add assimp submodule

1 files changed, 1340 insertions, 0 deletions

diff --git a/src/mesh/assimp-master/code/AssetLib/Blender/BlenderLoader.cpp b/src/mesh/assimp-master/code/AssetLib/Blender/BlenderLoader.cpp
new file mode 100644
index 0000000..b3591b4
--- /dev/null
+++ b/src/mesh/assimp-master/code/AssetLib/Blender/BlenderLoader.cpp
@@ -0,0 +1,1340 @@
+
+/*
+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  BlenderLoader.cpp
+ *  @brief Implementation of the Blender3D importer class.
+ */
+
+//#define ASSIMP_BUILD_NO_COMPRESSED_BLEND
+// Uncomment this to disable support for (gzip)compressed .BLEND files
+
+#ifndef ASSIMP_BUILD_NO_BLEND_IMPORTER
+
+#include "BlenderBMesh.h"
+#include "BlenderCustomData.h"
+#include "BlenderIntermediate.h"
+#include "BlenderModifier.h"
+#include <assimp/StringUtils.h>
+#include <assimp/importerdesc.h>
+#include <assimp/scene.h>
+
+#include <assimp/MemoryIOWrapper.h>
+#include <assimp/StreamReader.h>
+#include <assimp/StringComparison.h>
+
+#include <cctype>
+
+// zlib is needed for compressed blend files
+#ifndef ASSIMP_BUILD_NO_COMPRESSED_BLEND
+#include "Common/Compression.h"
+/* #ifdef ASSIMP_BUILD_NO_OWN_ZLIB
+#    include <zlib.h>
+#  else
+#    include "../contrib/zlib/zlib.h"
+#  endif*/
+#endif
+
+namespace Assimp {
+
+template <>
+const char *LogFunctions<BlenderImporter>::Prefix() {
+    static auto prefix = "BLEND: ";
+    return prefix;
+}
+
+} // namespace Assimp
+
+using namespace Assimp;
+using namespace Assimp::Blender;
+using namespace Assimp::Formatter;
+
+static const aiImporterDesc blenderDesc = {
+    "Blender 3D Importer (http://www.blender3d.org)",
+    "",
+    "",
+    "No animation support yet",
+    aiImporterFlags_SupportBinaryFlavour,
+    0,
+    0,
+    2,
+    50,
+    "blend"
+};
+
+// ------------------------------------------------------------------------------------------------
+// Constructor to be privately used by Importer
+BlenderImporter::BlenderImporter() :
+        modifier_cache(new BlenderModifierShowcase()) {
+    // empty
+}
+
+// ------------------------------------------------------------------------------------------------
+// Destructor, private as well
+BlenderImporter::~BlenderImporter() {
+    delete modifier_cache;
+}
+
+static const char * const Tokens[] = { "BLENDER" };
+
+// ------------------------------------------------------------------------------------------------
+// Returns whether the class can handle the format of the given file.
+bool BlenderImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /*checkSig*/) const {
+    // note: this won't catch compressed files
+    static const char *tokens[] = { "<BLENDER", "blender" };
+
+    return SearchFileHeaderForToken(pIOHandler, pFile, tokens, AI_COUNT_OF(tokens));
+}
+
+// ------------------------------------------------------------------------------------------------
+// Loader registry entry
+const aiImporterDesc *BlenderImporter::GetInfo() const {
+    return &blenderDesc;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Setup configuration properties for the loader
+void BlenderImporter::SetupProperties(const Importer * /*pImp*/) {
+    // nothing to be done for the moment
+}
+
+// ------------------------------------------------------------------------------------------------
+// Imports the given file into the given scene structure.
+void BlenderImporter::InternReadFile(const std::string &pFile,
+        aiScene *pScene, IOSystem *pIOHandler) {
+#ifndef ASSIMP_BUILD_NO_COMPRESSED_BLEND
+    std::vector<char> uncompressed;
+#endif
+
+    FileDatabase file;
+    std::shared_ptr<IOStream> stream(pIOHandler->Open(pFile, "rb"));
+    if (!stream) {
+        ThrowException("Could not open file for reading");
+    }
+
+    char magic[8] = { 0 };
+    stream->Read(magic, 7, 1);
+    if (strcmp(magic, Tokens[0])) {
+        // Check for presence of the gzip header. If yes, assume it is a
+        // compressed blend file and try uncompressing it, else fail. This is to
+        // avoid uncompressing random files which our loader might end up with.
+#ifdef ASSIMP_BUILD_NO_COMPRESSED_BLEND
+        ThrowException("BLENDER magic bytes are missing, is this file compressed (Assimp was built without decompression support)?");
+#else
+        if (magic[0] != 0x1f || static_cast<uint8_t>(magic[1]) != 0x8b) {
+            ThrowException("BLENDER magic bytes are missing, couldn't find GZIP header either");
+        }
+
+        LogDebug("Found no BLENDER magic word but a GZIP header, might be a compressed file");
+        if (magic[2] != 8) {
+            ThrowException("Unsupported GZIP compression method");
+        }
+
+        // http://www.gzip.org/zlib/rfc-gzip.html#header-trailer
+        stream->Seek(0L, aiOrigin_SET);
+        std::shared_ptr<StreamReaderLE> reader = std::shared_ptr<StreamReaderLE>(new StreamReaderLE(stream));
+
+        size_t total = 0;
+        Compression compression;
+        if (compression.open(Compression::Format::Binary, Compression::FlushMode::NoFlush, 16 + Compression::MaxWBits)) {
+            total = compression.decompress((unsigned char *)reader->GetPtr(), reader->GetRemainingSize(), uncompressed);
+            compression.close();
+        }
+
+        // replace the input stream with a memory stream
+        stream.reset(new MemoryIOStream(reinterpret_cast<uint8_t *>(uncompressed.data()), total));
+
+        // .. and retry
+        stream->Read(magic, 7, 1);
+        if (strcmp(magic, "BLENDER")) {
+            ThrowException("Found no BLENDER magic word in decompressed GZIP file");
+        }
+#endif
+    }
+
+    file.i64bit = (stream->Read(magic, 1, 1), magic[0] == '-');
+    file.little = (stream->Read(magic, 1, 1), magic[0] == 'v');
+
+    stream->Read(magic, 3, 1);
+    magic[3] = '\0';
+
+    LogInfo("Blender version is ", magic[0], ".", magic + 1,
+            " (64bit: ", file.i64bit ? "true" : "false",
+            ", little endian: ", file.little ? "true" : "false", ")");
+
+    ParseBlendFile(file, stream);
+
+    Scene scene;
+    ExtractScene(scene, file);
+
+    ConvertBlendFile(pScene, scene, file);
+}
+
+// ------------------------------------------------------------------------------------------------
+void BlenderImporter::ParseBlendFile(FileDatabase &out, std::shared_ptr<IOStream> stream) {
+    out.reader = std::make_shared<StreamReaderAny>(stream, out.little);
+
+    DNAParser dna_reader(out);
+    const DNA *dna = nullptr;
+
+    out.entries.reserve(128);
+    { // even small BLEND files tend to consist of many file blocks
+        SectionParser parser(*out.reader.get(), out.i64bit);
+
+        // first parse the file in search for the DNA and insert all other sections into the database
+        while ((parser.Next(), 1)) {
+            const FileBlockHead &head = parser.GetCurrent();
+
+            if (head.id == "ENDB") {
+                break; // only valid end of the file
+            } else if (head.id == "DNA1") {
+                dna_reader.Parse();
+                dna = &dna_reader.GetDNA();
+                continue;
+            }
+
+            out.entries.push_back(head);
+        }
+    }
+    if (!dna) {
+        ThrowException("SDNA not found");
+    }
+
+    std::sort(out.entries.begin(), out.entries.end());
+}
+
+// ------------------------------------------------------------------------------------------------
+void BlenderImporter::ExtractScene(Scene &out, const FileDatabase &file) {
+    const FileBlockHead *block = nullptr;
+    std::map<std::string, size_t>::const_iterator it = file.dna.indices.find("Scene");
+    if (it == file.dna.indices.end()) {
+        ThrowException("There is no `Scene` structure record");
+    }
+
+    const Structure &ss = file.dna.structures[(*it).second];
+
+    // we need a scene somewhere to start with.
