NvCloth 1.1.4 Release. (24070740)

1 files changed, 3356 insertions, 0 deletions

diff --git a/NvCloth/samples/external/assimp-4.1.0/code/FBXConverter.cpp b/NvCloth/samples/external/assimp-4.1.0/code/FBXConverter.cpp
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+++ b/NvCloth/samples/external/assimp-4.1.0/code/FBXConverter.cpp
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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2017, 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  FBXConverter.cpp
+ *  @brief Implementation of the FBX DOM -> aiScene converter
+ */
+
+#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER
+
+#include "FBXConverter.h"
+#include "FBXParser.h"
+#include "FBXMeshGeometry.h"
+#include "FBXDocument.h"
+#include "FBXUtil.h"
+#include "FBXProperties.h"
+#include "FBXImporter.h"
+#include "StringComparison.h"
+
+#include <assimp/scene.h>
+
+#include <tuple>
+#include <memory>
+#include <iterator>
+#include <vector>
+
+namespace Assimp {
+namespace FBX {
+
+using namespace Util;
+
+
+#define MAGIC_NODE_TAG "_$AssimpFbx$"
+
+#define CONVERT_FBX_TIME(time) static_cast<double>(time) / 46186158000L
+
+// XXX vc9's debugger won't step into anonymous namespaces
+//namespace {
+
+/** Dummy class to encapsulate the conversion process */
+class Converter
+{
+public:
+    /**
+     *  The different parts that make up the final local transformation of a fbx-node
+     */
+    enum TransformationComp
+    {
+        TransformationComp_Translation = 0,
+        TransformationComp_RotationOffset,
+        TransformationComp_RotationPivot,
+        TransformationComp_PreRotation,
+        TransformationComp_Rotation,
+        TransformationComp_PostRotation,
+        TransformationComp_RotationPivotInverse,
+        TransformationComp_ScalingOffset,
+        TransformationComp_ScalingPivot,
+        TransformationComp_Scaling,
+        TransformationComp_ScalingPivotInverse,
+        TransformationComp_GeometricTranslation,
+        TransformationComp_GeometricRotation,
+        TransformationComp_GeometricScaling,
+
+        TransformationComp_MAXIMUM
+    };
+
+public:
+    Converter( aiScene* out, const Document& doc );
+    ~Converter();
+
+private:
+    // ------------------------------------------------------------------------------------------------
+    // find scene root and trigger recursive scene conversion
+    void ConvertRootNode();
+
+    // ------------------------------------------------------------------------------------------------
+    // collect and assign child nodes
+    void ConvertNodes( uint64_t id, aiNode& parent, const aiMatrix4x4& parent_transform = aiMatrix4x4() );
+
+    // ------------------------------------------------------------------------------------------------
+    void ConvertLights( const Model& model );
+
+    // ------------------------------------------------------------------------------------------------
+    void ConvertCameras( const Model& model );
+
+    // ------------------------------------------------------------------------------------------------
+    void ConvertLight( const Model& model, const Light& light );
+
+    // ------------------------------------------------------------------------------------------------
+    void ConvertCamera( const Model& model, const Camera& cam );
+
+    // ------------------------------------------------------------------------------------------------
+    // this returns unified names usable within assimp identifiers (i.e. no space characters -
+    // while these would be allowed, they are a potential trouble spot so better not use them).
+    const char* NameTransformationComp( TransformationComp comp );
+
+    // ------------------------------------------------------------------------------------------------
+    // note: this returns the REAL fbx property names
+    const char* NameTransformationCompProperty( TransformationComp comp );
+
+    // ------------------------------------------------------------------------------------------------
+    aiVector3D TransformationCompDefaultValue( TransformationComp comp );
+
+    // ------------------------------------------------------------------------------------------------
+    void GetRotationMatrix( Model::RotOrder mode, const aiVector3D& rotation, aiMatrix4x4& out );
+    // ------------------------------------------------------------------------------------------------
+    /**
+     *  checks if a node has more than just scaling, rotation and translation components
+     */
+    bool NeedsComplexTransformationChain( const Model& model );
+
+    // ------------------------------------------------------------------------------------------------
+    // note: name must be a FixNodeName() result
+    std::string NameTransformationChainNode( const std::string& name, TransformationComp comp );
+
+    // ------------------------------------------------------------------------------------------------
+    /**
+     *  note: memory for output_nodes will be managed by the caller
+     */
+    void GenerateTransformationNodeChain( const Model& model, std::vector<aiNode*>& output_nodes );
+
+    // ------------------------------------------------------------------------------------------------
+    void SetupNodeMetadata( const Model& model, aiNode& nd );
+
+    // ------------------------------------------------------------------------------------------------
+    void ConvertModel( const Model& model, aiNode& nd, const aiMatrix4x4& node_global_transform );
+
+    // ------------------------------------------------------------------------------------------------
+    // MeshGeometry -> aiMesh, return mesh index + 1 or 0 if the conversion failed
+    std::vector<unsigned int> ConvertMesh( const MeshGeometry& mesh, const Model& model,
+        const aiMatrix4x4& node_global_transform );
+
+    // ------------------------------------------------------------------------------------------------
+    aiMesh* SetupEmptyMesh( const MeshGeometry& mesh );
+
+    // ------------------------------------------------------------------------------------------------
+    unsigned int ConvertMeshSingleMaterial( const MeshGeometry& mesh, const Model& model,
+        const aiMatrix4x4& node_global_transform );
+
+    // ------------------------------------------------------------------------------------------------
+    std::vector<unsigned int> ConvertMeshMultiMaterial( const MeshGeometry& mesh, const Model& model,
+        const aiMatrix4x4& node_global_transform );
+
+    // ------------------------------------------------------------------------------------------------
+    unsigned int ConvertMeshMultiMaterial( const MeshGeometry& mesh, const Model& model,
+        MatIndexArray::value_type index,
+        const aiMatrix4x4& node_global_transform );
+
+    // ------------------------------------------------------------------------------------------------
+    static const unsigned int NO_MATERIAL_SEPARATION = /* std::numeric_limits<unsigned int>::max() */
+        static_cast<unsigned int>(-1);
+
+    // ------------------------------------------------------------------------------------------------
+    /**
+     *  - if materialIndex == NO_MATERIAL_SEPARATION, materials are not taken into
+     *    account when determining which weights to include.
+     *  - outputVertStartIndices is only used when a material index is specified, it gives for
+     *    each output vertex the DOM index it maps to.
+     */
+    void ConvertWeights( aiMesh* out, const Model& model, const MeshGeometry& geo,
+        const aiMatrix4x4& node_global_transform = aiMatrix4x4(),
+        unsigned int materialIndex = NO_MATERIAL_SEPARATION,
+        std::vector<unsigned int>* outputVertStartIndices = NULL );
+
+    // ------------------------------------------------------------------------------------------------
+    void ConvertCluster( std::vector<aiBone*>& bones, const Model& /*model*/, const Cluster& cl,
+        std::vector<size_t>& out_indices,
+        std::vector<size_t>& index_out_indices,
+        std::vector<size_t>& count_out_indices,
+        const aiMatrix4x4& node_global_transform );
+
+    // ------------------------------------------------------------------------------------------------
+    void ConvertMaterialForMesh( aiMesh* out, const Model& model, const MeshGeometry& geo,
+        MatIndexArray::value_type materialIndex );
+
+    // ------------------------------------------------------------------------------------------------
+    unsigned int GetDefaultMaterial();
+
+
+    // ------------------------------------------------------------------------------------------------
+    // Material -> aiMaterial
+    unsigned int ConvertMaterial( const Material& material, const MeshGeometry* const mesh );
+
+    // ------------------------------------------------------------------------------------------------
+    // Video -> aiTexture
+    unsigned int ConvertVideo( const Video& video );
+
+    // ------------------------------------------------------------------------------------------------
+    void TrySetTextureProperties( aiMaterial* out_mat, const TextureMap& textures,
+        const std::string& propName,
+        aiTextureType target, const MeshGeometry* const mesh );
+
+    // ------------------------------------------------------------------------------------------------
+    void TrySetTextureProperties( aiMaterial* out_mat, const LayeredTextureMap& layeredTextures,
+        const std::string& propName,
+        aiTextureType target, const MeshGeometry* const mesh );
+
+    // ------------------------------------------------------------------------------------------------
+    void SetTextureProperties( aiMaterial* out_mat, const TextureMap& textures, const MeshGeometry* const mesh );
+
+    // ------------------------------------------------------------------------------------------------
+    void SetTextureProperties( aiMaterial* out_mat, const LayeredTextureMap& layeredTextures, const MeshGeometry* const mesh );
+
+    // ------------------------------------------------------------------------------------------------
+    aiColor3D GetColorPropertyFromMaterial( const PropertyTable& props, const std::string& baseName,
+        bool& result );
+
+    // ------------------------------------------------------------------------------------------------
+    void SetShadingPropertiesCommon( aiMaterial* out_mat, const PropertyTable& props );
+
+    // ------------------------------------------------------------------------------------------------
+    // get the number of fps for a FrameRate enumerated value
+    static double FrameRateToDouble( FileGlobalSettings::FrameRate fp, double customFPSVal = -1.0 );
+
+    // ------------------------------------------------------------------------------------------------
+    // convert animation data to aiAnimation et al
+    void ConvertAnimations();
+
+    // ------------------------------------------------------------------------------------------------
+    // rename a node already partially converted. fixed_name is a string previously returned by
+    // FixNodeName, new_name specifies the string FixNodeName should return on all further invocations
+    // which would previously have returned the old value.
+    //
+    // this also updates names in node animations, cameras and light sources and is thus slow.
+    //
+    // NOTE: the caller is responsible for ensuring that the new name is unique and does
+    // not collide with any other identifiers. The best way to ensure this is to only
+    // append to the old name, which is guaranteed to match these requirements.
+    void RenameNode( const std::string& fixed_name, const std::string& new_name );
+
+    // ------------------------------------------------------------------------------------------------
+    // takes a fbx node name and returns the identifier to be used in the assimp output scene.
+    // the function is guaranteed to provide consistent results over multiple invocations
+    // UNLESS RenameNode() is called for a particular node name.
+    std::string FixNodeName( const std::string& name );
+
+    typedef std::map<const AnimationCurveNode*, const AnimationLayer*> LayerMap;
+
+    // XXX: better use multi_map ..
