-WeightIndex
+        if (pSrcController->mWeightInputJoints.mOffset != 0 || pSrcController->mWeightInputWeights.mOffset != 1) {
+            throw DeadlyImportError("Unsupported vertex_weight addressing scheme. ");
+        }
+
+        // create containers to collect the weights for each bone
+        size_t numBones = jointNames.mStrings.size();
+        std::vector<std::vector<aiVertexWeight>> dstBones(numBones);
+
+        // build a temporary array of pointers to the start of each vertex's weights
+        using IndexPairVector = std::vector<std::pair<size_t, size_t>>;
+        std::vector<IndexPairVector::const_iterator> weightStartPerVertex;
+        weightStartPerVertex.resize(pSrcController->mWeightCounts.size(), pSrcController->mWeights.end());
+
+        IndexPairVector::const_iterator pit = pSrcController->mWeights.begin();
+        for (size_t a = 0; a < pSrcController->mWeightCounts.size(); ++a) {
+            weightStartPerVertex[a] = pit;
+            pit += pSrcController->mWeightCounts[a];
+        }
+
+        // now for each vertex put the corresponding vertex weights into each bone's weight collection
+        for (size_t a = pStartVertex; a < pStartVertex + numVertices; ++a) {
+            // which position index was responsible for this vertex? that's also the index by which
+            // the controller assigns the vertex weights
+            size_t orgIndex = pSrcMesh->mFacePosIndices[a];
+            // find the vertex weights for this vertex
+            IndexPairVector::const_iterator iit = weightStartPerVertex[orgIndex];
+            size_t pairCount = pSrcController->mWeightCounts[orgIndex];
+
+            for (size_t b = 0; b < pairCount; ++b, ++iit) {
+                const size_t jointIndex = iit->first;
+                const size_t vertexIndex = iit->second;
+                ai_real weight = 1.0f;
+                if (!weights.mValues.empty()) {
+                    weight = ReadFloat(weightsAcc, weights, vertexIndex, 0);
+                }
+
+                // one day I gonna kill that XSI Collada exporter
+                if (weight > 0.0f) {
+                    aiVertexWeight w;
+                    w.mVertexId = static_cast<unsigned int>(a - pStartVertex);
+                    w.mWeight = weight;
+                    dstBones[jointIndex].push_back(w);
+                }
+            }
+        }
+
+        // count the number of bones which influence vertices of the current submesh
+        size_t numRemainingBones = 0;
+        for (const auto & dstBone : dstBones) {
+            if (!dstBone.empty()) {
+                ++numRemainingBones;
+            }
+        }
+
+        // create bone array and copy bone weights one by one
+        dstMesh->mNumBones = static_cast<unsigned int>(numRemainingBones);
+        dstMesh->mBones = new aiBone *[numRemainingBones];
+        size_t boneCount = 0;
+        for (size_t a = 0; a < numBones; ++a) {
+            // omit bones without weights
+            if (dstBones[a].empty()) {
+                continue;
+            }
+
+            // create bone with its weights
+            aiBone *bone = new aiBone;
+            bone->mName = ReadString(jointNamesAcc, jointNames, a);
+            bone->mOffsetMatrix.a1 = ReadFloat(jointMatrixAcc, jointMatrices, a, 0);
+            bone->mOffsetMatrix.a2 = ReadFloat(jointMatrixAcc, jointMatrices, a, 1);
+            bone->mOffsetMatrix.a3 = ReadFloat(jointMatrixAcc, jointMatrices, a, 2);
+            bone->mOffsetMatrix.a4 = ReadFloat(jointMatrixAcc, jointMatrices, a, 3);
+            bone->mOffsetMatrix.b1 = ReadFloat(jointMatrixAcc, jointMatrices, a, 4);
+            bone->mOffsetMatrix.b2 = ReadFloat(jointMatrixAcc, jointMatrices, a, 5);
+            bone->mOffsetMatrix.b3 = ReadFloat(jointMatrixAcc, jointMatrices, a, 6);
+            bone->mOffsetMatrix.b4 = ReadFloat(jointMatrixAcc, jointMatrices, a, 7);
+            bone->mOffsetMatrix.c1 = ReadFloat(jointMatrixAcc, jointMatrices, a, 8);
+            bone->mOffsetMatrix.c2 = ReadFloat(jointMatrixAcc, jointMatrices, a, 9);
+            bone->mOffsetMatrix.c3 = ReadFloat(jointMatrixAcc, jointMatrices, a, 10);
+            bone->mOffsetMatrix.c4 = ReadFloat(jointMatrixAcc, jointMatrices, a, 11);
+            bone->mNumWeights = static_cast<unsigned int>(dstBones[a].size());
+            bone->mWeights = new aiVertexWeight[bone->mNumWeights];
+            std::copy(dstBones[a].begin(), dstBones[a].end(), bone->mWeights);
+
+            // apply bind shape matrix to offset matrix
+            aiMatrix4x4 bindShapeMatrix;
+            bindShapeMatrix.a1 = pSrcController->mBindShapeMatrix[0];
+            bindShapeMatrix.a2 = pSrcController->mBindShapeMatrix[1];
+            bindShapeMatrix.a3 = pSrcController->mBindShapeMatrix[2];
+            bindShapeMatrix.a4 = pSrcController->mBindShapeMatrix[3];
+            bindShapeMatrix.b1 = pSrcController->mBindShapeMatrix[4];
+            bindShapeMatrix.b2 = pSrcController->mBindShapeMatrix[5];
+            bindShapeMatrix.b3 = pSrcController->mBindShapeMatrix[6];
+            bindShapeMatrix.b4 = pSrcController->mBindShapeMatrix[7];
+            bindShapeMatrix.c1 = pSrcController->mBindShapeMatrix[8];
+            bindShapeMatrix.c2 = pSrcController->mBindShapeMatrix[9];
+            bindShapeMatrix.c3 = pSrcController->mBindShapeMatrix[10];
+            bindShapeMatrix.c4 = pSrcController->mBindShapeMatrix[11];
+            bindShapeMatrix.d1 = pSrcController->mBindShapeMatrix[12];
+            bindShapeMatrix.d2 = pSrcController->mBindShapeMatrix[13];
+            bindShapeMatrix.d3 = pSrcController->mBindShapeMatrix[14];
+            bindShapeMatrix.d4 = pSrcController->mBindShapeMatrix[15];
+            bone->mOffsetMatrix *= bindShapeMatrix;
+
+            // HACK: (thom) Some exporters address the bone nodes by SID, others address them by ID or even name.