+    for (const FileBlockHead &bl : file.entries) {
+
+        // Fix: using the DNA index is more reliable to locate scenes
+        //if (bl.id == "SC") {
+
+        if (bl.dna_index == (*it).second) {
+            block = &bl;
+            break;
+        }
+    }
+
+    if (!block) {
+        ThrowException("There is not a single `Scene` record to load");
+    }
+
+    file.reader->SetCurrentPos(block->start);
+    ss.Convert(out, file);
+
+#ifndef ASSIMP_BUILD_BLENDER_NO_STATS
+    ASSIMP_LOG_INFO(
+            "(Stats) Fields read: ", file.stats().fields_read,
+            ", pointers resolved: ", file.stats().pointers_resolved,
+            ", cache hits: ", file.stats().cache_hits,
+            ", cached objects: ", file.stats().cached_objects);
+#endif
+}
+
+// ------------------------------------------------------------------------------------------------
+void BlenderImporter::ParseSubCollection(const Blender::Scene &in, aiNode *root, std::shared_ptr<Collection> collection, ConversionData &conv_data) {
+
+    std::deque<Object *> root_objects;
+    // Count number of objects
+    for (std::shared_ptr<CollectionObject> cur = std::static_pointer_cast<CollectionObject>(collection->gobject.first); cur; cur = cur->next) {
+        if (cur->ob) {
+            root_objects.push_back(cur->ob);
+        }
+    }
+    std::deque<Collection *> root_children;
+    // Count number of child nodes
+    for (std::shared_ptr<CollectionChild> cur = std::static_pointer_cast<CollectionChild>(collection->children.first); cur; cur = cur->next) {
+        if (cur->collection) {
+            root_children.push_back(cur->collection.get());
+        }
+    }
+    root->mNumChildren = static_cast<unsigned int>(root_objects.size() + root_children.size());
+    root->mChildren = new aiNode *[root->mNumChildren]();
+
+    for (unsigned int i = 0; i < static_cast<unsigned int>(root_objects.size()); ++i) {
+        root->mChildren[i] = ConvertNode(in, root_objects[i], conv_data, aiMatrix4x4());
+        root->mChildren[i]->mParent = root;
+    }
+
+    // For each subcollection create a new node to represent it
+    unsigned int iterator = static_cast<unsigned int>(root_objects.size());
+    for (std::shared_ptr<CollectionChild> cur = std::static_pointer_cast<CollectionChild>(collection->children.first); cur; cur = cur->next) {
+        if (cur->collection) {
+            root->mChildren[iterator] = new aiNode(cur->collection->id.name + 2); // skip over the name prefix 'OB'
+            root->mChildren[iterator]->mParent = root;
+            ParseSubCollection(in, root->mChildren[iterator], cur->collection, conv_data);
+        }
+        iterator += 1;
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void BlenderImporter::ConvertBlendFile(aiScene *out, const Scene &in, const FileDatabase &file) {
+    ConversionData conv(file);
+
+    aiNode *root = out->mRootNode = new aiNode("<BlenderRoot>");
+    // Iterate over all objects directly under master_collection,
+    // If in.master_collection == null, then we're parsing something older.
+    if (in.master_collection) {
+        ParseSubCollection(in, root, in.master_collection, conv);
+    } else {
+        std::deque<const Object *> no_parents;
+        for (std::shared_ptr<Base> cur = std::static_pointer_cast<Base>(in.base.first); cur; cur = cur->next) {
+            if (cur->object) {
+                if (!cur->object->parent) {
+                    no_parents.push_back(cur->object.get());
+                } else {
+                    conv.objects.insert(cur->object.get());
+                }
+            }
+        }
+        for (std::shared_ptr<Base> cur = in.basact; cur; cur = cur->next) {
+            if (cur->object) {
+                if (cur->object->parent) {
+                    conv.objects.insert(cur->object.get());
+                }
+            }
+        }
+
+        if (no_parents.empty()) {
+            ThrowException("Expected at least one object with no parent");
+        }
+
+        root->mNumChildren = static_cast<unsigned int>(no_parents.size());
+        root->mChildren = new aiNode *[root->mNumChildren]();
+        for (unsigned int i = 0; i < root->mNumChildren; ++i) {
+            root->mChildren[i] = ConvertNode(in, no_parents[i], conv, aiMatrix4x4());
+            root->mChildren[i]->mParent = root;
+        }
+    }
+
+    BuildMaterials(conv);
+
+    if (conv.meshes->size()) {
+        out->mMeshes = new aiMesh *[out->mNumMeshes = static_cast<unsigned int>(conv.meshes->size())];
+        std::copy(conv.meshes->begin(), conv.meshes->end(), out->mMeshes);
+        conv.meshes.dismiss();
+    }
+
+    if (conv.lights->size()) {
+        out->mLights = new aiLight *[out->mNumLights = static_cast<unsigned int>(conv.lights->size())];
+        std::copy(conv.lights->begin(), conv.lights->end(), out->mLights);
+        conv.lights.dismiss();
+    }
+
+    if (conv.cameras->size()) {
+        out->mCameras = new aiCamera *[out->mNumCameras = static_cast<unsigned int>(conv.cameras->size())];
+        std::copy(conv.cameras->begin(), conv.cameras->end(), out->mCameras);
+        conv.cameras.dismiss();
+    }
+
+    if (conv.materials->size()) {
+        out->mMaterials = new aiMaterial *[out->mNumMaterials = static_cast<unsigned int>(conv.materials->size())];
+        std::copy(conv.materials->begin(), conv.materials->end(), out->mMaterials);
+        conv.materials.dismiss();
+    }
+
+    if (conv.textures->size()) {
+        out->mTextures = new aiTexture *[out->mNumTextures = static_cast<unsigned int>(conv.textures->size())];
+        std::copy(conv.textures->begin(), conv.textures->end(), out->mTextures);
+        conv.textures.dismiss();
+    }
+
+    // acknowledge that the scene might come out incomplete
+    // by Assimp's definition of `complete`: blender scenes
+    // can consist of thousands of cameras or lights with
+    // not a single mesh between them.