+    typedef std::map<std::string, std::vector<const AnimationCurveNode*> > NodeMap;
+
+
+    // ------------------------------------------------------------------------------------------------
+    void ConvertAnimationStack( const AnimationStack& st );
+
+    // ------------------------------------------------------------------------------------------------
+    void GenerateNodeAnimations( std::vector<aiNodeAnim*>& node_anims,
+        const std::string& fixed_name,
+        const std::vector<const AnimationCurveNode*>& curves,
+        const LayerMap& layer_map,
+        int64_t start, int64_t stop,
+        double& max_time,
+        double& min_time );
+
+    // ------------------------------------------------------------------------------------------------
+    bool IsRedundantAnimationData( const Model& target,
+        TransformationComp comp,
+        const std::vector<const AnimationCurveNode*>& curves );
+
+    // ------------------------------------------------------------------------------------------------
+    aiNodeAnim* GenerateRotationNodeAnim( const std::string& name,
+        const Model& target,
+        const std::vector<const AnimationCurveNode*>& curves,
+        const LayerMap& layer_map,
+        int64_t start, int64_t stop,
+        double& max_time,
+        double& min_time );
+
+    // ------------------------------------------------------------------------------------------------
+    aiNodeAnim* GenerateScalingNodeAnim( const std::string& name,
+        const Model& /*target*/,
+        const std::vector<const AnimationCurveNode*>& curves,
+        const LayerMap& layer_map,
+        int64_t start, int64_t stop,
+        double& max_time,
+        double& min_time );
+
+    // ------------------------------------------------------------------------------------------------
+    aiNodeAnim* GenerateTranslationNodeAnim( const std::string& name,
+        const Model& /*target*/,
+        const std::vector<const AnimationCurveNode*>& curves,
+        const LayerMap& layer_map,
+        int64_t start, int64_t stop,
+        double& max_time,
+        double& min_time,
+        bool inverse = false );
+
+    // ------------------------------------------------------------------------------------------------
+    // generate node anim, extracting only Rotation, Scaling and Translation from the given chain
+    aiNodeAnim* GenerateSimpleNodeAnim( const std::string& name,
+        const Model& target,
+        NodeMap::const_iterator chain[ TransformationComp_MAXIMUM ],
+        NodeMap::const_iterator iter_end,
+        const LayerMap& layer_map,
+        int64_t start, int64_t stop,
+        double& max_time,
+        double& min_time,
+        bool reverse_order = false );
+
+    // key (time), value, mapto (component index)
+    typedef std::tuple<std::shared_ptr<KeyTimeList>, std::shared_ptr<KeyValueList>, unsigned int > KeyFrameList;
+    typedef std::vector<KeyFrameList> KeyFrameListList;
+
+    // ------------------------------------------------------------------------------------------------
+    KeyFrameListList GetKeyframeList( const std::vector<const AnimationCurveNode*>& nodes, int64_t start, int64_t stop );
+
+    // ------------------------------------------------------------------------------------------------
+    KeyTimeList GetKeyTimeList( const KeyFrameListList& inputs );
+
+    // ------------------------------------------------------------------------------------------------
+    void InterpolateKeys( aiVectorKey* valOut, const KeyTimeList& keys, const KeyFrameListList& inputs,
+        const aiVector3D& def_value,
+        double& max_time,
+        double& min_time );
+
+    // ------------------------------------------------------------------------------------------------
+    void InterpolateKeys( aiQuatKey* valOut, const KeyTimeList& keys, const KeyFrameListList& inputs,
+        const aiVector3D& def_value,
+        double& maxTime,
+        double& minTime,
+        Model::RotOrder order );
+
+    // ------------------------------------------------------------------------------------------------
+    void ConvertTransformOrder_TRStoSRT( aiQuatKey* out_quat, aiVectorKey* out_scale,
+        aiVectorKey* out_translation,
+        const KeyFrameListList& scaling,
+        const KeyFrameListList& translation,
+        const KeyFrameListList& rotation,
+        const KeyTimeList& times,
+        double& maxTime,
+        double& minTime,
+        Model::RotOrder order,
+        const aiVector3D& def_scale,
+        const aiVector3D& def_translate,
+        const aiVector3D& def_rotation );
+
+    // ------------------------------------------------------------------------------------------------
+    // euler xyz -> quat
+    aiQuaternion EulerToQuaternion( const aiVector3D& rot, Model::RotOrder order );
+
+    // ------------------------------------------------------------------------------------------------
+    void ConvertScaleKeys( aiNodeAnim* na, const std::vector<const AnimationCurveNode*>& nodes, const LayerMap& /*layers*/,
+        int64_t start, int64_t stop,
+        double& maxTime,
+        double& minTime );
+
+    // ------------------------------------------------------------------------------------------------
+    void ConvertTranslationKeys( aiNodeAnim* na, const std::vector<const AnimationCurveNode*>& nodes,
+        const LayerMap& /*layers*/,
+        int64_t start, int64_t stop,
+        double& maxTime,
+        double& minTime );
+
+    // ------------------------------------------------------------------------------------------------
+    void ConvertRotationKeys( aiNodeAnim* na, const std::vector<const AnimationCurveNode*>& nodes,
+        const LayerMap& /*layers*/,
+        int64_t start, int64_t stop,
+        double& maxTime,
+        double& minTime,
+        Model::RotOrder order );
+
+    // ------------------------------------------------------------------------------------------------
+    // copy generated meshes, animations, lights, cameras and textures to the output scene
+    void TransferDataToScene();
+
+private:
+
+    // 0: not assigned yet, others: index is value - 1
+    unsigned int defaultMaterialIndex;
+
+    std::vector<aiMesh*> meshes;
+    std::vector<aiMaterial*> materials;
+    std::vector<aiAnimation*> animations;
+    std::vector<aiLight*> lights;
+    std::vector<aiCamera*> cameras;
+    std::vector<aiTexture*> textures;
+
+    typedef std::map<const Material*, unsigned int> MaterialMap;
+    MaterialMap materials_converted;
+
+    typedef std::map<const Video*, unsigned int> VideoMap;
+    VideoMap textures_converted;
+
+    typedef std::map<const Geometry*, std::vector<unsigned int> > MeshMap;
+    MeshMap meshes_converted;
+
+    // fixed node name -> which trafo chain components have animations?
+    typedef std::map<std::string, unsigned int> NodeAnimBitMap;
+    NodeAnimBitMap node_anim_chain_bits;
+
+    // name -> has had its prefix_stripped?
+    typedef std::map<std::string, bool> NodeNameMap;
+    NodeNameMap node_names;
+
+    typedef std::map<std::string, std::string> NameNameMap;
+    NameNameMap renamed_nodes;
+
+    double anim_fps;
+
+    aiScene* const out;
+    const FBX::Document& doc;
+
+	bool FindTextureIndexByFilename(const Video& video, unsigned int& index) {
+		index = 0;
+		const char* videoFileName = video.FileName().c_str();
+		for (auto texture = textures_converted.begin(); texture != textures_converted.end(); ++texture) {
+			if (!strcmp(texture->first->FileName().c_str(), videoFileName)) {
+                index = texture->second;
+				return true;
+			}
+		}
+		return false;
+	}
+};
+
+Converter::Converter( aiScene* out, const Document& doc )
+    : defaultMaterialIndex()
+    , out( out )
+    , doc( doc )
+{
+    // animations need to be converted first since this will
+    // populate the node_anim_chain_bits map, which is needed
+    // to determine which nodes need to be generated.
+    ConvertAnimations();
+    ConvertRootNode();
+
+    if ( doc.Settings().readAllMaterials ) {
+        // unfortunately this means we have to evaluate all objects
+        for( const ObjectMap::value_type& v : doc.Objects() ) {
+
+            const Object* ob = v.second->Get();
+            if ( !ob ) {
+                continue;
+            }
+
+            const Material* mat = dynamic_cast<const Material*>( ob );
+            if ( mat ) {
+
+                if ( materials_converted.find( mat ) == materials_converted.end() ) {
+                    ConvertMaterial( *mat, 0 );
+                }
+            }
+        }
+    }
+
+    TransferDataToScene();
+
+    // if we didn't read any meshes set the AI_SCENE_FLAGS_INCOMPLETE
+    // to make sure the scene passes assimp's validation. FBX files
+    // need not contain geometry (i.e. camera animations, raw armatures).
+    if ( out->mNumMeshes == 0 ) {
+        out->mFlags |= AI_SCENE_FLAGS_INCOMPLETE;
+    }
+}
+
+
+Converter::~Converter()
+{
+    std::for_each( meshes.begin(), meshes.end(), Util::delete_fun<aiMesh>() );
+    std::for_each( materials.begin(), materials.end(), Util::delete_fun<aiMaterial>() );
+    std::for_each( animations.begin(), animations.end(), Util::delete_fun<aiAnimation>() );
+    std::for_each( lights.begin(), lights.end(), Util::delete_fun<aiLight>() );
+    std::for_each( cameras.begin(), cameras.end(), Util::delete_fun<aiCamera>() );
+    std::for_each( textures.begin(), textures.end(), Util::delete_fun<aiTexture>() );
+}
+
+void Converter::ConvertRootNode()
+{
+    out->mRootNode = new aiNode();
+    out->mRootNode->mName.Set( "RootNode" );
+
+    // root has ID 0
+    ConvertNodes( 0L, *out->mRootNode );
+}
+
+
+void Converter::ConvertNodes( uint64_t id, aiNode& parent, const aiMatrix4x4& parent_transform )
+{
+    const std::vector<const Connection*>& conns = doc.GetConnectionsByDestinationSequenced( id, "Model" );
+
+    std::vector<aiNode*> nodes;
+    nodes.reserve( conns.size() );
+
+    std::vector<aiNode*> nodes_chain;
+
+    try {
+        for( const Connection* con : conns ) {
+
+            // ignore object-property links
+            if ( con->PropertyName().length() ) {
+                continue;
+            }
+
+            const Object* const object = con->SourceObject();
+            if ( !object ) {
+                FBXImporter::LogWarn( "failed to convert source object for Model link" );
+                continue;
+            }
+
+            const Model* const model = dynamic_cast<const Model*>( object );
+
+            if ( model ) {
+                nodes_chain.clear();
+
+                aiMatrix4x4 new_abs_transform = parent_transform;
+
+                // even though there is only a single input node, the design of
+                // assimp (or rather: the complicated transformation chain that
+                // is employed by fbx) means that we may need multiple aiNode's
+                // to represent a fbx node's transformation.
+                GenerateTransformationNodeChain( *model, nodes_chain );
+
+                ai_assert( nodes_chain.size() );
+
+                const std::string& original_name = FixNodeName( model->Name() );
+
+                // check if any of the nodes in the chain has the name the fbx node
+                // is supposed to have. If there is none, add another node to
+                // preserve the name - people might have scripts etc. that rely
+                // on specific node names.