+            // Therefore I added a little name replacement here: I search for the bone's node by either name, ID or SID,
+            // and replace the bone's name by the node's name so that the user can use the standard
+            // find-by-name method to associate nodes with bones.
+            const Collada::Node *bnode = FindNode(pParser.mRootNode, bone->mName.data);
+            if (nullptr == bnode) {
+                bnode = FindNodeBySID(pParser.mRootNode, bone->mName.data);
+            }
+
+            // assign the name that we would have assigned for the source node
+            if (nullptr != bnode) {
+                bone->mName.Set(FindNameForNode(bnode));
+            } else {
+                ASSIMP_LOG_WARN("ColladaLoader::CreateMesh(): could not find corresponding node for joint \"", bone->mName.data, "\".");
+            }
+
+            // and insert bone
+            dstMesh->mBones[boneCount++] = bone;
+        }
+    }
+
+    return dstMesh.release();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Stores all meshes in the given scene
+void ColladaLoader::StoreSceneMeshes(aiScene *pScene) {
+    pScene->mNumMeshes = static_cast<unsigned int>(mMeshes.size());
+    if (mMeshes.empty()) {
+        return;
+    }
+    pScene->mMeshes = new aiMesh *[mMeshes.size()];
+    std::copy(mMeshes.begin(), mMeshes.end(), pScene->mMeshes);
+    mMeshes.clear();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Stores all cameras in the given scene
+void ColladaLoader::StoreSceneCameras(aiScene *pScene) {
+    pScene->mNumCameras = static_cast<unsigned int>(mCameras.size());
+    if (mCameras.empty()) {
+        return;
+    }
+    pScene->mCameras = new aiCamera *[mCameras.size()];
+    std::copy(mCameras.begin(), mCameras.end(), pScene->mCameras);
+    mCameras.clear();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Stores all lights in the given scene
+void ColladaLoader::StoreSceneLights(aiScene *pScene) {
+    pScene->mNumLights = static_cast<unsigned int>(mLights.size());
+    if (mLights.empty()) {
+        return;
+    }
+    pScene->mLights = new aiLight *[mLights.size()];
+    std::copy(mLights.begin(), mLights.end(), pScene->mLights);
+    mLights.clear();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Stores all textures in the given scene
+void ColladaLoader::StoreSceneTextures(aiScene *pScene) {
+    pScene->mNumTextures = static_cast<unsigned int>(mTextures.size());
+    if (mTextures.empty()) {
+        return;
+    }
+    pScene->mTextures = new aiTexture *[mTextures.size()];
+    std::copy(mTextures.begin(), mTextures.end(), pScene->mTextures);
+    mTextures.clear();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Stores all materials in the given scene
+void ColladaLoader::StoreSceneMaterials(aiScene *pScene) {
+    pScene->mNumMaterials = static_cast<unsigned int>(newMats.size());
+    if (newMats.empty()) {
+        return;
+    }
+    pScene->mMaterials = new aiMaterial *[newMats.size()];
+    for (unsigned int i = 0; i < newMats.size(); ++i) {
+        pScene->mMaterials[i] = newMats[i].second;
+    }
+    newMats.clear();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Stores all animations
+void ColladaLoader::StoreAnimations(aiScene *pScene, const ColladaParser &pParser) {
+    // recursively collect all animations from the collada scene
+    StoreAnimations(pScene, pParser, &pParser.mAnims, "");
+
+    // catch special case: many animations with the same length, each affecting only a single node.
+    // we need to unite all those single-node-anims to a proper combined animation
+    for (size_t a = 0; a < mAnims.size(); ++a) {
+        aiAnimation *templateAnim = mAnims[a];
+
+        if (templateAnim->mNumChannels == 1) {
+            // search for other single-channel-anims with the same duration
+            std::vector<size_t> collectedAnimIndices;
+            for (size_t b = a + 1; b < mAnims.size(); ++b) {
+                aiAnimation *other = mAnims[b];
+                if (other->mNumChannels == 1 && other->mDuration == templateAnim->mDuration &&
+                        other->mTicksPerSecond == templateAnim->mTicksPerSecond)
+                    collectedAnimIndices.push_back(b);
+            }
+
+            // We only want to combine the animations if they have different channels
+            std::set<std::string> animTargets;
+            animTargets.insert(templateAnim->mChannels[0]->mNodeName.C_Str());
+            bool collectedAnimationsHaveDifferentChannels = true;
+            for (unsigned long long collectedAnimIndice : collectedAnimIndices) {
+                aiAnimation *srcAnimation = mAnims[(int)collectedAnimIndice];
+                std::string channelName = std::string(srcAnimation->mChannels[0]->mNodeName.C_Str());
+                if (animTargets.find(channelName) == animTargets.end()) {
+                    animTargets.insert(channelName);
+                } else {
+                    collectedAnimationsHaveDifferentChannels = false;
+                    break;
+                }
+            }
+
+            if (!collectedAnimationsHaveDifferentChannels) {
+                continue;
+            }
+
+            // if there are other animations which fit the template anim, combine all channels into a single anim
+            if (!collectedAnimIndices.empty()) {
+                aiAnimation *combinedAnim = new aiAnimation();
+                combinedAnim->mName = aiString(std::string("combinedAnim_") + char('0' + a));
+                combinedAnim->mDuration = templateAnim->mDuration;
+                combinedAnim->mTicksPerSecond = templateAnim->mTicksPerSecond;
+                combinedAnim->mNumChannels = static_cast<unsigned int>(collectedAnimIndices.size() + 1);
+                combinedAnim->mChannels = new aiNodeAnim *[combinedAnim->mNumChannels];
+                // add the template anim as first channel by moving its aiNodeAnim to the combined animation
+                combinedAnim->mChannels[0] = templateAnim->mChannels[0];
+                templateAnim->mChannels[0] = nullptr;