+    if (!out->mNumMeshes) {
+        out->mFlags |= AI_SCENE_FLAGS_INCOMPLETE;
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void BlenderImporter::ResolveImage(aiMaterial *out, const Material *mat, const MTex *tex, const Image *img, ConversionData &conv_data) {
+    (void)mat;
+    (void)tex;
+    (void)conv_data;
+    aiString name;
+
+    // check if the file contents are bundled with the BLEND file
+    if (img->packedfile) {
+        name.data[0] = '*';
+        name.length = 1 + ASSIMP_itoa10(name.data + 1, static_cast<unsigned int>(MAXLEN - 1), static_cast<int32_t>(conv_data.textures->size()));
+
+        conv_data.textures->push_back(new aiTexture());
+        aiTexture *curTex = conv_data.textures->back();
+
+        // usually 'img->name' will be the original file name of the embedded textures,
+        // so we can extract the file extension from it.
+        const size_t nlen = strlen(img->name);
+        const char *s = img->name + nlen, *e = s;
+        while (s >= img->name && *s != '.') {
+            --s;
+        }
+
+        curTex->achFormatHint[0] = s + 1 > e ? '\0' : (char)::tolower((unsigned char)s[1]);
+        curTex->achFormatHint[1] = s + 2 > e ? '\0' : (char)::tolower((unsigned char)s[2]);
+        curTex->achFormatHint[2] = s + 3 > e ? '\0' : (char)::tolower((unsigned char)s[3]);
+        curTex->achFormatHint[3] = '\0';
+
+        // tex->mHeight = 0;
+        curTex->mWidth = img->packedfile->size;
+        uint8_t *ch = new uint8_t[curTex->mWidth];
+
+        conv_data.db.reader->SetCurrentPos(static_cast<size_t>(img->packedfile->data->val));
+        conv_data.db.reader->CopyAndAdvance(ch, curTex->mWidth);
+
+        curTex->pcData = reinterpret_cast<aiTexel *>(ch);
+
+        LogInfo("Reading embedded texture, original file was ", img->name);
+    } else {
+        name = aiString(img->name);
+    }
+
+    aiTextureType texture_type = aiTextureType_UNKNOWN;
+    MTex::MapType map_type = tex->mapto;
+
+    if (map_type & MTex::MapType_COL)
+        texture_type = aiTextureType_DIFFUSE;
+    else if (map_type & MTex::MapType_NORM) {
+        if (tex->tex->imaflag & Tex::ImageFlags_NORMALMAP) {
+            texture_type = aiTextureType_NORMALS;
+        } else {
+            texture_type = aiTextureType_HEIGHT;
+        }
+        out->AddProperty(&tex->norfac, 1, AI_MATKEY_BUMPSCALING);
+    } else if (map_type & MTex::MapType_COLSPEC)
+        texture_type = aiTextureType_SPECULAR;
+    else if (map_type & MTex::MapType_COLMIR)
+        texture_type = aiTextureType_REFLECTION;
+    //else if (map_type & MTex::MapType_REF)
+    else if (map_type & MTex::MapType_SPEC)
+        texture_type = aiTextureType_SHININESS;
+    else if (map_type & MTex::MapType_EMIT)
+        texture_type = aiTextureType_EMISSIVE;
+    //else if (map_type & MTex::MapType_ALPHA)
+    //else if (map_type & MTex::MapType_HAR)
+    //else if (map_type & MTex::MapType_RAYMIRR)
+    //else if (map_type & MTex::MapType_TRANSLU)
+    else if (map_type & MTex::MapType_AMB)
+        texture_type = aiTextureType_AMBIENT;
+    else if (map_type & MTex::MapType_DISPLACE)
+        texture_type = aiTextureType_DISPLACEMENT;
+    //else if (map_type & MTex::MapType_WARP)
+
+    out->AddProperty(&name, AI_MATKEY_TEXTURE(texture_type,
+                                    conv_data.next_texture[texture_type]++));
+}
+
+// ------------------------------------------------------------------------------------------------
+void BlenderImporter::AddSentinelTexture(aiMaterial *out, const Material *mat, const MTex *tex, ConversionData &conv_data) {
+    (void)mat;
+    (void)tex;
+    (void)conv_data;
+
+    aiString name;
+    name.length = ai_snprintf(name.data, MAXLEN, "Procedural,num=%i,type=%s", conv_data.sentinel_cnt++,
+            GetTextureTypeDisplayString(tex->tex->type));
+    out->AddProperty(&name, AI_MATKEY_TEXTURE_DIFFUSE(
+                                    conv_data.next_texture[aiTextureType_DIFFUSE]++));
+}
+
+// ------------------------------------------------------------------------------------------------
+void BlenderImporter::ResolveTexture(aiMaterial *out, const Material *mat, const MTex *tex, ConversionData &conv_data) {
+    const Tex *rtex = tex->tex.get();
+    if (!rtex || !rtex->type) {
+        return;
+    }
+
+    // We can't support most of the texture types because they're mostly procedural.
+    // These are substituted by a dummy texture.
+    const char *dispnam = "";
+    switch (rtex->type) {
+        // these are listed in blender's UI
+    case Tex::Type_CLOUDS:
+    case Tex::Type_WOOD:
+    case Tex::Type_MARBLE:
+    case Tex::Type_MAGIC:
+    case Tex::Type_BLEND:
+    case Tex::Type_STUCCI:
+    case Tex::Type_NOISE:
+    case Tex::Type_PLUGIN:
+    case Tex::Type_MUSGRAVE:
+    case Tex::Type_VORONOI:
+    case Tex::Type_DISTNOISE:
+    case Tex::Type_ENVMAP:
+
+        // these do no appear in the UI, why?
+    case Tex::Type_POINTDENSITY:
+    case Tex::Type_VOXELDATA:
+
+        LogWarn("Encountered a texture with an unsupported type: ", dispnam);
+        AddSentinelTexture(out, mat, tex, conv_data);
+        break;
+
+    case Tex::Type_IMAGE:
+        if (!rtex->ima) {
+            LogError("A texture claims to be an Image, but no image reference is given");
+            break;
+        }
+        ResolveImage(out, mat, tex, rtex->ima.get(), conv_data);
+        break;
+
+    default:
+        ai_assert(false);
+    };
+}
+
+// ------------------------------------------------------------------------------------------------
+void BlenderImporter::BuildDefaultMaterial(Blender::ConversionData &conv_data) {
+    // add a default material if necessary
+    unsigned int index = static_cast<unsigned int>(-1);
+    for (aiMesh *mesh : conv_data.meshes.get()) {
+        if (mesh->mMaterialIndex == static_cast<unsigned int>(-1)) {
+
+            if (index == static_cast<unsigned int>(-1)) {
+                // Setup a default material.
+                std::shared_ptr<Material> p(new Material());
+                ai_assert(::strlen(AI_DEFAULT_MATERIAL_NAME) < sizeof(p->id.name) - 2);
+                strcpy(p->id.name + 2, AI_DEFAULT_MATERIAL_NAME);
+
+                // Note: MSVC11 does not zero-initialize Material here, although it should.