+                aiNode* name_carrier = NULL;
+                for( aiNode* prenode : nodes_chain ) {
+                    if ( !strcmp( prenode->mName.C_Str(), original_name.c_str() ) ) {
+                        name_carrier = prenode;
+                        break;
+                    }
+                }
+
+                if ( !name_carrier ) {
+                    nodes_chain.push_back( new aiNode( original_name ) );
+                }
+
+                //setup metadata on newest node
+                SetupNodeMetadata( *model, *nodes_chain.back() );
+
+                // link all nodes in a row
+                aiNode* last_parent = &parent;
+                for( aiNode* prenode : nodes_chain ) {
+                    ai_assert( prenode );
+
+                    if ( last_parent != &parent ) {
+                        last_parent->mNumChildren = 1;
+                        last_parent->mChildren = new aiNode*[ 1 ];
+                        last_parent->mChildren[ 0 ] = prenode;
+                    }
+
+                    prenode->mParent = last_parent;
+                    last_parent = prenode;
+
+                    new_abs_transform *= prenode->mTransformation;
+                }
+
+                // attach geometry
+                ConvertModel( *model, *nodes_chain.back(), new_abs_transform );
+
+                // attach sub-nodes
+                ConvertNodes( model->ID(), *nodes_chain.back(), new_abs_transform );
+
+                if ( doc.Settings().readLights ) {
+                    ConvertLights( *model );
+                }
+
+                if ( doc.Settings().readCameras ) {
+                    ConvertCameras( *model );
+                }
+
+                nodes.push_back( nodes_chain.front() );
+                nodes_chain.clear();
+            }
+        }
+
+        if ( nodes.size() ) {
+            parent.mChildren = new aiNode*[ nodes.size() ]();
+            parent.mNumChildren = static_cast<unsigned int>( nodes.size() );
+
+            std::swap_ranges( nodes.begin(), nodes.end(), parent.mChildren );
+        }
+    }
+    catch ( std::exception& ) {
+        Util::delete_fun<aiNode> deleter;
+        std::for_each( nodes.begin(), nodes.end(), deleter );
+        std::for_each( nodes_chain.begin(), nodes_chain.end(), deleter );
+    }
+}
+
+
+void Converter::ConvertLights( const Model& model )
+{
+    const std::vector<const NodeAttribute*>& node_attrs = model.GetAttributes();
+    for( const NodeAttribute* attr : node_attrs ) {
+        const Light* const light = dynamic_cast<const Light*>( attr );
+        if ( light ) {
+            ConvertLight( model, *light );
+        }
+    }
+}
+
+void Converter::ConvertCameras( const Model& model )
+{
+    const std::vector<const NodeAttribute*>& node_attrs = model.GetAttributes();
+    for( const NodeAttribute* attr : node_attrs ) {
+        const Camera* const cam = dynamic_cast<const Camera*>( attr );
+        if ( cam ) {
+            ConvertCamera( model, *cam );
+        }
+    }
+}
+
+void Converter::ConvertLight( const Model& model, const Light& light )
+{
+    lights.push_back( new aiLight() );
+    aiLight* const out_light = lights.back();
+
+    out_light->mName.Set( FixNodeName( model.Name() ) );
+
+    const float intensity = light.Intensity() / 100.0f;
+    const aiVector3D& col = light.Color();
+
+    out_light->mColorDiffuse = aiColor3D( col.x, col.y, col.z );
+    out_light->mColorDiffuse.r *= intensity;
+    out_light->mColorDiffuse.g *= intensity;
+    out_light->mColorDiffuse.b *= intensity;
+
+    out_light->mColorSpecular = out_light->mColorDiffuse;
+
+    //lights are defined along negative y direction
+    out_light->mPosition = aiVector3D(0.0f);
+    out_light->mDirection = aiVector3D(0.0f, -1.0f, 0.0f);
+    out_light->mUp = aiVector3D(0.0f, 0.0f, -1.0f);
+
+    switch ( light.LightType() )
+    {
+    case Light::Type_Point:
+        out_light->mType = aiLightSource_POINT;
+        break;
+
+    case Light::Type_Directional:
+        out_light->mType = aiLightSource_DIRECTIONAL;
+        break;
+
+    case Light::Type_Spot:
+        out_light->mType = aiLightSource_SPOT;
+        out_light->mAngleOuterCone = AI_DEG_TO_RAD( light.OuterAngle() );
+        out_light->mAngleInnerCone = AI_DEG_TO_RAD( light.InnerAngle() );
+        break;
+
+    case Light::Type_Area:
+        FBXImporter::LogWarn( "cannot represent area light, set to UNDEFINED" );
+        out_light->mType = aiLightSource_UNDEFINED;
+        break;
+
+    case Light::Type_Volume:
+        FBXImporter::LogWarn( "cannot represent volume light, set to UNDEFINED" );
+        out_light->mType = aiLightSource_UNDEFINED;
+        break;
+    default:
+        ai_assert( false );
+    }
+
+    float decay = light.DecayStart();
+    switch ( light.DecayType() )
+    {
+    case Light::Decay_None:
+        out_light->mAttenuationConstant = decay;
+        out_light->mAttenuationLinear = 0.0f;
+        out_light->mAttenuationQuadratic = 0.0f;
+        break;
+    case Light::Decay_Linear:
+        out_light->mAttenuationConstant = 0.0f;
+        out_light->mAttenuationLinear = 2.0f / decay;
+        out_light->mAttenuationQuadratic = 0.0f;
+        break;
+    case Light::Decay_Quadratic:
+        out_light->mAttenuationConstant = 0.0f;
+        out_light->mAttenuationLinear = 0.0f;
+        out_light->mAttenuationQuadratic = 2.0f / (decay * decay);
+        break;
+    case Light::Decay_Cubic:
+        FBXImporter::LogWarn( "cannot represent cubic attenuation, set to Quadratic" );
+        out_light->mAttenuationQuadratic = 1.0f;
+        break;
+    default:
+        ai_assert( false );
+    }
+}
+
+void Converter::ConvertCamera( const Model& model, const Camera& cam )
+{
+    cameras.push_back( new aiCamera() );
+    aiCamera* const out_camera = cameras.back();
+
+    out_camera->mName.Set( FixNodeName( model.Name() ) );
+
+    out_camera->mAspect = cam.AspectWidth() / cam.AspectHeight();
+    //cameras are defined along positive x direction
+    out_camera->mPosition = aiVector3D(0.0f);
+    out_camera->mLookAt = aiVector3D(1.0f, 0.0f, 0.0f);
+    out_camera->mUp = aiVector3D(0.0f, 1.0f, 0.0f);
+    out_camera->mHorizontalFOV = AI_DEG_TO_RAD( cam.FieldOfView() );
+    out_camera->mClipPlaneNear = cam.NearPlane();
+    out_camera->mClipPlaneFar = cam.FarPlane();
+}
+
+
+const char* Converter::NameTransformationComp( TransformationComp comp )
+{
+    switch ( comp )
+    {
+    case TransformationComp_Translation:
+        return "Translation";
+    case TransformationComp_RotationOffset:
+        return "RotationOffset";
+    case TransformationComp_RotationPivot:
+        return "RotationPivot";
+    case TransformationComp_PreRotation:
+        return "PreRotation";
+    case TransformationComp_Rotation:
+        return "Rotation";
+    case TransformationComp_PostRotation:
+        return "PostRotation";
+    case TransformationComp_RotationPivotInverse:
+        return "RotationPivotInverse";
+    case TransformationComp_ScalingOffset:
+        return "ScalingOffset";
+    case TransformationComp_ScalingPivot:
+        return "ScalingPivot";
+    case TransformationComp_Scaling:
+        return "Scaling";
+    case TransformationComp_ScalingPivotInverse:
+        return "ScalingPivotInverse";
+    case TransformationComp_GeometricScaling:
+        return "GeometricScaling";
+    case TransformationComp_GeometricRotation:
+        return "GeometricRotation";
+    case TransformationComp_GeometricTranslation:
+        return "GeometricTranslation";
+    case TransformationComp_MAXIMUM: // this is to silence compiler warnings
+    default:
+        break;
+    }
+
+    ai_assert( false );
+    return NULL;
+}
+
+const char* Converter::NameTransformationCompProperty( TransformationComp comp )
+{
+    switch ( comp )
+    {
+    case TransformationComp_Translation:
+        return "Lcl Translation";
+    case TransformationComp_RotationOffset:
+        return "RotationOffset";
+    case TransformationComp_RotationPivot:
+        return "RotationPivot";
+    case TransformationComp_PreRotation:
+        return "PreRotation";
+    case TransformationComp_Rotation:
+        return "Lcl Rotation";
+    case TransformationComp_PostRotation:
+        return "PostRotation";
+    case TransformationComp_RotationPivotInverse:
+        return "RotationPivotInverse";
+    case TransformationComp_ScalingOffset:
+        return "ScalingOffset";
+    case TransformationComp_ScalingPivot:
+        return "ScalingPivot";
+    case TransformationComp_Scaling:
+        return "Lcl Scaling";
+    case TransformationComp_ScalingPivotInverse:
+        return "ScalingPivotInverse";
+    case TransformationComp_GeometricScaling:
+        return "GeometricScaling";
+    case TransformationComp_GeometricRotation:
+        return "GeometricRotation";
+    case TransformationComp_GeometricTranslation:
+        return "GeometricTranslation";
+    case TransformationComp_MAXIMUM: // this is to silence compiler warnings
+        break;
+    }
+
+    ai_assert( false );
+    return NULL;
+}
+
+aiVector3D Converter::TransformationCompDefaultValue( TransformationComp comp )
+{
+    // XXX a neat way to solve the never-ending special cases for scaling
+    // would be to do everything in log space!
+    return comp == TransformationComp_Scaling ? aiVector3D( 1.f, 1.f, 1.f ) : aiVector3D();
+}
+
+void Converter::GetRotationMatrix( Model::RotOrder mode, const aiVector3D& rotation, aiMatrix4x4& out )
+{
+    if ( mode == Model::RotOrder_SphericXYZ ) {
+        FBXImporter::LogError( "Unsupported RotationMode: SphericXYZ" );
+        out = aiMatrix4x4();
+        return;
+    }
+
+    const float angle_epsilon = 1e-6f;
+
+    out = aiMatrix4x4();
+
+    bool is_id[ 3 ] = { true, true, true };
+
+    aiMatrix4x4 temp[ 3 ];
+    if ( std::fabs( rotation.z ) > angle_epsilon ) {
+        aiMatrix4x4::RotationZ( AI_DEG_TO_RAD( rotation.z ), temp[ 2 ] );
+        is_id[ 2 ] = false;
+    }
+    if ( std::fabs( rotation.y ) > angle_epsilon ) {
+        aiMatrix4x4::RotationY( AI_DEG_TO_RAD( rotation.y ), temp[ 1 ] );
+        is_id[ 1 ] = false;
+    }
+    if ( std::fabs( rotation.x ) > angle_epsilon ) {
+        aiMatrix4x4::RotationX( AI_DEG_TO_RAD( rotation.x ), temp[ 0 ] );
+        is_id[ 0 ] = false;
+    }
+
+    int order[ 3 ] = { -1, -1, -1 };
+
+    // note: rotation order is inverted since we're left multiplying as is usual in assimp
+    switch ( mode )
+    {
+    case Model::RotOrder_EulerXYZ:
+        order[ 0 ] = 2;
+        order[ 1 ] = 1;
+        order[ 2 ] = 0;
+        break;
+
+    case Model::RotOrder_EulerXZY:
+        order[ 0 ] = 1;
+        order[ 1 ] = 2;
+        order[ 2 ] = 0;
+        break;
+
+    case Model::RotOrder_EulerYZX:
+        order[ 0 ] = 0;
+        order[ 1 ] = 2;
+        order[ 2 ] = 1;
+        break;
+
+    case Model::RotOrder_EulerYXZ:
+        order[ 0 ] = 2;
+        order[ 1 ] = 0;
+        order[ 2 ] = 1;
+        break;
+
+    case Model::RotOrder_EulerZXY:
+        order[ 0 ] = 1;
+        order[ 1 ] = 0;
+        order[ 2 ] = 2;
+        break;
+
+    case Model::RotOrder_EulerZYX:
+        order[ 0 ] = 0;
+        order[ 1 ] = 1;
+        order[ 2 ] = 2;
+        break;
+
+    default:
+        ai_assert( false );
+    }
+
+    ai_assert( ( order[ 0 ] >= 0 ) && ( order[ 0 ] <= 2 ) );
+    ai_assert( ( order[ 1 ] >= 0 ) && ( order[ 1 ] <= 2 ) );
+    ai_assert( ( order[ 2 ] >= 0 ) && ( order[ 2 ] <= 2 ) );
+
+    if ( !is_id[ order[ 0 ] ] ) {
+        out = temp[ order[ 0 ] ];
+    }
+
+    if ( !is_id[ order[ 1 ] ] ) {
+        out = out * temp[ order[ 1 ] ];
+    }
+
+    if ( !is_id[ order[ 2 ] ] ) {
+        out = out * temp[ order[ 2 ] ];
+    }
+}
+
+bool Converter::NeedsComplexTransformationChain( const Model& model )
+{
+    const PropertyTable& props = model.Props();
+    bool ok;
+
+    const float zero_epsilon = 1e-6f;
+    for ( size_t i = 0; i < TransformationComp_MAXIMUM; ++i ) {
+        const TransformationComp comp = static_cast< TransformationComp >( i );
+
+        if ( comp == TransformationComp_Rotation || comp == TransformationComp_Scaling || comp == TransformationComp_Translation ||
+                comp == TransformationComp_GeometricScaling || comp == TransformationComp_GeometricRotation || comp == TransformationComp_GeometricTranslation ) {
+            continue;
+        }
+
+        const aiVector3D& v = PropertyGet<aiVector3D>( props, NameTransformationCompProperty( comp ), ok );
+        if ( ok && v.SquareLength() > zero_epsilon ) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+std::string Converter::NameTransformationChainNode( const std::string& name, TransformationComp comp )
+{
+    return name + std::string( MAGIC_NODE_TAG ) + "_" + NameTransformationComp( comp );
+}
+
+void Converter::GenerateTransformationNodeChain( const Model& model, std::vector<aiNode*>& output_nodes )
+{
+    const PropertyTable& props = model.Props();
+    const Model::RotOrder rot = model.RotationOrder();
+
+    bool ok;
+
+    aiMatrix4x4 chain[ TransformationComp_MAXIMUM ];
+    std::fill_n( chain, static_cast<unsigned int>( TransformationComp_MAXIMUM ), aiMatrix4x4() );
+
+    // generate transformation matrices for all the different transformation components
+    const float zero_epsilon = 1e-6f;
+    bool is_complex = false;
+
+    const aiVector3D& PreRotation = PropertyGet<aiVector3D>( props, "PreRotation", ok );
+    if ( ok && PreRotation.SquareLength() > zero_epsilon ) {
+        is_complex = true;
+
+        GetRotationMatrix( rot, PreRotation, chain[ TransformationComp_PreRotation ] );
+    }
+
+    const aiVector3D& PostRotation = PropertyGet<aiVector3D>( props, "PostRotation", ok );
+    if ( ok && PostRotation.SquareLength() > zero_epsilon ) {
+        is_complex = true;
+
+        GetRotationMatrix( rot, PostRotation, chain[ TransformationComp_PostRotation ] );
+    }
+
+    const aiVector3D& RotationPivot = PropertyGet<aiVector3D>( props, "RotationPivot", ok );
+    if ( ok && RotationPivot.SquareLength() > zero_epsilon ) {
+        is_complex = true;
+
+        aiMatrix4x4::Translation( RotationPivot, chain[ TransformationComp_RotationPivot ] );
+        aiMatrix4x4::Translation( -RotationPivot, chain[ TransformationComp_RotationPivotInverse ] );
+    }
+
+    const aiVector3D& RotationOffset = PropertyGet<aiVector3D>( props, "RotationOffset", ok );
+    if ( ok && RotationOffset.SquareLength() > zero_epsilon ) {
+        is_complex = true;
+
+        aiMatrix4x4::Translation( RotationOffset, chain[ TransformationComp_RotationOffset ] );
+    }
+
+    const aiVector3D& ScalingOffset = PropertyGet<aiVector3D>( props, "ScalingOffset", ok );
+    if ( ok && ScalingOffset.SquareLength() > zero_epsilon ) {
+        is_complex = true;
+
+        aiMatrix4x4::Translation( ScalingOffset, chain[ TransformationComp_ScalingOffset ] );
+    }
+
+    const aiVector3D& ScalingPivot = PropertyGet<aiVector3D>( props, "ScalingPivot", ok );
+    if ( ok && ScalingPivot.SquareLength() > zero_epsilon ) {
+        is_complex = true;
+
+        aiMatrix4x4::Translation( ScalingPivot, chain[ TransformationComp_ScalingPivot ] );
+        aiMatrix4x4::Translation( -ScalingPivot, chain[ TransformationComp_ScalingPivotInverse ] );
+    }
+
+    const aiVector3D& Translation = PropertyGet<aiVector3D>( props, "Lcl Translation", ok );
+    if ( ok && Translation.SquareLength() > zero_epsilon ) {
+        aiMatrix4x4::Translation( Translation, chain[ TransformationComp_Translation ] );
+    }
+
+    const aiVector3D& Scaling = PropertyGet<aiVector3D>( props, "Lcl Scaling", ok );
+    if ( ok && std::fabs( Scaling.SquareLength() - 1.0f ) > zero_epsilon ) {
+        aiMatrix4x4::Scaling( Scaling, chain[ TransformationComp_Scaling ] );
+    }
+
+    const aiVector3D& Rotation = PropertyGet<aiVector3D>( props, "Lcl Rotation", ok );
+    if ( ok && Rotation.SquareLength() > zero_epsilon ) {
+        GetRotationMatrix( rot, Rotation, chain[ TransformationComp_Rotation ] );
+    }
+
+    const aiVector3D& GeometricScaling = PropertyGet<aiVector3D>( props, "GeometricScaling", ok );
+    if ( ok && std::fabs( GeometricScaling.SquareLength() - 1.0f ) > zero_epsilon ) {
+        aiMatrix4x4::Scaling( GeometricScaling, chain[ TransformationComp_GeometricScaling ] );
+    }
+
+    const aiVector3D& GeometricRotation = PropertyGet<aiVector3D>( props, "GeometricRotation", ok );
+    if ( ok && GeometricRotation.SquareLength() > zero_epsilon ) {
+        GetRotationMatrix( rot, GeometricRotation, chain[ TransformationComp_GeometricRotation ] );
+    }
+
+    const aiVector3D& GeometricTranslation = PropertyGet<aiVector3D>( props, "GeometricTranslation", ok );
+    if ( ok && GeometricTranslation.SquareLength() > zero_epsilon ) {
+        aiMatrix4x4::Translation( GeometricTranslation, chain[ TransformationComp_GeometricTranslation ] );
+    }
+
+    // is_complex needs to be consistent with NeedsComplexTransformationChain()
+    // or the interplay between this code and the animation converter would
+    // not be guaranteed.