+                delete templateAnim;
+                // combined animation replaces template animation in the anim array
+                mAnims[a] = combinedAnim;
+
+                // move the memory of all other anims to the combined anim and erase them from the source anims
+                for (size_t b = 0; b < collectedAnimIndices.size(); ++b) {
+                    aiAnimation *srcAnimation = mAnims[collectedAnimIndices[b]];
+                    combinedAnim->mChannels[1 + b] = srcAnimation->mChannels[0];
+                    srcAnimation->mChannels[0] = nullptr;
+                    delete srcAnimation;
+                }
+
+                // in a second go, delete all the single-channel-anims that we've stripped from their channels
+                // back to front to preserve indices - you know, removing an element from a vector moves all elements behind the removed one
+                while (!collectedAnimIndices.empty()) {
+                    mAnims.erase(mAnims.begin() + collectedAnimIndices.back());
+                    collectedAnimIndices.pop_back();
+                }
+            }
+        }
+    }
+
+    // now store all anims in the scene
+    if (!mAnims.empty()) {
+        pScene->mNumAnimations = static_cast<unsigned int>(mAnims.size());
+        pScene->mAnimations = new aiAnimation *[mAnims.size()];
+        std::copy(mAnims.begin(), mAnims.end(), pScene->mAnimations);
+    }
+
+    mAnims.clear();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Constructs the animations for the given source anim
+void ColladaLoader::StoreAnimations(aiScene *pScene, const ColladaParser &pParser, const Animation *pSrcAnim, const std::string &pPrefix) {
+    std::string animName = pPrefix.empty() ? pSrcAnim->mName : pPrefix + "_" + pSrcAnim->mName;
+
+    // create nested animations, if given
+    for (auto mSubAnim : pSrcAnim->mSubAnims) {
+        StoreAnimations(pScene, pParser, mSubAnim, animName);
+    }
+
+    // create animation channels, if any
+    if (!pSrcAnim->mChannels.empty()) {
+        CreateAnimation(pScene, pParser, pSrcAnim, animName);
+    }
+}
+
+struct MorphTimeValues {
+    float mTime;
+    struct key {
+        float mWeight;
+        unsigned int mValue;
+    };
+    std::vector<key> mKeys;
+};
+
+void insertMorphTimeValue(std::vector<MorphTimeValues> &values, float time, float weight, unsigned int value) {
+    MorphTimeValues::key k;
+    k.mValue = value;
+    k.mWeight = weight;
+    if (values.empty() || time < values[0].mTime) {
+        MorphTimeValues val;
+        val.mTime = time;
+        val.mKeys.push_back(k);
+        values.insert(values.begin(), val);
+        return;
+    }
+    if (time > values.back().mTime) {
+        MorphTimeValues val;
+        val.mTime = time;
+        val.mKeys.push_back(k);
+        values.insert(values.end(), val);
+        return;
+    }
+    for (unsigned int i = 0; i < values.size(); i++) {
+        if (std::abs(time - values[i].mTime) < ai_epsilon) {
+            values[i].mKeys.push_back(k);
+            return;
+        } else if (time > values[i].mTime && time < values[i + 1].mTime) {
+            MorphTimeValues val;
+            val.mTime = time;
+            val.mKeys.push_back(k);
+            values.insert(values.begin() + i, val);
+            return;
+        }
+    }
+}
+
+static float getWeightAtKey(const std::vector<MorphTimeValues> &values, int key, unsigned int value) {
+    for (auto mKey : values[key].mKeys) {
+        if (mKey.mValue == value) {
+            return mKey.mWeight;
+        }
+    }
+    // no value at key found, try to interpolate if present at other keys. if not, return zero
+    // TODO: interpolation
+    return 0.0f;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Constructs the animation for the given source anim
+void ColladaLoader::CreateAnimation(aiScene *pScene, const ColladaParser &pParser, const Animation *pSrcAnim, const std::string &pName) {
+    // collect a list of animatable nodes
+    std::vector<const aiNode *> nodes;
+    CollectNodes(pScene->mRootNode, nodes);
+
+    std::vector<aiNodeAnim *> anims;
+    std::vector<aiMeshMorphAnim *> morphAnims;
+
+    for (auto node : nodes) {
+        // find all the collada anim channels which refer to the current node
+        std::vector<ChannelEntry> entries;
+        std::string nodeName = node->mName.data;
+
+        // find the collada node corresponding to the aiNode
+        const Node *srcNode = FindNode(pParser.mRootNode, nodeName);
+        if (!srcNode) {
+            continue;
+        }
+
+        // now check all channels if they affect the current node
+        std::string targetID, subElement;
+        for (std::vector<AnimationChannel>::const_iterator cit = pSrcAnim->mChannels.begin();
+                cit != pSrcAnim->mChannels.end(); ++cit) {
+            const AnimationChannel &srcChannel = *cit;
+            ChannelEntry entry;
+
+            // we expect the animation target to be of type "nodeName/transformID.subElement". Ignore all others
+            // find the slash that separates the node name - there should be only one
+            std::string::size_type slashPos = srcChannel.mTarget.find('/');
+            if (slashPos == std::string::npos) {
+                std::string::size_type targetPos = srcChannel.mTarget.find(srcNode->mID);
+                if (targetPos == std::string::npos) {
+                    continue;
+                }
+
+                // not node transform, but something else. store as unknown animation channel for now
+                entry.mChannel = &(*cit);
+                entry.mTargetId = srcChannel.mTarget.substr(targetPos + pSrcAnim->mName.length(),
+                        srcChannel.mTarget.length() - targetPos - pSrcAnim->mName.length());
+                if (entry.mTargetId.front() == '-') {
+                    entry.mTargetId = entry.mTargetId.substr(1);
+                }
+                entries.push_back(entry);
+                continue;
+            }