+                // Thus all relevant fields should be explicitly initialized. We cannot add
+                // a default constructor to Material since the DNA codegen does not support
+                // parsing it.
+                p->r = p->g = p->b = 0.6f;
+                p->specr = p->specg = p->specb = 0.6f;
+                p->ambr = p->ambg = p->ambb = 0.0f;
+                p->mirr = p->mirg = p->mirb = 0.0f;
+                p->emit = 0.f;
+                p->alpha = 0.f;
+                p->har = 0;
+
+                index = static_cast<unsigned int>(conv_data.materials_raw.size());
+                conv_data.materials_raw.push_back(p);
+                LogInfo("Adding default material");
+            }
+            mesh->mMaterialIndex = index;
+        }
+    }
+}
+
+void BlenderImporter::AddBlendParams(aiMaterial *result, const Material *source) {
+    aiColor3D diffuseColor(source->r, source->g, source->b);
+    result->AddProperty(&diffuseColor, 1, "$mat.blend.diffuse.color", 0, 0);
+
+    float diffuseIntensity = source->ref;
+    result->AddProperty(&diffuseIntensity, 1, "$mat.blend.diffuse.intensity", 0, 0);
+
+    int diffuseShader = source->diff_shader;
+    result->AddProperty(&diffuseShader, 1, "$mat.blend.diffuse.shader", 0, 0);
+
+    int diffuseRamp = 0;
+    result->AddProperty(&diffuseRamp, 1, "$mat.blend.diffuse.ramp", 0, 0);
+
+    aiColor3D specularColor(source->specr, source->specg, source->specb);
+    result->AddProperty(&specularColor, 1, "$mat.blend.specular.color", 0, 0);
+
+    float specularIntensity = source->spec;
+    result->AddProperty(&specularIntensity, 1, "$mat.blend.specular.intensity", 0, 0);
+
+    int specularShader = source->spec_shader;
+    result->AddProperty(&specularShader, 1, "$mat.blend.specular.shader", 0, 0);
+
+    int specularRamp = 0;
+    result->AddProperty(&specularRamp, 1, "$mat.blend.specular.ramp", 0, 0);
+
+    int specularHardness = source->har;
+    result->AddProperty(&specularHardness, 1, "$mat.blend.specular.hardness", 0, 0);
+
+    int transparencyUse = source->mode & MA_TRANSPARENCY ? 1 : 0;
+    result->AddProperty(&transparencyUse, 1, "$mat.blend.transparency.use", 0, 0);
+
+    int transparencyMethod = source->mode & MA_RAYTRANSP ? 2 : (source->mode & MA_ZTRANSP ? 1 : 0);
+    result->AddProperty(&transparencyMethod, 1, "$mat.blend.transparency.method", 0, 0);
+
+    float transparencyAlpha = source->alpha;
+    result->AddProperty(&transparencyAlpha, 1, "$mat.blend.transparency.alpha", 0, 0);
+
+    float transparencySpecular = source->spectra;
+    result->AddProperty(&transparencySpecular, 1, "$mat.blend.transparency.specular", 0, 0);
+
+    float transparencyFresnel = source->fresnel_tra;
+    result->AddProperty(&transparencyFresnel, 1, "$mat.blend.transparency.fresnel", 0, 0);
+
+    float transparencyBlend = source->fresnel_tra_i;
+    result->AddProperty(&transparencyBlend, 1, "$mat.blend.transparency.blend", 0, 0);
+
+    float transparencyIor = source->ang;
+    result->AddProperty(&transparencyIor, 1, "$mat.blend.transparency.ior", 0, 0);
+
+    float transparencyFilter = source->filter;
+    result->AddProperty(&transparencyFilter, 1, "$mat.blend.transparency.filter", 0, 0);
+
+    float transparencyFalloff = source->tx_falloff;
+    result->AddProperty(&transparencyFalloff, 1, "$mat.blend.transparency.falloff", 0, 0);
+
+    float transparencyLimit = source->tx_limit;
+    result->AddProperty(&transparencyLimit, 1, "$mat.blend.transparency.limit", 0, 0);
+
+    int transparencyDepth = source->ray_depth_tra;
+    result->AddProperty(&transparencyDepth, 1, "$mat.blend.transparency.depth", 0, 0);
+
+    float transparencyGlossAmount = source->gloss_tra;
+    result->AddProperty(&transparencyGlossAmount, 1, "$mat.blend.transparency.glossAmount", 0, 0);
+
+    float transparencyGlossThreshold = source->adapt_thresh_tra;
+    result->AddProperty(&transparencyGlossThreshold, 1, "$mat.blend.transparency.glossThreshold", 0, 0);
+
+    int transparencyGlossSamples = source->samp_gloss_tra;
+    result->AddProperty(&transparencyGlossSamples, 1, "$mat.blend.transparency.glossSamples", 0, 0);
+
+    int mirrorUse = source->mode & MA_RAYMIRROR ? 1 : 0;
+    result->AddProperty(&mirrorUse, 1, "$mat.blend.mirror.use", 0, 0);
+
+    float mirrorReflectivity = source->ray_mirror;
+    result->AddProperty(&mirrorReflectivity, 1, "$mat.blend.mirror.reflectivity", 0, 0);
+
+    aiColor3D mirrorColor(source->mirr, source->mirg, source->mirb);
+    result->AddProperty(&mirrorColor, 1, "$mat.blend.mirror.color", 0, 0);
+
+    float mirrorFresnel = source->fresnel_mir;
+    result->AddProperty(&mirrorFresnel, 1, "$mat.blend.mirror.fresnel", 0, 0);
+
+    float mirrorBlend = source->fresnel_mir_i;
+    result->AddProperty(&mirrorBlend, 1, "$mat.blend.mirror.blend", 0, 0);
+
+    int mirrorDepth = source->ray_depth;
+    result->AddProperty(&mirrorDepth, 1, "$mat.blend.mirror.depth", 0, 0);
+
+    float mirrorMaxDist = source->dist_mir;
+    result->AddProperty(&mirrorMaxDist, 1, "$mat.blend.mirror.maxDist", 0, 0);
+
+    int mirrorFadeTo = source->fadeto_mir;
+    result->AddProperty(&mirrorFadeTo, 1, "$mat.blend.mirror.fadeTo", 0, 0);
+
+    float mirrorGlossAmount = source->gloss_mir;
+    result->AddProperty(&mirrorGlossAmount, 1, "$mat.blend.mirror.glossAmount", 0, 0);
+
+    float mirrorGlossThreshold = source->adapt_thresh_mir;
+    result->AddProperty(&mirrorGlossThreshold, 1, "$mat.blend.mirror.glossThreshold", 0, 0);
+
+    int mirrorGlossSamples = source->samp_gloss_mir;
+    result->AddProperty(&mirrorGlossSamples, 1, "$mat.blend.mirror.glossSamples", 0, 0);
+
+    float mirrorGlossAnisotropic = source->aniso_gloss_mir;
+    result->AddProperty(&mirrorGlossAnisotropic, 1, "$mat.blend.mirror.glossAnisotropic", 0, 0);
+}
+
+void BlenderImporter::BuildMaterials(ConversionData &conv_data) {
+    conv_data.materials->reserve(conv_data.materials_raw.size());
+
+    BuildDefaultMaterial(conv_data);
+
+    for (const std::shared_ptr<Material> &mat : conv_data.materials_raw) {
+
+        // reset per material global counters
+        for (size_t i = 0; i < sizeof(conv_data.next_texture) / sizeof(conv_data.next_texture[0]); ++i) {
+            conv_data.next_texture[i] = 0;
+        }
+
+        aiMaterial *mout = new aiMaterial();
+        conv_data.materials->push_back(mout);
+        // For any new material field handled here, the default material above must be updated with an appropriate default value.