+    ai_assert( NeedsComplexTransformationChain( model ) == is_complex );
+
+    const std::string& name = FixNodeName( model.Name() );
+
+    // now, if we have more than just Translation, Scaling and Rotation,
+    // we need to generate a full node chain to accommodate for assimp's
+    // lack to express pivots and offsets.
+    if ( is_complex && doc.Settings().preservePivots ) {
+        FBXImporter::LogInfo( "generating full transformation chain for node: " + name );
+
+        // query the anim_chain_bits dictionary to find out which chain elements
+        // have associated node animation channels. These can not be dropped
+        // even if they have identity transform in bind pose.
+        NodeAnimBitMap::const_iterator it = node_anim_chain_bits.find( name );
+        const unsigned int anim_chain_bitmask = ( it == node_anim_chain_bits.end() ? 0 : ( *it ).second );
+
+        unsigned int bit = 0x1;
+        for ( size_t i = 0; i < TransformationComp_MAXIMUM; ++i, bit <<= 1 ) {
+            const TransformationComp comp = static_cast<TransformationComp>( i );
+
+            if ( chain[ i ].IsIdentity() && ( anim_chain_bitmask & bit ) == 0 ) {
+                continue;
+            }
+
+            if ( comp == TransformationComp_PostRotation  ) {
+                chain[ i ] = chain[ i ].Inverse();
+            }
+
+            aiNode* nd = new aiNode();
+            output_nodes.push_back( nd );
+
+            nd->mName.Set( NameTransformationChainNode( name, comp ) );
+            nd->mTransformation = chain[ i ];
+        }
+
+        ai_assert( output_nodes.size() );
+        return;
+    }
+
+    // else, we can just multiply the matrices together
+    aiNode* nd = new aiNode();
+    output_nodes.push_back( nd );
+
+    nd->mName.Set( name );
+
+    for (const auto &transform : chain) {
+        nd->mTransformation = nd->mTransformation * transform;
+    }
+}
+
+void Converter::SetupNodeMetadata( const Model& model, aiNode& nd )
+{
+    const PropertyTable& props = model.Props();
+    DirectPropertyMap unparsedProperties = props.GetUnparsedProperties();
+
+    // create metadata on node
+    const std::size_t numStaticMetaData = 2;
+    aiMetadata* data = aiMetadata::Alloc( static_cast<unsigned int>(unparsedProperties.size() + numStaticMetaData) );
+    nd.mMetaData = data;
+    int index = 0;
+
+    // find user defined properties (3ds Max)
+    data->Set( index++, "UserProperties", aiString( PropertyGet<std::string>( props, "UDP3DSMAX", "" ) ) );
+    // preserve the info that a node was marked as Null node in the original file.
+    data->Set( index++, "IsNull", model.IsNull() ? true : false );
+
+    // add unparsed properties to the node's metadata
+    for( const DirectPropertyMap::value_type& prop : unparsedProperties ) {
+        // Interpret the property as a concrete type
+        if ( const TypedProperty<bool>* interpreted = prop.second->As<TypedProperty<bool> >() ) {
+            data->Set( index++, prop.first, interpreted->Value() );
+        } else if ( const TypedProperty<int>* interpreted = prop.second->As<TypedProperty<int> >() ) {
+            data->Set( index++, prop.first, interpreted->Value() );
+        } else if ( const TypedProperty<uint64_t>* interpreted = prop.second->As<TypedProperty<uint64_t> >() ) {
+            data->Set( index++, prop.first, interpreted->Value() );
+        } else if ( const TypedProperty<float>* interpreted = prop.second->As<TypedProperty<float> >() ) {
+            data->Set( index++, prop.first, interpreted->Value() );
+        } else if ( const TypedProperty<std::string>* interpreted = prop.second->As<TypedProperty<std::string> >() ) {
+            data->Set( index++, prop.first, aiString( interpreted->Value() ) );
+        } else if ( const TypedProperty<aiVector3D>* interpreted = prop.second->As<TypedProperty<aiVector3D> >() ) {
+            data->Set( index++, prop.first, interpreted->Value() );
+        } else {
+            ai_assert( false );
+        }
+    }
+}
+
+void Converter::ConvertModel( const Model& model, aiNode& nd, const aiMatrix4x4& node_global_transform )
+{
+    const std::vector<const Geometry*>& geos = model.GetGeometry();
+
+    std::vector<unsigned int> meshes;
+    meshes.reserve( geos.size() );
+
+    for( const Geometry* geo : geos ) {
+
+        const MeshGeometry* const mesh = dynamic_cast< const MeshGeometry* >( geo );
+        if ( mesh ) {
+            const std::vector<unsigned int>& indices = ConvertMesh( *mesh, model, node_global_transform );
+            std::copy( indices.begin(), indices.end(), std::back_inserter( meshes ) );
+        }
+        else {
+            FBXImporter::LogWarn( "ignoring unrecognized geometry: " + geo->Name() );
+        }
+    }
+
+    if ( meshes.size() ) {
+        nd.mMeshes = new unsigned int[ meshes.size() ]();
+        nd.mNumMeshes = static_cast< unsigned int >( meshes.size() );
+
+        std::swap_ranges( meshes.begin(), meshes.end(), nd.mMeshes );
+    }
+}
+
+std::vector<unsigned int> Converter::ConvertMesh( const MeshGeometry& mesh, const Model& model,
+    const aiMatrix4x4& node_global_transform )
+{
+    std::vector<unsigned int> temp;
+
+    MeshMap::const_iterator it = meshes_converted.find( &mesh );
+    if ( it != meshes_converted.end() ) {
+        std::copy( ( *it ).second.begin(), ( *it ).second.end(), std::back_inserter( temp ) );
+        return temp;
+    }
+
+    const std::vector<aiVector3D>& vertices = mesh.GetVertices();
+    const std::vector<unsigned int>& faces = mesh.GetFaceIndexCounts();
+    if ( vertices.empty() || faces.empty() ) {
+        FBXImporter::LogWarn( "ignoring empty geometry: " + mesh.Name() );
+        return temp;
+    }
+
+    // one material per mesh maps easily to aiMesh. Multiple material
+    // meshes need to be split.
+    const MatIndexArray& mindices = mesh.GetMaterialIndices();
+    if ( doc.Settings().readMaterials && !mindices.empty() ) {
+        const MatIndexArray::value_type base = mindices[ 0 ];
+        for( MatIndexArray::value_type index : mindices ) {
+            if ( index != base ) {
+                return ConvertMeshMultiMaterial( mesh, model, node_global_transform );
+            }
+        }
+    }
+
+    // faster code-path, just copy the data
+    temp.push_back( ConvertMeshSingleMaterial( mesh, model, node_global_transform ) );
+    return temp;
+}
+
+aiMesh* Converter::SetupEmptyMesh( const MeshGeometry& mesh )
+{
+    aiMesh* const out_mesh = new aiMesh();
+    meshes.push_back( out_mesh );
+    meshes_converted[ &mesh ].push_back( static_cast<unsigned int>( meshes.size() - 1 ) );
+
+    // set name
+    std::string name = mesh.Name();
+    if ( name.substr( 0, 10 ) == "Geometry::" ) {
+        name = name.substr( 10 );
+    }
+
+    if ( name.length() ) {
+        out_mesh->mName.Set( name );
+    }
+
+    return out_mesh;
+}
+
+unsigned int Converter::ConvertMeshSingleMaterial( const MeshGeometry& mesh, const Model& model,
+    const aiMatrix4x4& node_global_transform )
+{
+    const MatIndexArray& mindices = mesh.GetMaterialIndices();
+    aiMesh* const out_mesh = SetupEmptyMesh( mesh );
+
+    const std::vector<aiVector3D>& vertices = mesh.GetVertices();
+    const std::vector<unsigned int>& faces = mesh.GetFaceIndexCounts();
+
+    // copy vertices
+    out_mesh->mNumVertices = static_cast<unsigned int>( vertices.size() );
+    out_mesh->mVertices = new aiVector3D[ vertices.size() ];
+    std::copy( vertices.begin(), vertices.end(), out_mesh->mVertices );
+
+    // generate dummy faces
+    out_mesh->mNumFaces = static_cast<unsigned int>( faces.size() );
+    aiFace* fac = out_mesh->mFaces = new aiFace[ faces.size() ]();
+
+    unsigned int cursor = 0;
+    for( unsigned int pcount : faces ) {
+        aiFace& f = *fac++;
+        f.mNumIndices = pcount;
+        f.mIndices = new unsigned int[ pcount ];
+        switch ( pcount )
+        {
+        case 1:
+            out_mesh->mPrimitiveTypes |= aiPrimitiveType_POINT;
+            break;
+        case 2:
+            out_mesh->mPrimitiveTypes |= aiPrimitiveType_LINE;
+            break;
+        case 3:
+            out_mesh->mPrimitiveTypes |= aiPrimitiveType_TRIANGLE;
+            break;
+        default:
+            out_mesh->mPrimitiveTypes |= aiPrimitiveType_POLYGON;
+            break;
+        }
+        for ( unsigned int i = 0; i < pcount; ++i ) {
+            f.mIndices[ i ] = cursor++;
+        }
+    }
+
+    // copy normals
+    const std::vector<aiVector3D>& normals = mesh.GetNormals();
+    if ( normals.size() ) {
+        ai_assert( normals.size() == vertices.size() );
+
+        out_mesh->mNormals = new aiVector3D[ vertices.size() ];
+        std::copy( normals.begin(), normals.end(), out_mesh->mNormals );
+    }
+
+    // copy tangents - assimp requires both tangents and bitangents (binormals)
+    // to be present, or neither of them. Compute binormals from normals
+    // and tangents if needed.