+            if (srcChannel.mTarget.find('/', slashPos + 1) != std::string::npos) {
+                continue;
+            }
+
+            targetID.clear();
+            targetID = srcChannel.mTarget.substr(0, slashPos);
+            if (targetID != srcNode->mID) {
+                continue;
+            }
+
+            // find the dot that separates the transformID - there should be only one or zero
+            std::string::size_type dotPos = srcChannel.mTarget.find('.');
+            if (dotPos != std::string::npos) {
+                if (srcChannel.mTarget.find('.', dotPos + 1) != std::string::npos) {
+                    continue;
+                }
+
+                entry.mTransformId = srcChannel.mTarget.substr(slashPos + 1, dotPos - slashPos - 1);
+
+                subElement.clear();
+                subElement = srcChannel.mTarget.substr(dotPos + 1);
+                if (subElement == "ANGLE")
+                    entry.mSubElement = 3; // last number in an Axis-Angle-Transform is the angle
+                else if (subElement == "X")
+                    entry.mSubElement = 0;
+                else if (subElement == "Y")
+                    entry.mSubElement = 1;
+                else if (subElement == "Z")
+                    entry.mSubElement = 2;
+                else
+                    ASSIMP_LOG_WARN("Unknown anim subelement <", subElement, ">. Ignoring");
+            } else {
+                // no sub-element following, transformId is remaining string
+                entry.mTransformId = srcChannel.mTarget.substr(slashPos + 1);
+            }
+
+            std::string::size_type bracketPos = srcChannel.mTarget.find('(');
+            if (bracketPos != std::string::npos) {
+                entry.mTransformId = srcChannel.mTarget.substr(slashPos + 1, bracketPos - slashPos - 1);
+                subElement.clear();
+                subElement = srcChannel.mTarget.substr(bracketPos);
+
+                if (subElement == "(0)(0)")
+                    entry.mSubElement = 0;
+                else if (subElement == "(1)(0)")
+                    entry.mSubElement = 1;
+                else if (subElement == "(2)(0)")
+                    entry.mSubElement = 2;
+                else if (subElement == "(3)(0)")
+                    entry.mSubElement = 3;
+                else if (subElement == "(0)(1)")
+                    entry.mSubElement = 4;
+                else if (subElement == "(1)(1)")
+                    entry.mSubElement = 5;
+                else if (subElement == "(2)(1)")
+                    entry.mSubElement = 6;
+                else if (subElement == "(3)(1)")
+                    entry.mSubElement = 7;
+                else if (subElement == "(0)(2)")
+                    entry.mSubElement = 8;
+                else if (subElement == "(1)(2)")
+                    entry.mSubElement = 9;
+                else if (subElement == "(2)(2)")
+                    entry.mSubElement = 10;
+                else if (subElement == "(3)(2)")
+                    entry.mSubElement = 11;
+                else if (subElement == "(0)(3)")
+                    entry.mSubElement = 12;
+                else if (subElement == "(1)(3)")
+                    entry.mSubElement = 13;
+                else if (subElement == "(2)(3)")
+                    entry.mSubElement = 14;
+                else if (subElement == "(3)(3)")
+                    entry.mSubElement = 15;
+            }
+
+            // determine which transform step is affected by this channel
+            entry.mTransformIndex = SIZE_MAX;
+            for (size_t a = 0; a < srcNode->mTransforms.size(); ++a)
+                if (srcNode->mTransforms[a].mID == entry.mTransformId)
+                    entry.mTransformIndex = a;
+
+            if (entry.mTransformIndex == SIZE_MAX) {
+                if (entry.mTransformId.find("morph-weights") == std::string::npos) {
+                    continue;
+                }
+                entry.mTargetId = entry.mTransformId;
+                entry.mTransformId = std::string();
+            }
+
+            entry.mChannel = &(*cit);
+            entries.push_back(entry);
+        }
+
+        // if there's no channel affecting the current node, we skip it
+        if (entries.empty()) {
+            continue;
+        }
+
+        // resolve the data pointers for all anim channels. Find the minimum time while we're at it
+        ai_real startTime = ai_real(1e20), endTime = ai_real(-1e20);
+        for (ChannelEntry & e : entries) {
+            e.mTimeAccessor = &pParser.ResolveLibraryReference(pParser.mAccessorLibrary, e.mChannel->mSourceTimes);
+            e.mTimeData = &pParser.ResolveLibraryReference(pParser.mDataLibrary, e.mTimeAccessor->mSource);
+            e.mValueAccessor = &pParser.ResolveLibraryReference(pParser.mAccessorLibrary, e.mChannel->mSourceValues);
+            e.mValueData = &pParser.ResolveLibraryReference(pParser.mDataLibrary, e.mValueAccessor->mSource);
+
+            // time count and value count must match
+            if (e.mTimeAccessor->mCount != e.mValueAccessor->mCount) {
+                throw DeadlyImportError("Time count / value count mismatch in animation channel \"", e.mChannel->mTarget, "\".");
+            }
+
+            if (e.mTimeAccessor->mCount > 0) {
+                // find bounding times
+                startTime = std::min(startTime, ReadFloat(*e.mTimeAccessor, *e.mTimeData, 0, 0));
+                endTime = std::max(endTime, ReadFloat(*e.mTimeAccessor, *e.mTimeData, e.mTimeAccessor->mCount - 1, 0));
+            }
+        }
+
+        std::vector<aiMatrix4x4> resultTrafos;
+        if (!entries.empty() && entries.front().mTimeAccessor->mCount > 0) {
+            // create a local transformation chain of the node's transforms
+            std::vector<Collada::Transform> transforms = srcNode->mTransforms;
+
+            // now for every unique point in time, find or interpolate the key values for that time
+            // and apply them to the transform chain. Then the node's present transformation can be calculated.