+
+        // set material name
+        aiString name = aiString(mat->id.name + 2); // skip over the name prefix 'MA'
+        mout->AddProperty(&name, AI_MATKEY_NAME);
+
+        // basic material colors
+        aiColor3D col(mat->r, mat->g, mat->b);
+        if (mat->r || mat->g || mat->b) {
+
+            // Usually, zero diffuse color means no diffuse color at all in the equation.
+            // So we omit this member to express this intent.
+            mout->AddProperty(&col, 1, AI_MATKEY_COLOR_DIFFUSE);
+
+            if (mat->emit) {
+                aiColor3D emit_col(mat->emit * mat->r, mat->emit * mat->g, mat->emit * mat->b);
+                mout->AddProperty(&emit_col, 1, AI_MATKEY_COLOR_EMISSIVE);
+            }
+        }
+
+        col = aiColor3D(mat->specr, mat->specg, mat->specb);
+        mout->AddProperty(&col, 1, AI_MATKEY_COLOR_SPECULAR);
+
+        // is hardness/shininess set?
+        if (mat->har) {
+            const float har = mat->har;
+            mout->AddProperty(&har, 1, AI_MATKEY_SHININESS);
+        }
+
+        col = aiColor3D(mat->ambr, mat->ambg, mat->ambb);
+        mout->AddProperty(&col, 1, AI_MATKEY_COLOR_AMBIENT);
+
+        // is mirror enabled?
+        if (mat->mode & MA_RAYMIRROR) {
+            const float ray_mirror = mat->ray_mirror;
+            mout->AddProperty(&ray_mirror, 1, AI_MATKEY_REFLECTIVITY);
+        }
+
+        col = aiColor3D(mat->mirr, mat->mirg, mat->mirb);
+        mout->AddProperty(&col, 1, AI_MATKEY_COLOR_REFLECTIVE);
+
+        for (size_t i = 0; i < sizeof(mat->mtex) / sizeof(mat->mtex[0]); ++i) {
+            if (!mat->mtex[i]) {
+                continue;
+            }
+
+            ResolveTexture(mout, mat.get(), mat->mtex[i].get(), conv_data);
+        }
+
+        AddBlendParams(mout, mat.get());
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void BlenderImporter::CheckActualType(const ElemBase *dt, const char *check) {
+    ai_assert(dt);
+    if (strcmp(dt->dna_type, check)) {
+        ThrowException("Expected object at ", std::hex, dt, " to be of type `", check,
+                "`, but it claims to be a `", dt->dna_type, "`instead");
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void BlenderImporter::NotSupportedObjectType(const Object *obj, const char *type) {
+    LogWarn("Object `", obj->id.name, "` - type is unsupported: `", type, "`, skipping");
+}
+
+// ------------------------------------------------------------------------------------------------
+void BlenderImporter::ConvertMesh(const Scene & /*in*/, const Object * /*obj*/, const Mesh *mesh,
+        ConversionData &conv_data, TempArray<std::vector, aiMesh> &temp) {
+    // TODO: Resolve various problems with BMesh triangulation before re-enabling.
+    //       See issues #400, #373, #318  #315 and #132.
+#if defined(TODO_FIX_BMESH_CONVERSION)
+    BlenderBMeshConverter BMeshConverter(mesh);
+    if (BMeshConverter.ContainsBMesh()) {
+        mesh = BMeshConverter.TriangulateBMesh();
+    }
+#endif
+
+    typedef std::pair<const int, size_t> MyPair;
+    if ((!mesh->totface && !mesh->totloop) || !mesh->totvert) {
+        return;
+    }
+
+    // some sanity checks
+    if (static_cast<size_t>(mesh->totface) > mesh->mface.size()) {
+        ThrowException("Number of faces is larger than the corresponding array");
+    }
+
+    if (static_cast<size_t>(mesh->totvert) > mesh->mvert.size()) {
+        ThrowException("Number of vertices is larger than the corresponding array");
+    }
+
+    if (static_cast<size_t>(mesh->totloop) > mesh->mloop.size()) {
+        ThrowException("Number of vertices is larger than the corresponding array");
+    }
+
+    // collect per-submesh numbers
+    std::map<int, size_t> per_mat;
+    std::map<int, size_t> per_mat_verts;
+    for (int i = 0; i < mesh->totface; ++i) {
+
+        const MFace &mf = mesh->mface[i];
+        per_mat[mf.mat_nr]++;
+        per_mat_verts[mf.mat_nr] += mf.v4 ? 4 : 3;
+    }
+
+    for (int i = 0; i < mesh->totpoly; ++i) {
+        const MPoly &mp = mesh->mpoly[i];
+        per_mat[mp.mat_nr]++;
+        per_mat_verts[mp.mat_nr] += mp.totloop;
+    }
+
+    // ... and allocate the corresponding meshes
+    const size_t old = temp->size();
+    temp->reserve(temp->size() + per_mat.size());
+
+    std::map<size_t, size_t> mat_num_to_mesh_idx;
+    for (MyPair &it : per_mat) {
+
+        mat_num_to_mesh_idx[it.first] = temp->size();
+        temp->push_back(new aiMesh());
+
+        aiMesh *out = temp->back();
+        out->mVertices = new aiVector3D[per_mat_verts[it.first]];
+        out->mNormals = new aiVector3D[per_mat_verts[it.first]];
+
+        //out->mNumFaces = 0
+        //out->mNumVertices = 0
+        out->mFaces = new aiFace[it.second]();
+
+        // all sub-meshes created from this mesh are named equally. this allows
+        // curious users to recover the original adjacency.
+        out->mName = aiString(mesh->id.name + 2);
+        // skip over the name prefix 'ME'
+
+        // resolve the material reference and add this material to the set of
+        // output materials. The (temporary) material index is the index
+        // of the material entry within the list of resolved materials.