+    const std::vector<aiVector3D>& tangents = mesh.GetTangents();
+    const std::vector<aiVector3D>* binormals = &mesh.GetBinormals();
+
+    if ( tangents.size() ) {
+        std::vector<aiVector3D> tempBinormals;
+        if ( !binormals->size() ) {
+            if ( normals.size() ) {
+                tempBinormals.resize( normals.size() );
+                for ( unsigned int i = 0; i < tangents.size(); ++i ) {
+                    tempBinormals[ i ] = normals[ i ] ^ tangents[ i ];
+                }
+
+                binormals = &tempBinormals;
+            }
+            else {
+                binormals = NULL;
+            }
+        }
+
+        if ( binormals ) {
+            ai_assert( tangents.size() == vertices.size() );
+            ai_assert( binormals->size() == vertices.size() );
+
+            out_mesh->mTangents = new aiVector3D[ vertices.size() ];
+            std::copy( tangents.begin(), tangents.end(), out_mesh->mTangents );
+
+            out_mesh->mBitangents = new aiVector3D[ vertices.size() ];
+            std::copy( binormals->begin(), binormals->end(), out_mesh->mBitangents );
+        }
+    }
+
+    // copy texture coords
+    for ( unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i ) {
+        const std::vector<aiVector2D>& uvs = mesh.GetTextureCoords( i );
+        if ( uvs.empty() ) {
+            break;
+        }
+
+        aiVector3D* out_uv = out_mesh->mTextureCoords[ i ] = new aiVector3D[ vertices.size() ];
+        for( const aiVector2D& v : uvs ) {
+            *out_uv++ = aiVector3D( v.x, v.y, 0.0f );
+        }
+
+        out_mesh->mNumUVComponents[ i ] = 2;
+    }
+
+    // copy vertex colors
+    for ( unsigned int i = 0; i < AI_MAX_NUMBER_OF_COLOR_SETS; ++i ) {
+        const std::vector<aiColor4D>& colors = mesh.GetVertexColors( i );
+        if ( colors.empty() ) {
+            break;
+        }
+
+        out_mesh->mColors[ i ] = new aiColor4D[ vertices.size() ];
+        std::copy( colors.begin(), colors.end(), out_mesh->mColors[ i ] );
+    }
+
+    if ( !doc.Settings().readMaterials || mindices.empty() ) {
+        FBXImporter::LogError( "no material assigned to mesh, setting default material" );
+        out_mesh->mMaterialIndex = GetDefaultMaterial();
+    }
+    else {
+        ConvertMaterialForMesh( out_mesh, model, mesh, mindices[ 0 ] );
+    }
+
+    if ( doc.Settings().readWeights && mesh.DeformerSkin() != NULL ) {
+        ConvertWeights( out_mesh, model, mesh, node_global_transform, NO_MATERIAL_SEPARATION );
+    }
+
+    return static_cast<unsigned int>( meshes.size() - 1 );
+}
+
+std::vector<unsigned int> Converter::ConvertMeshMultiMaterial( const MeshGeometry& mesh, const Model& model,
+    const aiMatrix4x4& node_global_transform )
+{
+    const MatIndexArray& mindices = mesh.GetMaterialIndices();
+    ai_assert( mindices.size() );
+
+    std::set<MatIndexArray::value_type> had;
+    std::vector<unsigned int> indices;
+
+    for( MatIndexArray::value_type index : mindices ) {
+        if ( had.find( index ) == had.end() ) {
+
+            indices.push_back( ConvertMeshMultiMaterial( mesh, model, index, node_global_transform ) );
+            had.insert( index );
+        }
+    }
+
+    return indices;
+}
+
+unsigned int Converter::ConvertMeshMultiMaterial( const MeshGeometry& mesh, const Model& model,
+    MatIndexArray::value_type index,
+    const aiMatrix4x4& node_global_transform )
+{
+    aiMesh* const out_mesh = SetupEmptyMesh( mesh );
+
+    const MatIndexArray& mindices = mesh.GetMaterialIndices();
+    const std::vector<aiVector3D>& vertices = mesh.GetVertices();
+    const std::vector<unsigned int>& faces = mesh.GetFaceIndexCounts();
+
+    const bool process_weights = doc.Settings().readWeights && mesh.DeformerSkin() != NULL;
+
+    unsigned int count_faces = 0;
+    unsigned int count_vertices = 0;
+
+    // count faces
+    std::vector<unsigned int>::const_iterator itf = faces.begin();
+    for ( MatIndexArray::const_iterator it = mindices.begin(),
+        end = mindices.end(); it != end; ++it, ++itf )
+    {
+        if ( ( *it ) != index ) {
+            continue;
+        }
+        ++count_faces;
+        count_vertices += *itf;
+    }
+
+    ai_assert( count_faces );
+    ai_assert( count_vertices );
+
+    // mapping from output indices to DOM indexing, needed to resolve weights
+    std::vector<unsigned int> reverseMapping;
+
+    if ( process_weights ) {
+        reverseMapping.resize( count_vertices );
+    }
+
+    // allocate output data arrays, but don't fill them yet
+    out_mesh->mNumVertices = count_vertices;
+    out_mesh->mVertices = new aiVector3D[ count_vertices ];
+
+    out_mesh->mNumFaces = count_faces;
+    aiFace* fac = out_mesh->mFaces = new aiFace[ count_faces ]();
+
+
+    // allocate normals
+    const std::vector<aiVector3D>& normals = mesh.GetNormals();
+    if ( normals.size() ) {
+        ai_assert( normals.size() == vertices.size() );
+        out_mesh->mNormals = new aiVector3D[ vertices.size() ];
+    }
+
+    // allocate tangents, binormals.
+    const std::vector<aiVector3D>& tangents = mesh.GetTangents();
+    const std::vector<aiVector3D>* binormals = &mesh.GetBinormals();
+    std::vector<aiVector3D> tempBinormals;
+
+    if ( tangents.size() ) {
+        if ( !binormals->size() ) {
+            if ( normals.size() ) {
+                // XXX this computes the binormals for the entire mesh, not only
+                // the part for which we need them.
+                tempBinormals.resize( normals.size() );
+                for ( unsigned int i = 0; i < tangents.size(); ++i ) {
+                    tempBinormals[ i ] = normals[ i ] ^ tangents[ i ];
+                }
+
+                binormals = &tempBinormals;
+            }
+            else {
+                binormals = NULL;
+            }
+        }
+
+        if ( binormals ) {
+            ai_assert( tangents.size() == vertices.size() && binormals->size() == vertices.size() );
+
+            out_mesh->mTangents = new aiVector3D[ vertices.size() ];
+            out_mesh->mBitangents = new aiVector3D[ vertices.size() ];
+        }
+    }
+
+    // allocate texture coords
+    unsigned int num_uvs = 0;
+    for ( unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i, ++num_uvs ) {
+        const std::vector<aiVector2D>& uvs = mesh.GetTextureCoords( i );
+        if ( uvs.empty() ) {
+            break;
+        }
+
+        out_mesh->mTextureCoords[ i ] = new aiVector3D[ vertices.size() ];
+        out_mesh->mNumUVComponents[ i ] = 2;
+    }
+
+    // allocate vertex colors
+    unsigned int num_vcs = 0;
+    for ( unsigned int i = 0; i < AI_MAX_NUMBER_OF_COLOR_SETS; ++i, ++num_vcs ) {
+        const std::vector<aiColor4D>& colors = mesh.GetVertexColors( i );
+        if ( colors.empty() ) {
+            break;
+        }
+
+        out_mesh->mColors[ i ] = new aiColor4D[ vertices.size() ];
+    }
+
+    unsigned int cursor = 0, in_cursor = 0;
+
+    itf = faces.begin();
+    for ( MatIndexArray::const_iterator it = mindices.begin(),
+        end = mindices.end(); it != end; ++it, ++itf )
+    {
+        const unsigned int pcount = *itf;
+        if ( ( *it ) != index ) {
+            in_cursor += pcount;
+            continue;
+        }
+
+        aiFace& f = *fac++;
+
+        f.mNumIndices = pcount;
+        f.mIndices = new unsigned int[ pcount ];
+        switch ( pcount )
+        {
+        case 1:
+            out_mesh->mPrimitiveTypes |= aiPrimitiveType_POINT;
+            break;
+        case 2:
+            out_mesh->mPrimitiveTypes |= aiPrimitiveType_LINE;
+            break;
+        case 3:
+            out_mesh->mPrimitiveTypes |= aiPrimitiveType_TRIANGLE;
+            break;
+        default:
+            out_mesh->mPrimitiveTypes |= aiPrimitiveType_POLYGON;
+            break;
+        }
+        for ( unsigned int i = 0; i < pcount; ++i, ++cursor, ++in_cursor ) {
+            f.mIndices[ i ] = cursor;
+
+            if ( reverseMapping.size() ) {
+                reverseMapping[ cursor ] = in_cursor;
+            }
+
+            out_mesh->mVertices[ cursor ] = vertices[ in_cursor ];
+
+            if ( out_mesh->mNormals ) {
+                out_mesh->mNormals[ cursor ] = normals[ in_cursor ];
+            }
+
+            if ( out_mesh->mTangents ) {
+                out_mesh->mTangents[ cursor ] = tangents[ in_cursor ];
+                out_mesh->mBitangents[ cursor ] = ( *binormals )[ in_cursor ];
+            }
+
+            for ( unsigned int i = 0; i < num_uvs; ++i ) {
+                const std::vector<aiVector2D>& uvs = mesh.GetTextureCoords( i );
+                out_mesh->mTextureCoords[ i ][ cursor ] = aiVector3D( uvs[ in_cursor ].x, uvs[ in_cursor ].y, 0.0f );
+            }
+
+            for ( unsigned int i = 0; i < num_vcs; ++i ) {
+                const std::vector<aiColor4D>& cols = mesh.GetVertexColors( i );
+                out_mesh->mColors[ i ][ cursor ] = cols[ in_cursor ];
+            }
+        }
+    }
+
+    ConvertMaterialForMesh( out_mesh, model, mesh, index );
+
+    if ( process_weights ) {
+        ConvertWeights( out_mesh, model, mesh, node_global_transform, index, &reverseMapping );
+    }
+
+    return static_cast<unsigned int>( meshes.size() - 1 );
+}
+
+void Converter::ConvertWeights( aiMesh* out, const Model& model, const MeshGeometry& geo,
+    const aiMatrix4x4& node_global_transform ,
+    unsigned int materialIndex,
+    std::vector<unsigned int>* outputVertStartIndices  )
+{
+    ai_assert( geo.DeformerSkin() );
+
+    std::vector<size_t> out_indices;
+    std::vector<size_t> index_out_indices;
+    std::vector<size_t> count_out_indices;
+
+    const Skin& sk = *geo.DeformerSkin();
+
+    std::vector<aiBone*> bones;
+    bones.reserve( sk.Clusters().size() );
+
+    const bool no_mat_check = materialIndex == NO_MATERIAL_SEPARATION;
+    ai_assert( no_mat_check || outputVertStartIndices );
+
+    try {
+
+        for( const Cluster* cluster : sk.Clusters() ) {
+            ai_assert( cluster );
+
+            const WeightIndexArray& indices = cluster->GetIndices();
+
+            if ( indices.empty() ) {
+                continue;
+            }
+
+            const MatIndexArray& mats = geo.GetMaterialIndices();
+
+            bool ok = false;
+
+            const size_t no_index_sentinel = std::numeric_limits<size_t>::max();
+
+            count_out_indices.clear();
+            index_out_indices.clear();
+            out_indices.clear();
+
+            // now check if *any* of these weights is contained in the output mesh,
+            // taking notes so we don't need to do it twice.