+            ai_real time = startTime;
+            while (1) {
+                for (ChannelEntry & e : entries) {
+                    // find the keyframe behind the current point in time
+                    size_t pos = 0;
+                    ai_real postTime = 0.0;
+                    while (1) {
+                        if (pos >= e.mTimeAccessor->mCount) {
+                            break;
+                        }
+                        postTime = ReadFloat(*e.mTimeAccessor, *e.mTimeData, pos, 0);
+                        if (postTime >= time) {
+                            break;
+                        }
+                        ++pos;
+                    }
+
+                    pos = std::min(pos, e.mTimeAccessor->mCount - 1);
+
+                    // read values from there
+                    ai_real temp[16];
+                    for (size_t c = 0; c < e.mValueAccessor->mSize; ++c) {
+                        temp[c] = ReadFloat(*e.mValueAccessor, *e.mValueData, pos, c);
+                    }
+
+                    // if not exactly at the key time, interpolate with previous value set
+                    if (postTime > time && pos > 0) {
+                        ai_real preTime = ReadFloat(*e.mTimeAccessor, *e.mTimeData, pos - 1, 0);
+                        ai_real factor = (time - postTime) / (preTime - postTime);
+
+                        for (size_t c = 0; c < e.mValueAccessor->mSize; ++c) {
+                            ai_real v = ReadFloat(*e.mValueAccessor, *e.mValueData, pos - 1, c);
+                            temp[c] += (v - temp[c]) * factor;
+                        }
+                    }
+
+                    // Apply values to current transformation
+                    std::copy(temp, temp + e.mValueAccessor->mSize, transforms[e.mTransformIndex].f + e.mSubElement);
+                }
+
+                // Calculate resulting transformation
+                aiMatrix4x4 mat = pParser.CalculateResultTransform(transforms);
+
+                // out of laziness: we store the time in matrix.d4
+                mat.d4 = time;
+                resultTrafos.push_back(mat);
+
+                // find next point in time to evaluate. That's the closest frame larger than the current in any channel
+                ai_real nextTime = ai_real(1e20);
+                for (ChannelEntry & channelElement : entries) {
+                    // find the next time value larger than the current
+                    size_t pos = 0;
+                    while (pos < channelElement.mTimeAccessor->mCount) {
+                        const ai_real t = ReadFloat(*channelElement.mTimeAccessor, *channelElement.mTimeData, pos, 0);
+                        if (t > time) {
+                            nextTime = std::min(nextTime, t);
+                            break;
+                        }
+                        ++pos;
+                    }
+
+                    // https://github.com/assimp/assimp/issues/458
+                    // Sub-sample axis-angle channels if the delta between two consecutive
+                    // key-frame angles is >= 180 degrees.
+                    if (transforms[channelElement.mTransformIndex].mType == TF_ROTATE && channelElement.mSubElement == 3 && pos > 0 && pos < channelElement.mTimeAccessor->mCount) {
+                        const ai_real cur_key_angle = ReadFloat(*channelElement.mValueAccessor, *channelElement.mValueData, pos, 0);
+                        const ai_real last_key_angle = ReadFloat(*channelElement.mValueAccessor, *channelElement.mValueData, pos - 1, 0);
+                        const ai_real cur_key_time = ReadFloat(*channelElement.mTimeAccessor, *channelElement.mTimeData, pos, 0);
+                        const ai_real last_key_time = ReadFloat(*channelElement.mTimeAccessor, *channelElement.mTimeData, pos - 1, 0);
+                        const ai_real last_eval_angle = last_key_angle + (cur_key_angle - last_key_angle) * (time - last_key_time) / (cur_key_time - last_key_time);
+                        const ai_real delta = std::abs(cur_key_angle - last_eval_angle);
+                        if (delta >= 180.0) {
+                            const int subSampleCount = static_cast<int>(std::floor(delta / 90.0));
+                            if (cur_key_time != time) {
+                                const ai_real nextSampleTime = time + (cur_key_time - time) / subSampleCount;
+                                nextTime = std::min(nextTime, nextSampleTime);
+                            }
+                        }
+                    }
+                }
+
+                // no more keys on any channel after the current time -> we're done
+                if (nextTime > 1e19) {
+                    break;
+                }
+
+                // else construct next key-frame at this following time point
+                time = nextTime;
+            }
+        }
+
+        // build an animation channel for the given node out of these trafo keys
+        if (!resultTrafos.empty()) {
+            aiNodeAnim *dstAnim = new aiNodeAnim;
+            dstAnim->mNodeName = nodeName;
+            dstAnim->mNumPositionKeys = static_cast<unsigned int>(resultTrafos.size());
+            dstAnim->mNumRotationKeys = static_cast<unsigned int>(resultTrafos.size());
+            dstAnim->mNumScalingKeys = static_cast<unsigned int>(resultTrafos.size());
+            dstAnim->mPositionKeys = new aiVectorKey[resultTrafos.size()];
+            dstAnim->mRotationKeys = new aiQuatKey[resultTrafos.size()];
+            dstAnim->mScalingKeys = new aiVectorKey[resultTrafos.size()];
+
+            for (size_t a = 0; a < resultTrafos.size(); ++a) {
+                aiMatrix4x4 mat = resultTrafos[a];
+                double time = double(mat.d4); // remember? time is stored in mat.d4
+                mat.d4 = 1.0f;
+
+                dstAnim->mPositionKeys[a].mTime = time * kMillisecondsFromSeconds;
+                dstAnim->mRotationKeys[a].mTime = time * kMillisecondsFromSeconds;
+                dstAnim->mScalingKeys[a].mTime = time * kMillisecondsFromSeconds;
+                mat.Decompose(dstAnim->mScalingKeys[a].mValue, dstAnim->mRotationKeys[a].mValue, dstAnim->mPositionKeys[a].mValue);
+            }
+
+            anims.push_back(dstAnim);
+        } else {