+        if (mesh->mat) {
+
+            if (static_cast<size_t>(it.first) >= mesh->mat.size()) {
+                ThrowException("Material index is out of range");
+            }
+
+            std::shared_ptr<Material> mat = mesh->mat[it.first];
+            const std::deque<std::shared_ptr<Material>>::iterator has = std::find(
+                    conv_data.materials_raw.begin(),
+                    conv_data.materials_raw.end(), mat);
+
+            if (has != conv_data.materials_raw.end()) {
+                out->mMaterialIndex = static_cast<unsigned int>(std::distance(conv_data.materials_raw.begin(), has));
+            } else {
+                out->mMaterialIndex = static_cast<unsigned int>(conv_data.materials_raw.size());
+                conv_data.materials_raw.push_back(mat);
+            }
+        } else
+            out->mMaterialIndex = static_cast<unsigned int>(-1);
+    }
+
+    for (int i = 0; i < mesh->totface; ++i) {
+
+        const MFace &mf = mesh->mface[i];
+
+        aiMesh *const out = temp[mat_num_to_mesh_idx[mf.mat_nr]];
+        aiFace &f = out->mFaces[out->mNumFaces++];
+
+        f.mIndices = new unsigned int[f.mNumIndices = mf.v4 ? 4 : 3];
+        aiVector3D *vo = out->mVertices + out->mNumVertices;
+        aiVector3D *vn = out->mNormals + out->mNumVertices;
+
+        // XXX we can't fold this easily, because we are restricted
+        // to the member names from the BLEND file (v1,v2,v3,v4)
+        // which are assigned by the genblenddna.py script and
+        // cannot be changed without breaking the entire
+        // import process.
+
+        if (mf.v1 >= mesh->totvert) {
+            ThrowException("Vertex index v1 out of range");
+        }
+        const MVert *v = &mesh->mvert[mf.v1];
+        vo->x = v->co[0];
+        vo->y = v->co[1];
+        vo->z = v->co[2];
+        vn->x = v->no[0];
+        vn->y = v->no[1];
+        vn->z = v->no[2];
+        f.mIndices[0] = out->mNumVertices++;
+        ++vo;
+        ++vn;
+
+        //  if (f.mNumIndices >= 2) {
+        if (mf.v2 >= mesh->totvert) {
+            ThrowException("Vertex index v2 out of range");
+        }
+        v = &mesh->mvert[mf.v2];
+        vo->x = v->co[0];
+        vo->y = v->co[1];
+        vo->z = v->co[2];
+        vn->x = v->no[0];
+        vn->y = v->no[1];
+        vn->z = v->no[2];
+        f.mIndices[1] = out->mNumVertices++;
+        ++vo;
+        ++vn;
+
+        if (mf.v3 >= mesh->totvert) {
+            ThrowException("Vertex index v3 out of range");
+        }
+        //  if (f.mNumIndices >= 3) {
+        v = &mesh->mvert[mf.v3];
+        vo->x = v->co[0];
+        vo->y = v->co[1];
+        vo->z = v->co[2];
+        vn->x = v->no[0];
+        vn->y = v->no[1];
+        vn->z = v->no[2];
+        f.mIndices[2] = out->mNumVertices++;
+        ++vo;
+        ++vn;
+
+        if (mf.v4 >= mesh->totvert) {
+            ThrowException("Vertex index v4 out of range");
+        }
+        //  if (f.mNumIndices >= 4) {
+        if (mf.v4) {
+            v = &mesh->mvert[mf.v4];
+            vo->x = v->co[0];
+            vo->y = v->co[1];
+            vo->z = v->co[2];
+            vn->x = v->no[0];
+            vn->y = v->no[1];
+            vn->z = v->no[2];
+            f.mIndices[3] = out->mNumVertices++;
+            ++vo;
+            ++vn;
+
+            out->mPrimitiveTypes |= aiPrimitiveType_POLYGON;
+        } else
+            out->mPrimitiveTypes |= aiPrimitiveType_TRIANGLE;
+
+        //  }
+        //  }
+        //  }
+    }
+
+    for (int i = 0; i < mesh->totpoly; ++i) {
+
+        const MPoly &mf = mesh->mpoly[i];
+
+        aiMesh *const out = temp[mat_num_to_mesh_idx[mf.mat_nr]];
+        aiFace &f = out->mFaces[out->mNumFaces++];
+
+        f.mIndices = new unsigned int[f.mNumIndices = mf.totloop];
+        aiVector3D *vo = out->mVertices + out->mNumVertices;
+        aiVector3D *vn = out->mNormals + out->mNumVertices;
+
+        // XXX we can't fold this easily, because we are restricted
+        // to the member names from the BLEND file (v1,v2,v3,v4)
+        // which are assigned by the genblenddna.py script and
+        // cannot be changed without breaking the entire
+        // import process.
+        for (int j = 0; j < mf.totloop; ++j) {
+            const MLoop &loop = mesh->mloop[mf.loopstart + j];
+
+            if (loop.v >= mesh->totvert) {
+                ThrowException("Vertex index out of range");
+            }
+
+            const MVert &v = mesh->mvert[loop.v];
+
+            vo->x = v.co[0];
+            vo->y = v.co[1];
+            vo->z = v.co[2];
+            vn->x = v.no[0];
+            vn->y = v.no[1];
+            vn->z = v.no[2];
+            f.mIndices[j] = out->mNumVertices++;
+
+            ++vo;
+            ++vn;
+        }
+        if (mf.totloop == 3) {
+            out->mPrimitiveTypes |= aiPrimitiveType_TRIANGLE;
+        } else {
+            out->mPrimitiveTypes |= aiPrimitiveType_POLYGON;
+        }
+    }
+
+    // TODO should we create the TextureUVMapping map in Convert<Material> to prevent redundant processing?
+
+    // create texture <-> uvname mapping for all materials
+    // key is texture number, value is data *
+    typedef std::map<uint32_t, const MLoopUV *> TextureUVMapping;
+    // key is material number, value is the TextureUVMapping for the material
+    typedef std::map<uint32_t, TextureUVMapping> MaterialTextureUVMappings;
+    MaterialTextureUVMappings matTexUvMappings;
+    const uint32_t maxMat = static_cast<const uint32_t>(mesh->mat.size());
+    for (uint32_t m = 0; m < maxMat; ++m) {
+        // get material by index
+        const std::shared_ptr<Material> pMat = mesh->mat[m];
+        TextureUVMapping texuv;
+        const uint32_t maxTex = sizeof(pMat->mtex) / sizeof(pMat->mtex[0]);
+        for (uint32_t t = 0; t < maxTex; ++t) {
+            if (pMat->mtex[t] && pMat->mtex[t]->uvname[0]) {
+                // get the CustomData layer for given uvname and correct type
+                const ElemBase *pLoop = getCustomDataLayerData(mesh->ldata, CD_MLOOPUV, pMat->mtex[t]->uvname);
+                if (pLoop) {
+                    texuv.insert(std::make_pair(t, dynamic_cast<const MLoopUV *>(pLoop)));
+                }
+            }
+        }
+        if (texuv.size()) {
+            matTexUvMappings.insert(std::make_pair(m, texuv));
+        }
+    }
+
+    // collect texture coordinates, they're stored in a separate per-face buffer
+    if (mesh->mtface || mesh->mloopuv) {
+        if (mesh->totface > static_cast<int>(mesh->mtface.size())) {
+            ThrowException("Number of UV faces is larger than the corresponding UV face array (#1)");