+            for( WeightIndexArray::value_type index : indices ) {
+
+                unsigned int count = 0;
+                const unsigned int* const out_idx = geo.ToOutputVertexIndex( index, count );
+                // ToOutputVertexIndex only returns NULL if index is out of bounds
+                // which should never happen
+                ai_assert( out_idx != NULL );
+
+                index_out_indices.push_back( no_index_sentinel );
+                count_out_indices.push_back( 0 );
+
+                for ( unsigned int i = 0; i < count; ++i ) {
+                    if ( no_mat_check || static_cast<size_t>( mats[ geo.FaceForVertexIndex( out_idx[ i ] ) ] ) == materialIndex ) {
+
+                        if ( index_out_indices.back() == no_index_sentinel ) {
+                            index_out_indices.back() = out_indices.size();
+
+                        }
+
+                        if ( no_mat_check ) {
+                            out_indices.push_back( out_idx[ i ] );
+                        }
+                        else {
+                            // this extra lookup is in O(logn), so the entire algorithm becomes O(nlogn)
+                            const std::vector<unsigned int>::iterator it = std::lower_bound(
+                                outputVertStartIndices->begin(),
+                                outputVertStartIndices->end(),
+                                out_idx[ i ]
+                                );
+
+                            out_indices.push_back( std::distance( outputVertStartIndices->begin(), it ) );
+                        }
+
+                        ++count_out_indices.back();
+                        ok = true;
+                    }
+                }
+            }
+
+            // if we found at least one, generate the output bones
+            // XXX this could be heavily simplified by collecting the bone
+            // data in a single step.
+            if ( ok ) {
+                ConvertCluster( bones, model, *cluster, out_indices, index_out_indices,
+                    count_out_indices, node_global_transform );
+            }
+        }
+    }
+    catch ( std::exception& ) {
+        std::for_each( bones.begin(), bones.end(), Util::delete_fun<aiBone>() );
+        throw;
+    }
+
+    if ( bones.empty() ) {
+        return;
+    }
+
+    out->mBones = new aiBone*[ bones.size() ]();
+    out->mNumBones = static_cast<unsigned int>( bones.size() );
+
+    std::swap_ranges( bones.begin(), bones.end(), out->mBones );
+}
+
+void Converter::ConvertCluster( std::vector<aiBone*>& bones, const Model& /*model*/, const Cluster& cl,
+        std::vector<size_t>& out_indices,
+        std::vector<size_t>& index_out_indices,
+        std::vector<size_t>& count_out_indices,
+        const aiMatrix4x4& node_global_transform )
+{
+
+    aiBone* const bone = new aiBone();
+    bones.push_back( bone );
+
+    bone->mName = FixNodeName( cl.TargetNode()->Name() );
+
+    bone->mOffsetMatrix = cl.TransformLink();
+    bone->mOffsetMatrix.Inverse();
+
+    bone->mOffsetMatrix = bone->mOffsetMatrix * node_global_transform;
+
+    bone->mNumWeights = static_cast<unsigned int>( out_indices.size() );
+    aiVertexWeight* cursor = bone->mWeights = new aiVertexWeight[ out_indices.size() ];
+
+    const size_t no_index_sentinel = std::numeric_limits<size_t>::max();
+    const WeightArray& weights = cl.GetWeights();
+
+    const size_t c = index_out_indices.size();
+    for ( size_t i = 0; i < c; ++i ) {
+        const size_t index_index = index_out_indices[ i ];
+
+        if ( index_index == no_index_sentinel ) {
+            continue;
+        }
+
+        const size_t cc = count_out_indices[ i ];
+        for ( size_t j = 0; j < cc; ++j ) {
+            aiVertexWeight& out_weight = *cursor++;
+
+            out_weight.mVertexId = static_cast<unsigned int>( out_indices[ index_index + j ] );
+            out_weight.mWeight = weights[ i ];
+        }
+    }
+}
+
+void Converter::ConvertMaterialForMesh( aiMesh* out, const Model& model, const MeshGeometry& geo,
+    MatIndexArray::value_type materialIndex )
+{
+    // locate source materials for this mesh
+    const std::vector<const Material*>& mats = model.GetMaterials();
+    if ( static_cast<unsigned int>( materialIndex ) >= mats.size() || materialIndex < 0 ) {
+        FBXImporter::LogError( "material index out of bounds, setting default material" );
+        out->mMaterialIndex = GetDefaultMaterial();
+        return;
+    }
+
+    const Material* const mat = mats[ materialIndex ];
+    MaterialMap::const_iterator it = materials_converted.find( mat );
+    if ( it != materials_converted.end() ) {
+        out->mMaterialIndex = ( *it ).second;
+        return;
+    }
+
+    out->mMaterialIndex = ConvertMaterial( *mat, &geo );
+    materials_converted[ mat ] = out->mMaterialIndex;
+}
+
+unsigned int Converter::GetDefaultMaterial()
+{
+    if ( defaultMaterialIndex ) {
+        return defaultMaterialIndex - 1;
+    }
+
+    aiMaterial* out_mat = new aiMaterial();
+    materials.push_back( out_mat );
+
+    const aiColor3D diffuse = aiColor3D( 0.8f, 0.8f, 0.8f );
+    out_mat->AddProperty( &diffuse, 1, AI_MATKEY_COLOR_DIFFUSE );
+
+    aiString s;
+    s.Set( AI_DEFAULT_MATERIAL_NAME );
+
+    out_mat->AddProperty( &s, AI_MATKEY_NAME );
+
+    defaultMaterialIndex = static_cast< unsigned int >( materials.size() );
+    return defaultMaterialIndex - 1;
+}
+
+
+unsigned int Converter::ConvertMaterial( const Material& material, const MeshGeometry* const mesh )
+{
+    const PropertyTable& props = material.Props();
+
+    // generate empty output material
+    aiMaterial* out_mat = new aiMaterial();
+    materials_converted[ &material ] = static_cast<unsigned int>( materials.size() );
+
+    materials.push_back( out_mat );
+
+    aiString str;
+
+    // stip Material:: prefix
+    std::string name = material.Name();
+    if ( name.substr( 0, 10 ) == "Material::" ) {
+        name = name.substr( 10 );
+    }
+
+    // set material name if not empty - this could happen
+    // and there should be no key for it in this case.
+    if ( name.length() ) {
+        str.Set( name );
+        out_mat->AddProperty( &str, AI_MATKEY_NAME );
+    }
+
+    // shading stuff and colors
+    SetShadingPropertiesCommon( out_mat, props );
+
+    // texture assignments
+    SetTextureProperties( out_mat, material.Textures(), mesh );
+    SetTextureProperties( out_mat, material.LayeredTextures(), mesh );
+
+    return static_cast<unsigned int>( materials.size() - 1 );
+}
+
+unsigned int Converter::ConvertVideo( const Video& video )
+{
+    // generate empty output texture
+    aiTexture* out_tex = new aiTexture();
+    textures.push_back( out_tex );
+
+    // assuming the texture is compressed
+    out_tex->mWidth = static_cast<unsigned int>( video.ContentLength() ); // total data size
+    out_tex->mHeight = 0; // fixed to 0
+
+    // steal the data from the Video to avoid an additional copy
+    out_tex->pcData = reinterpret_cast<aiTexel*>( const_cast<Video&>( video ).RelinquishContent() );
+
+    // try to extract a hint from the file extension
+    const std::string& filename = video.FileName().empty() ? video.RelativeFilename() : video.FileName();
+    std::string ext = BaseImporter::GetExtension( filename );
+
+    if ( ext == "jpeg" ) {
+        ext = "jpg";
+    }
+
+    if ( ext.size() <= 3 ) {
+        memcpy( out_tex->achFormatHint, ext.c_str(), ext.size() );
+    }
+
+    return static_cast<unsigned int>( textures.size() - 1 );
+}
+
+void Converter::TrySetTextureProperties( aiMaterial* out_mat, const TextureMap& textures,
+    const std::string& propName,
+    aiTextureType target, const MeshGeometry* const mesh )
+{
+    TextureMap::const_iterator it = textures.find( propName );
+    if ( it == textures.end() ) {
+        return;
+    }
+
+    const Texture* const tex = ( *it ).second;
+    if ( tex != 0 )
+    {
+        aiString path;
+        path.Set( tex->RelativeFilename() );
+
+        const Video* media = tex->Media();
+        if (media != 0) {
+			bool textureReady = false; //tells if our texture is ready (if it was loaded or if it was found)
+			unsigned int index;
+
+			VideoMap::const_iterator it = textures_converted.find(media);
+			if (it != textures_converted.end()) {
+				index = (*it).second;
+				textureReady = true;
+			}
+			else {
+				if (media->ContentLength() > 0) {
+					index = ConvertVideo(*media);
+					textures_converted[media] = index;
+					textureReady = true;
+				}
+				else if (doc.Settings().searchEmbeddedTextures) { //try to find the texture on the already-loaded textures by the filename, if the flag is on					
+					textureReady = FindTextureIndexByFilename(*media, index);
+				}
+			}
+
+			// setup texture reference string (copied from ColladaLoader::FindFilenameForEffectTexture), if the texture is ready
+			if (textureReady) {
+				path.data[0] = '*';
+				path.length = 1 + ASSIMP_itoa10(path.data + 1, MAXLEN - 1, index);
+			}
+		}  
+
+        out_mat->AddProperty( &path, _AI_MATKEY_TEXTURE_BASE, target, 0 );
+
+        aiUVTransform uvTrafo;
+        // XXX handle all kinds of UV transformations
+        uvTrafo.mScaling = tex->UVScaling();
+        uvTrafo.mTranslation = tex->UVTranslation();
+        out_mat->AddProperty( &uvTrafo, 1, _AI_MATKEY_UVTRANSFORM_BASE, target, 0 );
+
+        const PropertyTable& props = tex->Props();
+
+        int uvIndex = 0;
+
+        bool ok;
+        const std::string& uvSet = PropertyGet<std::string>( props, "UVSet", ok );
+        if ( ok ) {
+            // "default" is the name which usually appears in the FbxFileTexture template
+            if ( uvSet != "default" && uvSet.length() ) {
+                // this is a bit awkward - we need to find a mesh that uses this
+                // material and scan its UV channels for the given UV name because
+                // assimp references UV channels by index, not by name.
+
+                // XXX: the case that UV channels may appear in different orders
+                // in meshes is unhandled. A possible solution would be to sort
+                // the UV channels alphabetically, but this would have the side
+                // effect that the primary (first) UV channel would sometimes
+                // be moved, causing trouble when users read only the first
+                // UV channel and ignore UV channel assignments altogether.