+            ASSIMP_LOG_WARN("Collada loader: found empty animation channel, ignored. Please check your exporter.");
+        }
+
+        if (!entries.empty() && entries.front().mTimeAccessor->mCount > 0) {
+            std::vector<ChannelEntry> morphChannels;
+            for (ChannelEntry & e : entries) {
+                // skip non-transform types
+                if (e.mTargetId.empty()) {
+                    continue;
+                }
+
+                if (e.mTargetId.find("morph-weights") != std::string::npos) {
+                    morphChannels.push_back(e);
+                }
+            }
+            if (!morphChannels.empty()) {
+                // either 1) morph weight animation count should contain morph target count channels
+                // or     2) one channel with morph target count arrays
+                // assume first
+
+                aiMeshMorphAnim *morphAnim = new aiMeshMorphAnim;
+                morphAnim->mName.Set(nodeName);
+
+                std::vector<MorphTimeValues> morphTimeValues;
+                int morphAnimChannelIndex = 0;
+                for (ChannelEntry & e : morphChannels) {
+                    std::string::size_type apos = e.mTargetId.find('(');
+                    std::string::size_type bpos = e.mTargetId.find(')');
+
+                    // If unknown way to specify weight -> ignore this animation
+                    if (apos == std::string::npos || bpos == std::string::npos) {
+                        continue;
+                    }
+
+                    // weight target can be in format Weight_M_N, Weight_N, WeightN, or some other way
+                    // we ignore the name and just assume the channels are in the right order
+                    for (unsigned int i = 0; i < e.mTimeData->mValues.size(); i++) {
+                        insertMorphTimeValue(morphTimeValues, e.mTimeData->mValues[i], e.mValueData->mValues[i], morphAnimChannelIndex);
+                    }
+
+                    ++morphAnimChannelIndex;
+                }
+
+                morphAnim->mNumKeys = static_cast<unsigned int>(morphTimeValues.size());
+                morphAnim->mKeys = new aiMeshMorphKey[morphAnim->mNumKeys];
+                for (unsigned int key = 0; key < morphAnim->mNumKeys; key++) {
+                    morphAnim->mKeys[key].mNumValuesAndWeights = static_cast<unsigned int>(morphChannels.size());
+                    morphAnim->mKeys[key].mValues = new unsigned int[morphChannels.size()];
+                    morphAnim->mKeys[key].mWeights = new double[morphChannels.size()];
+
+                    morphAnim->mKeys[key].mTime = morphTimeValues[key].mTime * kMillisecondsFromSeconds;
+                    for (unsigned int valueIndex = 0; valueIndex < morphChannels.size(); ++valueIndex) {
+                        morphAnim->mKeys[key].mValues[valueIndex] = valueIndex;
+                        morphAnim->mKeys[key].mWeights[valueIndex] = getWeightAtKey(morphTimeValues, key, valueIndex);
+                    }
+                }
+
+                morphAnims.push_back(morphAnim);
+            }
+        }
+    }
+
+    if (!anims.empty() || !morphAnims.empty()) {
+        aiAnimation *anim = new aiAnimation;
+        anim->mName.Set(pName);
+        anim->mNumChannels = static_cast<unsigned int>(anims.size());
+        if (anim->mNumChannels > 0) {
+            anim->mChannels = new aiNodeAnim *[anims.size()];
+            std::copy(anims.begin(), anims.end(), anim->mChannels);
+        }
+        anim->mNumMorphMeshChannels = static_cast<unsigned int>(morphAnims.size());
+        if (anim->mNumMorphMeshChannels > 0) {
+            anim->mMorphMeshChannels = new aiMeshMorphAnim *[anim->mNumMorphMeshChannels];
+            std::copy(morphAnims.begin(), morphAnims.end(), anim->mMorphMeshChannels);
+        }
+        anim->mDuration = 0.0f;
+        for (auto & a : anims) {
+            anim->mDuration = std::max(anim->mDuration, a->mPositionKeys[a->mNumPositionKeys - 1].mTime);
+            anim->mDuration = std::max(anim->mDuration, a->mRotationKeys[a->mNumRotationKeys - 1].mTime);
+            anim->mDuration = std::max(anim->mDuration, a->mScalingKeys[a->mNumScalingKeys - 1].mTime);
+        }
+        for (auto & morphAnim : morphAnims) {
+            anim->mDuration = std::max(anim->mDuration, morphAnim->mKeys[morphAnim->mNumKeys - 1].mTime);
+        }
+        anim->mTicksPerSecond = 1000.0;
+        mAnims.push_back(anim);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Add a texture to a material structure
+void ColladaLoader::AddTexture(aiMaterial &mat,
+        const ColladaParser &pParser,
+        const Effect &effect,
+        const Sampler &sampler,
+        aiTextureType type,
+        unsigned int idx) {
+    // first of all, basic file name
+    const aiString name = FindFilenameForEffectTexture(pParser, effect, sampler.mName);
+    mat.AddProperty(&name, _AI_MATKEY_TEXTURE_BASE, type, idx);
+
+    // mapping mode
+    int map = aiTextureMapMode_Clamp;
+    if (sampler.mWrapU) {
+        map = aiTextureMapMode_Wrap;
+    }
+    if (sampler.mWrapU && sampler.mMirrorU) {
+        map = aiTextureMapMode_Mirror;
+    }
+
+    mat.AddProperty(&map, 1, _AI_MATKEY_MAPPINGMODE_U_BASE, type, idx);
+
+    map = aiTextureMapMode_Clamp;
+    if (sampler.mWrapV) {
+        map = aiTextureMapMode_Wrap;
+    }
+    if (sampler.mWrapV && sampler.mMirrorV) {
+        map = aiTextureMapMode_Mirror;
+    }
+
+    mat.AddProperty(&map, 1, _AI_MATKEY_MAPPINGMODE_V_BASE, type, idx);
+
+    // UV transformation
+    mat.AddProperty(&sampler.mTransform, 1,
+            _AI_MATKEY_UVTRANSFORM_BASE, type, idx);
+
+    // Blend mode
+    mat.AddProperty((int *)&sampler.mOp, 1,
+            _AI_MATKEY_TEXBLEND_BASE, type, idx);
+
+    // Blend factor
+    mat.AddProperty((ai_real *)&sampler.mWeighting, 1,
+            _AI_MATKEY_TEXBLEND_BASE, type, idx);
+
+    // UV source index ... if we didn't resolve the mapping, it is actually just
+    // a guess but it works in most cases. We search for the frst occurrence of a
+    // number in the channel name. We assume it is the zero-based index into the
+    // UV channel array of all corresponding meshes. It could also be one-based
+    // for some exporters, but we won't care of it unless someone complains about.