+        }
+        for (std::vector<aiMesh *>::iterator it = temp->begin() + old; it != temp->end(); ++it) {
+            ai_assert(0 != (*it)->mNumVertices);
+            ai_assert(0 != (*it)->mNumFaces);
+            const auto itMatTexUvMapping = matTexUvMappings.find((*it)->mMaterialIndex);
+            if (itMatTexUvMapping == matTexUvMappings.end()) {
+                // default behaviour like before
+                (*it)->mTextureCoords[0] = new aiVector3D[(*it)->mNumVertices];
+            } else {
+                // create texture coords for every mapped tex
+                for (uint32_t i = 0; i < itMatTexUvMapping->second.size(); ++i) {
+                    (*it)->mTextureCoords[i] = new aiVector3D[(*it)->mNumVertices];
+                }
+            }
+            (*it)->mNumFaces = (*it)->mNumVertices = 0;
+        }
+
+        for (int i = 0; i < mesh->totface; ++i) {
+            const MTFace *v = &mesh->mtface[i];
+
+            aiMesh *const out = temp[mat_num_to_mesh_idx[mesh->mface[i].mat_nr]];
+            const aiFace &f = out->mFaces[out->mNumFaces++];
+
+            aiVector3D *vo = &out->mTextureCoords[0][out->mNumVertices];
+            for (unsigned int j = 0; j < f.mNumIndices; ++j, ++vo, ++out->mNumVertices) {
+                vo->x = v->uv[j][0];
+                vo->y = v->uv[j][1];
+            }
+        }
+
+        for (int i = 0; i < mesh->totpoly; ++i) {
+            const MPoly &v = mesh->mpoly[i];
+            aiMesh *const out = temp[mat_num_to_mesh_idx[v.mat_nr]];
+            const aiFace &f = out->mFaces[out->mNumFaces++];
+
+            const auto itMatTexUvMapping = matTexUvMappings.find(v.mat_nr);
+            if (itMatTexUvMapping == matTexUvMappings.end()) {
+                // old behavior
+                aiVector3D *vo = &out->mTextureCoords[0][out->mNumVertices];
+                for (unsigned int j = 0; j < f.mNumIndices; ++j, ++vo, ++out->mNumVertices) {
+                    const MLoopUV &uv = mesh->mloopuv[v.loopstart + j];
+                    vo->x = uv.uv[0];
+                    vo->y = uv.uv[1];
+                }
+            } else {
+                // create textureCoords for every mapped tex
+                for (uint32_t m = 0; m < itMatTexUvMapping->second.size(); ++m) {
+                    const MLoopUV *tm = itMatTexUvMapping->second[m];
+                    aiVector3D *vo = &out->mTextureCoords[m][out->mNumVertices];
+                    uint32_t j = 0;
+                    for (; j < f.mNumIndices; ++j, ++vo) {
+                        const MLoopUV &uv = tm[v.loopstart + j];
+                        vo->x = uv.uv[0];
+                        vo->y = uv.uv[1];
+                    }
+                    // only update written mNumVertices in last loop
+                    // TODO why must the numVertices be incremented here?
+                    if (m == itMatTexUvMapping->second.size() - 1) {
+                        out->mNumVertices += j;
+                    }
+                }
+            }
+        }
+    }
+
+    // collect texture coordinates, old-style (marked as deprecated in current blender sources)
+    if (mesh->tface) {
+        if (mesh->totface > static_cast<int>(mesh->tface.size())) {
+            ThrowException("Number of faces is larger than the corresponding UV face array (#2)");
+        }
+        for (std::vector<aiMesh *>::iterator it = temp->begin() + old; it != temp->end(); ++it) {
+            ai_assert(0 != (*it)->mNumVertices);
+            ai_assert(0 != (*it)->mNumFaces);
+
+            (*it)->mTextureCoords[0] = new aiVector3D[(*it)->mNumVertices];
+            (*it)->mNumFaces = (*it)->mNumVertices = 0;
+        }
+
+        for (int i = 0; i < mesh->totface; ++i) {
+            const TFace *v = &mesh->tface[i];
+
+            aiMesh *const out = temp[mat_num_to_mesh_idx[mesh->mface[i].mat_nr]];
+            const aiFace &f = out->mFaces[out->mNumFaces++];
+
+            aiVector3D *vo = &out->mTextureCoords[0][out->mNumVertices];
+            for (unsigned int j = 0; j < f.mNumIndices; ++j, ++vo, ++out->mNumVertices) {
+                vo->x = v->uv[j][0];
+                vo->y = v->uv[j][1];
+            }
+        }
+    }
+
+    // collect vertex colors, stored separately as well
+    if (mesh->mcol || mesh->mloopcol) {
+        if (mesh->totface > static_cast<int>((mesh->mcol.size() / 4))) {
+            ThrowException("Number of faces is larger than the corresponding color face array");
+        }
+        for (std::vector<aiMesh *>::iterator it = temp->begin() + old; it != temp->end(); ++it) {
+            ai_assert(0 != (*it)->mNumVertices);
+            ai_assert(0 != (*it)->mNumFaces);
+
+            (*it)->mColors[0] = new aiColor4D[(*it)->mNumVertices];
+            (*it)->mNumFaces = (*it)->mNumVertices = 0;
+        }
+
+        for (int i = 0; i < mesh->totface; ++i) {
+
+            aiMesh *const out = temp[mat_num_to_mesh_idx[mesh->mface[i].mat_nr]];
+            const aiFace &f = out->mFaces[out->mNumFaces++];
+
+            aiColor4D *vo = &out->mColors[0][out->mNumVertices];
+            for (unsigned int n = 0; n < f.mNumIndices; ++n, ++vo, ++out->mNumVertices) {
+                const MCol *col = &mesh->mcol[(i << 2) + n];
+
+                vo->r = col->r;
+                vo->g = col->g;
+                vo->b = col->b;
+                vo->a = col->a;
+            }
+            for (unsigned int n = f.mNumIndices; n < 4; ++n)
+                ;
+        }
+
+        for (int i = 0; i < mesh->totpoly; ++i) {
+            const MPoly &v = mesh->mpoly[i];
+            aiMesh *const out = temp[mat_num_to_mesh_idx[v.mat_nr]];
+            const aiFace &f = out->mFaces[out->mNumFaces++];
+
+            aiColor4D *vo = &out->mColors[0][out->mNumVertices];
+            const ai_real scaleZeroToOne = 1.f / 255.f;
+            for (unsigned int j = 0; j < f.mNumIndices; ++j, ++vo, ++out->mNumVertices) {
+                const MLoopCol &col = mesh->mloopcol[v.loopstart + j];
+                vo->r = ai_real(col.r) * scaleZeroToOne;
+                vo->g = ai_real(col.g) * scaleZeroToOne;
+                vo->b = ai_real(col.b) * scaleZeroToOne;
+                vo->a = ai_real(col.a) * scaleZeroToOne;
+            }
+        }
+    }
+
+    return;
+}
+
+// ------------------------------------------------------------------------------------------------
+aiCamera *BlenderImporter::ConvertCamera(const Scene & /*in*/, const Object *obj, const Camera *cam, ConversionData & /*conv_data*/) {
+    std::unique_ptr<aiCamera> out(new aiCamera());
+    out->mName = obj->id.name + 2;
+    out->mPosition = aiVector3D(0.f, 0.f, 0.f);