+
+                const unsigned int matIndex = static_cast<unsigned int>( std::distance( materials.begin(),
+                    std::find( materials.begin(), materials.end(), out_mat )
+                    ) );
+
+
+                uvIndex = -1;
+                if ( !mesh )
+                {
+                    for( const MeshMap::value_type& v : meshes_converted ) {
+                        const MeshGeometry* const mesh = dynamic_cast<const MeshGeometry*> ( v.first );
+                        if ( !mesh ) {
+                            continue;
+                        }
+
+                        const MatIndexArray& mats = mesh->GetMaterialIndices();
+                        if ( std::find( mats.begin(), mats.end(), matIndex ) == mats.end() ) {
+                            continue;
+                        }
+
+                        int index = -1;
+                        for ( unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i ) {
+                            if ( mesh->GetTextureCoords( i ).empty() ) {
+                                break;
+                            }
+                            const std::string& name = mesh->GetTextureCoordChannelName( i );
+                            if ( name == uvSet ) {
+                                index = static_cast<int>( i );
+                                break;
+                            }
+                        }
+                        if ( index == -1 ) {
+                            FBXImporter::LogWarn( "did not find UV channel named " + uvSet + " in a mesh using this material" );
+                            continue;
+                        }
+
+                        if ( uvIndex == -1 ) {
+                            uvIndex = index;
+                        }
+                        else {
+                            FBXImporter::LogWarn( "the UV channel named " + uvSet +
+                                " appears at different positions in meshes, results will be wrong" );
+                        }
+                    }
+                }
+                else
+                {
+                    int index = -1;
+                    for ( unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i ) {
+                        if ( mesh->GetTextureCoords( i ).empty() ) {
+                            break;
+                        }
+                        const std::string& name = mesh->GetTextureCoordChannelName( i );
+                        if ( name == uvSet ) {
+                            index = static_cast<int>( i );
+                            break;
+                        }
+                    }
+                    if ( index == -1 ) {
+                        FBXImporter::LogWarn( "did not find UV channel named " + uvSet + " in a mesh using this material" );
+                    }
+
+                    if ( uvIndex == -1 ) {
+                        uvIndex = index;
+                    }
+                }
+
+                if ( uvIndex == -1 ) {
+                    FBXImporter::LogWarn( "failed to resolve UV channel " + uvSet + ", using first UV channel" );
+                    uvIndex = 0;
+                }
+            }
+        }
+
+        out_mat->AddProperty( &uvIndex, 1, _AI_MATKEY_UVWSRC_BASE, target, 0 );
+    }
+}
+
+void Converter::TrySetTextureProperties( aiMaterial* out_mat, const LayeredTextureMap& layeredTextures,
+    const std::string& propName,
+    aiTextureType target, const MeshGeometry* const mesh )
+{
+    LayeredTextureMap::const_iterator it = layeredTextures.find( propName );
+    if ( it == layeredTextures.end() ) {
+        return;
+    }
+
+    int texCount = (*it).second->textureCount();
+    
+    // Set the blend mode for layered textures
+	int blendmode= (*it).second->GetBlendMode();
+	out_mat->AddProperty(&blendmode,1,_AI_MATKEY_TEXOP_BASE,target,0);
+
+	for(int texIndex = 0; texIndex < texCount; texIndex++){
+    
+        const Texture* const tex = ( *it ).second->getTexture(texIndex);
+
+        aiString path;
+        path.Set( tex->RelativeFilename() );
+
+        out_mat->AddProperty( &path, _AI_MATKEY_TEXTURE_BASE, target, texIndex );
+
+        aiUVTransform uvTrafo;
+        // XXX handle all kinds of UV transformations
+        uvTrafo.mScaling = tex->UVScaling();
+        uvTrafo.mTranslation = tex->UVTranslation();
+        out_mat->AddProperty( &uvTrafo, 1, _AI_MATKEY_UVTRANSFORM_BASE, target, texIndex );
+
+        const PropertyTable& props = tex->Props();
+
+        int uvIndex = 0;
+
+        bool ok;
+        const std::string& uvSet = PropertyGet<std::string>( props, "UVSet", ok );
+        if ( ok ) {
+            // "default" is the name which usually appears in the FbxFileTexture template
+            if ( uvSet != "default" && uvSet.length() ) {
+                // this is a bit awkward - we need to find a mesh that uses this
+                // material and scan its UV channels for the given UV name because
+                // assimp references UV channels by index, not by name.
+
+                // XXX: the case that UV channels may appear in different orders
+                // in meshes is unhandled. A possible solution would be to sort
+                // the UV channels alphabetically, but this would have the side
+                // effect that the primary (first) UV channel would sometimes
+                // be moved, causing trouble when users read only the first
+                // UV channel and ignore UV channel assignments altogether.
+
+                const unsigned int matIndex = static_cast<unsigned int>( std::distance( materials.begin(),
+                    std::find( materials.begin(), materials.end(), out_mat )
+                    ) );
+
+                uvIndex = -1;
+                if ( !mesh )
+                {
+                    for( const MeshMap::value_type& v : meshes_converted ) {
+                        const MeshGeometry* const mesh = dynamic_cast<const MeshGeometry*> ( v.first );
+                        if ( !mesh ) {
+                            continue;
+                        }
+
+                        const MatIndexArray& mats = mesh->GetMaterialIndices();
+                        if ( std::find( mats.begin(), mats.end(), matIndex ) == mats.end() ) {
+                            continue;
+                        }
+
+                        int index = -1;
+                        for ( unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i ) {
+                            if ( mesh->GetTextureCoords( i ).empty() ) {
+                                break;
+                            }
+                            const std::string& name = mesh->GetTextureCoordChannelName( i );
+                            if ( name == uvSet ) {
+                                index = static_cast<int>( i );
+                                break;
+                            }
+                        }
+                        if ( index == -1 ) {
+                            FBXImporter::LogWarn( "did not find UV channel named " + uvSet + " in a mesh using this material" );
+                            continue;
+                        }
+
+                        if ( uvIndex == -1 ) {
+                            uvIndex = index;
+                        }
+                        else {
+                            FBXImporter::LogWarn( "the UV channel named " + uvSet +
+                                " appears at different positions in meshes, results will be wrong" );
+                        }
+                    }
+                }
+                else
+                {
+                    int index = -1;
+                    for ( unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i ) {
+                        if ( mesh->GetTextureCoords( i ).empty() ) {
+                            break;
+                        }
+                        const std::string& name = mesh->GetTextureCoordChannelName( i );
+                        if ( name == uvSet ) {
+                            index = static_cast<int>( i );
+                            break;
+                        }
+                    }
+                    if ( index == -1 ) {
+                        FBXImporter::LogWarn( "did not find UV channel named " + uvSet + " in a mesh using this material" );
+                    }
+
+                    if ( uvIndex == -1 ) {
+                        uvIndex = index;
+                    }
+                }
+
+                if ( uvIndex == -1 ) {
+                    FBXImporter::LogWarn( "failed to resolve UV channel " + uvSet + ", using first UV channel" );
+                    uvIndex = 0;
+                }
+            }
+        }
+
+        out_mat->AddProperty( &uvIndex, 1, _AI_MATKEY_UVWSRC_BASE, target, texIndex );
+    }
+}
+
+void Converter::SetTextureProperties( aiMaterial* out_mat, const TextureMap& textures, const MeshGeometry* const mesh )
+{
+    TrySetTextureProperties( out_mat, textures, "DiffuseColor", aiTextureType_DIFFUSE, mesh );
+    TrySetTextureProperties( out_mat, textures, "AmbientColor", aiTextureType_AMBIENT, mesh );
+    TrySetTextureProperties( out_mat, textures, "EmissiveColor", aiTextureType_EMISSIVE, mesh );
+    TrySetTextureProperties( out_mat, textures, "SpecularColor", aiTextureType_SPECULAR, mesh );
+    TrySetTextureProperties( out_mat, textures, "SpecularFactor", aiTextureType_SPECULAR, mesh);
+    TrySetTextureProperties( out_mat, textures, "TransparentColor", aiTextureType_OPACITY, mesh );
+    TrySetTextureProperties( out_mat, textures, "ReflectionColor", aiTextureType_REFLECTION, mesh );
+    TrySetTextureProperties( out_mat, textures, "DisplacementColor", aiTextureType_DISPLACEMENT, mesh );
+    TrySetTextureProperties( out_mat, textures, "NormalMap", aiTextureType_NORMALS, mesh );
+    TrySetTextureProperties( out_mat, textures, "Bump", aiTextureType_HEIGHT, mesh );
+    TrySetTextureProperties( out_mat, textures, "ShininessExponent", aiTextureType_SHININESS, mesh );
+}
+
+void Converter::SetTextureProperties( aiMaterial* out_mat, const LayeredTextureMap& layeredTextures, const MeshGeometry* const mesh )
+{
+    TrySetTextureProperties( out_mat, layeredTextures, "DiffuseColor", aiTextureType_DIFFUSE, mesh );
+    TrySetTextureProperties( out_mat, layeredTextures, "AmbientColor", aiTextureType_AMBIENT, mesh );
+    TrySetTextureProperties( out_mat, layeredTextures, "EmissiveColor", aiTextureType_EMISSIVE, mesh );
+    TrySetTextureProperties( out_mat, layeredTextures, "SpecularColor", aiTextureType_SPECULAR, mesh );
+    TrySetTextureProperties( out_mat, layeredTextures, "SpecularFactor", aiTextureType_SPECULAR, mesh);
+    TrySetTextureProperties( out_mat, layeredTextures, "TransparentColor", aiTextureType_OPACITY, mesh );
+    TrySetTextureProperties( out_mat, layeredTextures, "ReflectionColor", aiTextureType_REFLECTION, mesh );
+    TrySetTextureProperties( out_mat, layeredTextures, "DisplacementColor", aiTextureType_DISPLACEMENT, mesh );
+    TrySetTextureProperties( out_mat, layeredTextures, "NormalMap", aiTextureType_NORMALS, mesh );
+    TrySetTextureProperties( out_mat, layeredTextures, "Bump", aiTextureType_HEIGHT, mesh );
+    TrySetTextureProperties( out_mat, layeredTextures, "ShininessExponent", aiTextureType_SHININESS, mesh );
+}
+
+aiColor3D Converter::GetColorPropertyFromMaterial( const PropertyTable& props, const std::string& baseName,
+    bool& result )
+{
+    result = true;
+
+    bool ok;
+    const aiVector3D& Diffuse = PropertyGet<aiVector3D>( props, baseName, ok );
+    if ( ok ) {
+        return aiColor3D( Diffuse.x, Diffuse.y, Diffuse.z );
+    }
+    else {
+        aiVector3D DiffuseColor = PropertyGet<aiVector3D>( props, baseName + "Color", ok );
+        if ( ok ) {
+            float DiffuseFactor = PropertyGet<float>( props, baseName + "Factor", ok );
+            if ( ok ) {
+                DiffuseColor *= DiffuseFactor;
+            }
+
+            return aiColor3D( DiffuseColor.x, DiffuseColor.y, DiffuseColor.z );
+        }
+    }
+    result = false;
+    return aiColor3D( 0.0f, 0.0f, 0.0f );
+}
+
+
+void Converter::SetShadingPropertiesCommon( aiMaterial* out_mat, const PropertyTable& props )
+{
+    // set shading properties. There are various, redundant ways in which FBX materials
+    // specify their shading settings (depending on shading models, prop
+    // template etc.). No idea which one is right in a particular context.
+    // Just try to make sense of it - there's no spec to verify this against,
+    // so why should we.