+    if (sampler.mUVId != UINT_MAX) {
+        map = sampler.mUVId;
+    } else {
+        map = -1;
+        for (std::string::const_iterator it = sampler.mUVChannel.begin(); it != sampler.mUVChannel.end(); ++it) {
+            if (IsNumeric(*it)) {
+                map = strtoul10(&(*it));        
+                break;
+            }
+        }
+        if (-1 == map) {
+            ASSIMP_LOG_WARN("Collada: unable to determine UV channel for texture");
+            map = 0;
+        }
+    }
+    mat.AddProperty(&map, 1, _AI_MATKEY_UVWSRC_BASE, type, idx);
+}
+
+// ------------------------------------------------------------------------------------------------
+// Fills materials from the collada material definitions
+void ColladaLoader::FillMaterials(const ColladaParser &pParser, aiScene * /*pScene*/) {
+    for (auto &elem : newMats) {
+        aiMaterial &mat = (aiMaterial &)*elem.second;
+        Collada::Effect &effect = *elem.first;
+
+        // resolve shading mode
+        int shadeMode;
+        if (effect.mFaceted) {
+            shadeMode = aiShadingMode_Flat;
+        } else {
+            switch (effect.mShadeType) {
+            case Collada::Shade_Constant:
+                shadeMode = aiShadingMode_NoShading;
+                break;
+            case Collada::Shade_Lambert:
+                shadeMode = aiShadingMode_Gouraud;
+                break;
+            case Collada::Shade_Blinn:
+                shadeMode = aiShadingMode_Blinn;
+                break;
+            case Collada::Shade_Phong:
+                shadeMode = aiShadingMode_Phong;
+                break;
+
+            default:
+                ASSIMP_LOG_WARN("Collada: Unrecognized shading mode, using gouraud shading");
+                shadeMode = aiShadingMode_Gouraud;
+                break;
+            }
+        }
+        mat.AddProperty<int>(&shadeMode, 1, AI_MATKEY_SHADING_MODEL);
+
+        // double-sided?
+        shadeMode = effect.mDoubleSided;
+        mat.AddProperty<int>(&shadeMode, 1, AI_MATKEY_TWOSIDED);
+
+        // wire-frame?
+        shadeMode = effect.mWireframe;
+        mat.AddProperty<int>(&shadeMode, 1, AI_MATKEY_ENABLE_WIREFRAME);
+
+        // add material colors
+        mat.AddProperty(&effect.mAmbient, 1, AI_MATKEY_COLOR_AMBIENT);
+        mat.AddProperty(&effect.mDiffuse, 1, AI_MATKEY_COLOR_DIFFUSE);
+        mat.AddProperty(&effect.mSpecular, 1, AI_MATKEY_COLOR_SPECULAR);
+        mat.AddProperty(&effect.mEmissive, 1, AI_MATKEY_COLOR_EMISSIVE);
+        mat.AddProperty(&effect.mReflective, 1, AI_MATKEY_COLOR_REFLECTIVE);
+
+        // scalar properties
+        mat.AddProperty(&effect.mShininess, 1, AI_MATKEY_SHININESS);
+        mat.AddProperty(&effect.mReflectivity, 1, AI_MATKEY_REFLECTIVITY);
+        mat.AddProperty(&effect.mRefractIndex, 1, AI_MATKEY_REFRACTI);
+
+        // transparency, a very hard one. seemingly not all files are following the
+        // specification here (1.0 transparency => completely opaque)...
+        // therefore, we let the opportunity for the user to manually invert
+        // the transparency if necessary and we add preliminary support for RGB_ZERO mode
+        if (effect.mTransparency >= 0.f && effect.mTransparency <= 1.f) {
+            // handle RGB transparency completely, cf Collada specs 1.5.0 pages 249 and 304
+            if (effect.mRGBTransparency) {
+                // use luminance as defined by ISO/CIE color standards (see ITU-R Recommendation BT.709-4)
+                effect.mTransparency *= (0.212671f * effect.mTransparent.r +
+                                         0.715160f * effect.mTransparent.g +
+                                         0.072169f * effect.mTransparent.b);
+
+                effect.mTransparent.a = 1.f;
+
+                mat.AddProperty(&effect.mTransparent, 1, AI_MATKEY_COLOR_TRANSPARENT);
+            } else {
+                effect.mTransparency *= effect.mTransparent.a;
+            }
+
+            if (effect.mInvertTransparency) {
+                effect.mTransparency = 1.f - effect.mTransparency;
+            }
+
+            // Is the material finally transparent ?
+            if (effect.mHasTransparency || effect.mTransparency < 1.f) {
+                mat.AddProperty(&effect.mTransparency, 1, AI_MATKEY_OPACITY);
+            }
+        }
+
+        // add textures, if given
+        if (!effect.mTexAmbient.mName.empty()) {
+            // It is merely a light-map
+            AddTexture(mat, pParser, effect, effect.mTexAmbient, aiTextureType_LIGHTMAP);
+        }
+
+        if (!effect.mTexEmissive.mName.empty())
+            AddTexture(mat, pParser, effect, effect.mTexEmissive, aiTextureType_EMISSIVE);
+
+        if (!effect.mTexSpecular.mName.empty())
+            AddTexture(mat, pParser, effect, effect.mTexSpecular, aiTextureType_SPECULAR);
+
+        if (!effect.mTexDiffuse.mName.empty())
+            AddTexture(mat, pParser, effect, effect.mTexDiffuse, aiTextureType_DIFFUSE);
+
+        if (!effect.mTexBump.mName.empty())
+            AddTexture(mat, pParser, effect, effect.mTexBump, aiTextureType_NORMALS);
+
+        if (!effect.mTexTransparent.mName.empty())
+            AddTexture(mat, pParser, effect, effect.mTexTransparent, aiTextureType_OPACITY);
+
+        if (!effect.mTexReflective.mName.empty())
+            AddTexture(mat, pParser, effect, effect.mTexReflective, aiTextureType_REFLECTION);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Constructs materials from the collada material definitions
+void ColladaLoader::BuildMaterials(ColladaParser &pParser, aiScene * /*pScene*/) {
+    newMats.reserve(pParser.mMaterialLibrary.size());
+
+    for (ColladaParser::MaterialLibrary::const_iterator matIt = pParser.mMaterialLibrary.begin();
+            matIt != pParser.mMaterialLibrary.end(); ++matIt) {
+        const Material &material = matIt->second;
+        // a material is only a reference to an effect
+        ColladaParser::EffectLibrary::iterator effIt = pParser.mEffectLibrary.find(material.mEffect);
+        if (effIt == pParser.mEffectLibrary.end())
+            continue;
+        Effect &effect = effIt->second;
+
+        // create material
+        aiMaterial *mat = new aiMaterial;
+        aiString name(material.mName.empty() ? matIt->first : material.mName);
+        mat->AddProperty(&name, AI_MATKEY_NAME);
+
+        // store the material
+        mMaterialIndexByName[matIt->first] = newMats.size();
+        newMats.emplace_back(&effect, mat);
+    }
+    // ScenePreprocessor generates a default material automatically if none is there.