+    out->mUp = aiVector3D(0.f, 1.f, 0.f);
+    out->mLookAt = aiVector3D(0.f, 0.f, -1.f);
+    if (cam->sensor_x && cam->lens) {
+        out->mHorizontalFOV = 2.f * std::atan2(cam->sensor_x, 2.f * cam->lens);
+    }
+    out->mClipPlaneNear = cam->clipsta;
+    out->mClipPlaneFar = cam->clipend;
+
+    return out.release();
+}
+
+// ------------------------------------------------------------------------------------------------
+aiLight *BlenderImporter::ConvertLight(const Scene & /*in*/, const Object *obj, const Lamp *lamp, ConversionData & /*conv_data*/) {
+    std::unique_ptr<aiLight> out(new aiLight());
+    out->mName = obj->id.name + 2;
+
+    switch (lamp->type) {
+    case Lamp::Type_Local:
+        out->mType = aiLightSource_POINT;
+        break;
+    case Lamp::Type_Spot:
+        out->mType = aiLightSource_SPOT;
+
+        // blender orients directional lights as facing toward -z
+        out->mDirection = aiVector3D(0.f, 0.f, -1.f);
+        out->mUp = aiVector3D(0.f, 1.f, 0.f);
+
+        out->mAngleInnerCone = lamp->spotsize * (1.0f - lamp->spotblend);
+        out->mAngleOuterCone = lamp->spotsize;
+        break;
+    case Lamp::Type_Sun:
+        out->mType = aiLightSource_DIRECTIONAL;
+
+        // blender orients directional lights as facing toward -z
+        out->mDirection = aiVector3D(0.f, 0.f, -1.f);
+        out->mUp = aiVector3D(0.f, 1.f, 0.f);
+        break;
+
+    case Lamp::Type_Area:
+        out->mType = aiLightSource_AREA;
+
+        if (lamp->area_shape == 0) {
+            out->mSize = aiVector2D(lamp->area_size, lamp->area_size);
+        } else {
+            out->mSize = aiVector2D(lamp->area_size, lamp->area_sizey);
+        }
+
+        // blender orients directional lights as facing toward -z
+        out->mDirection = aiVector3D(0.f, 0.f, -1.f);
+        out->mUp = aiVector3D(0.f, 1.f, 0.f);
+        break;
+
+    default:
+        break;
+    }
+
+    out->mColorAmbient = aiColor3D(lamp->r, lamp->g, lamp->b) * lamp->energy;
+    out->mColorSpecular = aiColor3D(lamp->r, lamp->g, lamp->b) * lamp->energy;
+    out->mColorDiffuse = aiColor3D(lamp->r, lamp->g, lamp->b) * lamp->energy;
+
+    // If default values are supplied, compute the coefficients from light's max distance
+    // Read this: https://imdoingitwrong.wordpress.com/2011/01/31/light-attenuation/
+    //
+    if (lamp->constant_coefficient == 1.0f && lamp->linear_coefficient == 0.0f && lamp->quadratic_coefficient == 0.0f && lamp->dist > 0.0f) {
+        out->mAttenuationConstant = 1.0f;
+        out->mAttenuationLinear = 2.0f / lamp->dist;
+        out->mAttenuationQuadratic = 1.0f / (lamp->dist * lamp->dist);
+    } else {
+        out->mAttenuationConstant = lamp->constant_coefficient;
+        out->mAttenuationLinear = lamp->linear_coefficient;
+        out->mAttenuationQuadratic = lamp->quadratic_coefficient;
+    }
+
+    return out.release();
+}
+
+// ------------------------------------------------------------------------------------------------
+aiNode *BlenderImporter::ConvertNode(const Scene &in, const Object *obj, ConversionData &conv_data, const aiMatrix4x4 &parentTransform) {
+    std::deque<const Object *> children;
+    for (ObjectSet::iterator it = conv_data.objects.begin(); it != conv_data.objects.end();) {
+        const Object *object = *it;
+        if (object->parent == obj) {
+            children.push_back(object);
+
+            conv_data.objects.erase(it++);
+            continue;
+        }
+        ++it;
+    }
+
+    std::unique_ptr<aiNode> node(new aiNode(obj->id.name + 2)); // skip over the name prefix 'OB'
+    if (obj->data) {
+        switch (obj->type) {
+        case Object ::Type_EMPTY:
+            break; // do nothing
+
+            // supported object types
+        case Object ::Type_MESH: {
+            const size_t old = conv_data.meshes->size();
+
+            CheckActualType(obj->data.get(), "Mesh");
+            ConvertMesh(in, obj, static_cast<const Mesh *>(obj->data.get()), conv_data, conv_data.meshes);
+
+            if (conv_data.meshes->size() > old) {
+                node->mMeshes = new unsigned int[node->mNumMeshes = static_cast<unsigned int>(conv_data.meshes->size() - old)];
+                for (unsigned int i = 0; i < node->mNumMeshes; ++i) {
+                    node->mMeshes[i] = static_cast<unsigned int>(i + old);
+                }
+            }
+        } break;
+        case Object ::Type_LAMP: {
+            CheckActualType(obj->data.get(), "Lamp");
+            aiLight *mesh = ConvertLight(in, obj, static_cast<const Lamp *>(obj->data.get()), conv_data);
+
+            if (mesh) {
+                conv_data.lights->push_back(mesh);
+            }
+        } break;
+        case Object ::Type_CAMERA: {
+            CheckActualType(obj->data.get(), "Camera");
+            aiCamera *mesh = ConvertCamera(in, obj, static_cast<const Camera *>(obj->data.get()), conv_data);
+
+            if (mesh) {
+                conv_data.cameras->push_back(mesh);
+            }
+        } break;
+
+            // unsupported object types / log, but do not break
+        case Object ::Type_CURVE:
+            NotSupportedObjectType(obj, "Curve");
+            break;
+        case Object ::Type_SURF:
+            NotSupportedObjectType(obj, "Surface");
+            break;
+        case Object ::Type_FONT:
+            NotSupportedObjectType(obj, "Font");
+            break;
+        case Object ::Type_MBALL:
+            NotSupportedObjectType(obj, "MetaBall");
+            break;
+        case Object ::Type_WAVE:
+            NotSupportedObjectType(obj, "Wave");
+            break;
+        case Object ::Type_LATTICE:
+            NotSupportedObjectType(obj, "Lattice");
+            break;
+
+            // invalid or unknown type
+        default:
+            break;
+        }
+    }
+
+    for (unsigned int x = 0; x < 4; ++x) {
+        for (unsigned int y = 0; y < 4; ++y) {
+            node->mTransformation[y][x] = obj->obmat[x][y];
+        }
+    }
+
+    aiMatrix4x4 m = parentTransform;
+    m = m.Inverse();
+
+    node->mTransformation = m * node->mTransformation;
+
+    if (children.size()) {
+        node->mNumChildren = static_cast<unsigned int>(children.size());
+        aiNode **nd = node->mChildren = new aiNode *[node->mNumChildren]();
+        for (const Object *nobj : children) {
+            *nd = ConvertNode(in, nobj, conv_data, node->mTransformation * parentTransform);
+            (*nd++)->mParent = node.get();
+        }
+    }
+
+    // apply modifiers
+    modifier_cache->ApplyModifiers(*node, conv_data, in, *obj);
+
+    return node.release();
+}
+
+#endif // ASSIMP_BUILD_NO_BLEND_IMPORTER