+    // All further code here in this loader works well without a valid material so
+    // we can safely let it to ScenePreprocessor.
+}
+
+// ------------------------------------------------------------------------------------------------
+// Resolves the texture name for the given effect texture entry and loads the texture data
+aiString ColladaLoader::FindFilenameForEffectTexture(const ColladaParser &pParser,
+        const Effect &pEffect, const std::string &pName) {
+    aiString result;
+
+    // recurse through the param references until we end up at an image
+    std::string name = pName;
+    while (1) {
+        // the given string is a param entry. Find it
+        Effect::ParamLibrary::const_iterator it = pEffect.mParams.find(name);
+        // if not found, we're at the end of the recursion. The resulting string should be the image ID
+        if (it == pEffect.mParams.end())
+            break;
+
+        // else recurse on
+        name = it->second.mReference;
+    }
+
+    // find the image referred by this name in the image library of the scene
+    ColladaParser::ImageLibrary::const_iterator imIt = pParser.mImageLibrary.find(name);
+    if (imIt == pParser.mImageLibrary.end()) {
+        ASSIMP_LOG_WARN("Collada: Unable to resolve effect texture entry \"", pName, "\", ended up at ID \"", name, "\".");
+
+        //set default texture file name
+        result.Set(name + ".jpg");
+        ColladaParser::UriDecodePath(result);
+        return result;
+    }
+
+    // if this is an embedded texture image setup an aiTexture for it
+    if (!imIt->second.mImageData.empty()) {
+        aiTexture *tex = new aiTexture();
+
+        // Store embedded texture name reference
+        tex->mFilename.Set(imIt->second.mFileName.c_str());
+        result.Set(imIt->second.mFileName);
+
+        // setup format hint
+        if (imIt->second.mEmbeddedFormat.length() >= HINTMAXTEXTURELEN) {
+            ASSIMP_LOG_WARN("Collada: texture format hint is too long, truncating to 3 characters");
+        }
+        strncpy(tex->achFormatHint, imIt->second.mEmbeddedFormat.c_str(), 3);
+
+        // and copy texture data
+        tex->mHeight = 0;
+        tex->mWidth = static_cast<unsigned int>(imIt->second.mImageData.size());
+        tex->pcData = (aiTexel *)new char[tex->mWidth];
+        memcpy(tex->pcData, &imIt->second.mImageData[0], tex->mWidth);
+
+        // and add this texture to the list
+        mTextures.push_back(tex);
+        return result;
+    }
+
+    if (imIt->second.mFileName.empty()) {
+        throw DeadlyImportError("Collada: Invalid texture, no data or file reference given");
+    }
+
+    result.Set(imIt->second.mFileName);
+
+    return result;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Reads a float value from an accessor and its data array.
+ai_real ColladaLoader::ReadFloat(const Accessor &pAccessor, const Data &pData, size_t pIndex, size_t pOffset) const {
+    size_t pos = pAccessor.mStride * pIndex + pAccessor.mOffset + pOffset;
+    ai_assert(pos < pData.mValues.size());
+    return pData.mValues[pos];
+}
+
+// ------------------------------------------------------------------------------------------------
+// Reads a string value from an accessor and its data array.
+const std::string &ColladaLoader::ReadString(const Accessor &pAccessor, const Data &pData, size_t pIndex) const {
+    size_t pos = pAccessor.mStride * pIndex + pAccessor.mOffset;
+    ai_assert(pos < pData.mStrings.size());
+    return pData.mStrings[pos];
+}
+
+// ------------------------------------------------------------------------------------------------
+// Collects all nodes into the given array
+void ColladaLoader::CollectNodes(const aiNode *pNode, std::vector<const aiNode *> &poNodes) const {
+    poNodes.push_back(pNode);
+    for (size_t a = 0; a < pNode->mNumChildren; ++a) {
+        CollectNodes(pNode->mChildren[a], poNodes);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Finds a node in the collada scene by the given name
+const Node *ColladaLoader::FindNode(const Node *pNode, const std::string &pName) const {
+    if (pNode->mName == pName || pNode->mID == pName)
+        return pNode;
+
+    for (auto a : pNode->mChildren) {
+        const Collada::Node *node = FindNode(a, pName);
+        if (node) {
+            return node;
+        }
+    }
+
+    return nullptr;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Finds a node in the collada scene by the given SID
+const Node *ColladaLoader::FindNodeBySID(const Node *pNode, const std::string &pSID) const {
+    if (nullptr == pNode) {
+        return nullptr;
+    }
+
+    if (pNode->mSID == pSID) {
+        return pNode;
+    }
+
+    for (auto a : pNode->mChildren) {
+        const Collada::Node *node = FindNodeBySID(a, pSID);
+        if (node) {
+            return node;
+        }
+    }
+
+    return nullptr;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Finds a proper unique name for a node derived from the collada-node's properties.
+// The name must be unique for proper node-bone association.
+std::string ColladaLoader::FindNameForNode(const Node *pNode) {
+    // If explicitly requested, just use the collada name.
+    if (useColladaName) {
+        if (!pNode->mName.empty()) {
+            return pNode->mName;
+        } else {
+            return format() << "$ColladaAutoName$_" << mNodeNameCounter++;
+        }
+    } else {
+        // Now setup the name of the assimp node. The collada name might not be
+        // unique, so we use the collada ID.
+        if (!pNode->mID.empty())
+            return pNode->mID;
+        else if (!pNode->mSID.empty())
+            return pNode->mSID;
+        else {
+            // No need to worry. Unnamed nodes are no problem at all, except
+            // if cameras or lights need to be assigned to them.
+            return format() << "$ColladaAutoName$_" << mNodeNameCounter++;
+        }
+    }
+}
+
+} // Namespace Assimp
+
+#endif // !! ASSIMP_BUILD_NO_DAE_IMPORTER