+    bool ok;
+    const aiColor3D& Diffuse = GetColorPropertyFromMaterial( props, "Diffuse", ok );
+    if ( ok ) {
+        out_mat->AddProperty( &Diffuse, 1, AI_MATKEY_COLOR_DIFFUSE );
+    }
+
+    const aiColor3D& Emissive = GetColorPropertyFromMaterial( props, "Emissive", ok );
+    if ( ok ) {
+        out_mat->AddProperty( &Emissive, 1, AI_MATKEY_COLOR_EMISSIVE );
+    }
+
+    const aiColor3D& Ambient = GetColorPropertyFromMaterial( props, "Ambient", ok );
+    if ( ok ) {
+        out_mat->AddProperty( &Ambient, 1, AI_MATKEY_COLOR_AMBIENT );
+    }
+
+    const aiColor3D& Specular = GetColorPropertyFromMaterial( props, "Specular", ok );
+    if ( ok ) {
+        out_mat->AddProperty( &Specular, 1, AI_MATKEY_COLOR_SPECULAR );
+    }
+
+    const float Opacity = PropertyGet<float>( props, "Opacity", ok );
+    if ( ok ) {
+        out_mat->AddProperty( &Opacity, 1, AI_MATKEY_OPACITY );
+    }
+
+    const float Reflectivity = PropertyGet<float>( props, "Reflectivity", ok );
+    if ( ok ) {
+        out_mat->AddProperty( &Reflectivity, 1, AI_MATKEY_REFLECTIVITY );
+    }
+
+    const float Shininess = PropertyGet<float>( props, "Shininess", ok );
+    if ( ok ) {
+        out_mat->AddProperty( &Shininess, 1, AI_MATKEY_SHININESS_STRENGTH );
+    }
+
+    const float ShininessExponent = PropertyGet<float>( props, "ShininessExponent", ok );
+    if ( ok ) {
+        out_mat->AddProperty( &ShininessExponent, 1, AI_MATKEY_SHININESS );
+    }
+
+    const float BumpFactor = PropertyGet<float>(props, "BumpFactor", ok);
+    if (ok) {
+        out_mat->AddProperty(&BumpFactor, 1, AI_MATKEY_BUMPSCALING);
+    }
+
+    const float DispFactor = PropertyGet<float>(props, "DisplacementFactor", ok);
+    if (ok) {
+        out_mat->AddProperty(&DispFactor, 1, "$mat.displacementscaling", 0, 0);
+    }
+}
+
+
+double Converter::FrameRateToDouble( FileGlobalSettings::FrameRate fp, double customFPSVal )
+{
+    switch ( fp ) {
+    case FileGlobalSettings::FrameRate_DEFAULT:
+        return 1.0;
+
+    case FileGlobalSettings::FrameRate_120:
+        return 120.0;
+
+    case FileGlobalSettings::FrameRate_100:
+        return 100.0;
+
+    case FileGlobalSettings::FrameRate_60:
+        return 60.0;
+
+    case FileGlobalSettings::FrameRate_50:
+        return 50.0;
+
+    case FileGlobalSettings::FrameRate_48:
+        return 48.0;
+
+    case FileGlobalSettings::FrameRate_30:
+    case FileGlobalSettings::FrameRate_30_DROP:
+        return 30.0;
+
+    case FileGlobalSettings::FrameRate_NTSC_DROP_FRAME:
+    case FileGlobalSettings::FrameRate_NTSC_FULL_FRAME:
+        return 29.9700262;
+
+    case FileGlobalSettings::FrameRate_PAL:
+        return 25.0;
+
+    case FileGlobalSettings::FrameRate_CINEMA:
+        return 24.0;
+
+    case FileGlobalSettings::FrameRate_1000:
+        return 1000.0;
+
+    case FileGlobalSettings::FrameRate_CINEMA_ND:
+        return 23.976;
+
+    case FileGlobalSettings::FrameRate_CUSTOM:
+        return customFPSVal;
+
+    case FileGlobalSettings::FrameRate_MAX: // this is to silence compiler warnings
+        break;
+    }
+
+    ai_assert( false );
+    return -1.0f;
+}
+
+
+void Converter::ConvertAnimations()
+{
+    // first of all determine framerate
+    const FileGlobalSettings::FrameRate fps = doc.GlobalSettings().TimeMode();
+    const float custom = doc.GlobalSettings().CustomFrameRate();
+    anim_fps = FrameRateToDouble( fps, custom );
+
+    const std::vector<const AnimationStack*>& animations = doc.AnimationStacks();
+    for( const AnimationStack* stack : animations ) {
+        ConvertAnimationStack( *stack );
+    }
+}
+
+void Converter::RenameNode( const std::string& fixed_name, const std::string& new_name ) {
+    if ( node_names.find( fixed_name ) == node_names.end() ) {
+        FBXImporter::LogError( "Cannot rename node " + fixed_name + ", not existing.");
+        return;
+    }
+
+    if ( node_names.find( new_name ) != node_names.end() ) {
+        FBXImporter::LogError( "Cannot rename node " + fixed_name + " to " + new_name +", name already existing." );
+        return;
+    }
+
+    ai_assert( node_names.find( fixed_name ) != node_names.end() );
+    ai_assert( node_names.find( new_name ) == node_names.end() );
+
+    renamed_nodes[ fixed_name ] = new_name;
+
+    const aiString fn( fixed_name );
+
+    for( aiCamera* cam : cameras ) {
+        if ( cam->mName == fn ) {
+            cam->mName.Set( new_name );
+            break;
+        }
+    }
+
+    for( aiLight* light : lights ) {
+        if ( light->mName == fn ) {
+            light->mName.Set( new_name );
+            break;
+        }
+    }
+
+    for( aiAnimation* anim : animations ) {
+        for ( unsigned int i = 0; i < anim->mNumChannels; ++i ) {
+            aiNodeAnim* const na = anim->mChannels[ i ];
+            if ( na->mNodeName == fn ) {
+                na->mNodeName.Set( new_name );
+                break;
+            }
+        }
+    }
+}
+
+
+std::string Converter::FixNodeName( const std::string& name )
+{
+    // strip Model:: prefix, avoiding ambiguities (i.e. don't strip if
+    // this causes ambiguities, well possible between empty identifiers,
+    // such as "Model::" and ""). Make sure the behaviour is consistent
+    // across multiple calls to FixNodeName().
+    if ( name.substr( 0, 7 ) == "Model::" ) {
+        std::string temp = name.substr( 7 );
+
+        const NodeNameMap::const_iterator it = node_names.find( temp );
+        if ( it != node_names.end() ) {
+            if ( !( *it ).second ) {
+                return FixNodeName( name + "_" );
+            }
+        }
+        node_names[ temp ] = true;
+
+        const NameNameMap::const_iterator rit = renamed_nodes.find( temp );
+        return rit == renamed_nodes.end() ? temp : ( *rit ).second;
+    }
+
+    const NodeNameMap::const_iterator it = node_names.find( name );
+    if ( it != node_names.end() ) {
+        if ( ( *it ).second ) {
+            return FixNodeName( name + "_" );
+        }
+    }
+    node_names[ name ] = false;
+
+    const NameNameMap::const_iterator rit = renamed_nodes.find( name );
+    return rit == renamed_nodes.end() ? name : ( *rit ).second;
+}
+
+void Converter::ConvertAnimationStack( const AnimationStack& st )
+{
+    const AnimationLayerList& layers = st.Layers();
+    if ( layers.empty() ) {
+        return;
+    }
+
+    aiAnimation* const anim = new aiAnimation();
+    animations.push_back( anim );
+
+    // strip AnimationStack:: prefix
+    std::string name = st.Name();
+    if ( name.substr( 0, 16 ) == "AnimationStack::" ) {
+        name = name.substr( 16 );
+    }
+    else if ( name.substr( 0, 11 ) == "AnimStack::" ) {
+        name = name.substr( 11 );
+    }
+
+    anim->mName.Set( name );
+
+    // need to find all nodes for which we need to generate node animations -
+    // it may happen that we need to merge multiple layers, though.
+    NodeMap node_map;
+
+    // reverse mapping from curves to layers, much faster than querying
+    // the FBX DOM for it.
+    LayerMap layer_map;
+
+    const char* prop_whitelist[] = {
+        "Lcl Scaling",
+        "Lcl Rotation",
+        "Lcl Translation"
+    };
+
+    for( const AnimationLayer* layer : layers ) {
+        ai_assert( layer );
+
+        const AnimationCurveNodeList& nodes = layer->Nodes( prop_whitelist, 3 );
+        for( const AnimationCurveNode* node : nodes ) {
+            ai_assert( node );
+
+            const Model* const model = dynamic_cast<const Model*>( node->Target() );
+            // this can happen - it could also be a NodeAttribute (i.e. for camera animations)
+            if ( !model ) {
+                continue;
+            }
+
+            const std::string& name = FixNodeName( model->Name() );
+            node_map[ name ].push_back( node );
+
+            layer_map[ node ] = layer;
+        }
+    }
+
+    // generate node animations
+    std::vector<aiNodeAnim*> node_anims;
+
+    double min_time = 1e10;
+    double max_time = -1e10;
+
+    int64_t start_time = st.LocalStart();
+    int64_t stop_time = st.LocalStop();
+    bool has_local_startstop = start_time != 0 || stop_time != 0;
+    if ( !has_local_startstop ) {
+        // no time range given, so accept every keyframe and use the actual min/max time
+        // the numbers are INT64_MIN/MAX, the 20000 is for safety because GenerateNodeAnimations uses an epsilon of 10000
+        start_time = -9223372036854775807ll + 20000;
+        stop_time = 9223372036854775807ll - 20000;
+    }
+
+    try {
+        for( const NodeMap::value_type& kv : node_map ) {
+            GenerateNodeAnimations( node_anims,
+                kv.first,
+                kv.second,
+                layer_map,
+                start_time, stop_time,
+                max_time,
+                min_time );
+        }
+    }
+    catch ( std::exception& ) {
+        std::for_each( node_anims.begin(), node_anims.end(), Util::delete_fun<aiNodeAnim>() );
+        throw;
+    }
+
+    if ( node_anims.size() ) {
+        anim->mChannels = new aiNodeAnim*[ node_anims.size() ]();
+        anim->mNumChannels = static_cast<unsigned int>( node_anims.size() );
+
+        std::swap_ranges( node_anims.begin(), node_anims.end(), anim->mChannels );
+    }
+    else {
+        // empty animations would fail validation, so drop them
+        delete anim;
+        animations.pop_back();
+        FBXImporter::LogInfo( "ignoring empty AnimationStack (using IK?): " + name );
+        return;
+    }
+
+    double start_time_fps = has_local_startstop ? (CONVERT_FBX_TIME(start_time) * anim_fps) : min_time;
+    double stop_time_fps = has_local_startstop ? (CONVERT_FBX_TIME(stop_time) * anim_fps) : max_time;
+
+    // adjust relative timing for animation
+    for ( unsigned int c = 0; c < anim->mNumChannels; c++ ) {
+        aiNodeAnim* channel = anim->mChannels[ c ];
+        for ( uint32_t i = 0; i < channel->mNumPositionKeys; i++ )
+            channel->mPositionKeys[ i ].mTime -= start_time_fps;
+        for ( uint32_t i = 0; i < channel->mNumRotationKeys; i++ )
+            channel->mRotationKeys[ i ].mTime -= start_time_fps;
+        for ( uint32_t i = 0; i < channel->mNumScalingKeys; i++ )
+            channel->mScalingKeys[ i ].mTime -= start_time_fps;
+    }
+
+    // for some mysterious reason, mDuration is simply the maximum key -- the
+    // validator always assumes animations to start at zero.
+    anim->mDuration = stop_time_fps - start_time_fps;
+    anim->mTicksPerSecond = anim_fps;
+}
+
+#ifdef ASSIMP_BUILD_DEBUG
+// ------------------------------------------------------------------------------------------------
+// sanity check whether the input is ok
+static void validateAnimCurveNodes( const std::vector<const AnimationCurveNode*>& curves,
+    bool strictMode ) {
+    const Object* target( NULL );
+    for( const AnimationCurveNode* node : curves ) {
+        if ( !target ) {
+            target = node->Target();
+        }
+        if ( node->Target() != target ) {
+            FBXImporter::LogWarn( "Node target is nullptr type." );
+        }
+        if ( strictMode ) {
+            ai_assert( node->Target() == target );
+        }
+    }
+}
+#endif // ASSIMP_BUILD_DEBUG
+
+// ------------------------------------------------------------------------------------------------
+void Converter::GenerateNodeAnimations( std::vector<aiNodeAnim*>& node_anims,
+    const std::string& fixed_name,
+    const std::vector<const AnimationCurveNode*>& curves,
+    const LayerMap& layer_map,
+    int64_t start, int64_t stop,
+    double& max_time,
+    double& min_time )
+{
+
+    NodeMap node_property_map;
+    ai_assert( curves.size() );
+
+#ifdef ASSIMP_BUILD_DEBUG
+    validateAnimCurveNodes( curves, doc.Settings().strictMode );
+#endif
+    const AnimationCurveNode* curve_node = NULL;
+    for( const AnimationCurveNode* node : curves ) {
+        ai_assert( node );
+
+        if ( node->TargetProperty().empty() ) {
+            FBXImporter::LogWarn( "target property for animation curve not set: " + node->Name() );
+            continue;
+        }
+
+        curve_node = node;
+        if ( node->Curves().empty() ) {
+            FBXImporter::LogWarn( "no animation curves assigned to AnimationCurveNode: " + node->Name() );
+            continue;
+        }
+
+        node_property_map[ node->TargetProperty() ].push_back( node );
+    }
+
+    ai_assert( curve_node );
+    ai_assert( curve_node->TargetAsModel() );
+
+    const Model& target = *curve_node->TargetAsModel();
+
+    // check for all possible transformation components
+    NodeMap::const_iterator chain[ TransformationComp_MAXIMUM ];
+
+    bool has_any = false;
+    bool has_complex = false;
+
+    for ( size_t i = 0; i < TransformationComp_MAXIMUM; ++i ) {
+        const TransformationComp comp = static_cast<TransformationComp>( i );
+
+        // inverse pivots don't exist in the input, we just generate them
+        if ( comp == TransformationComp_RotationPivotInverse || comp == TransformationComp_ScalingPivotInverse ) {
+            chain[ i ] = node_property_map.end();
+            continue;
+        }
+
+        chain[ i ] = node_property_map.find( NameTransformationCompProperty( comp ) );
+        if ( chain[ i ] != node_property_map.end() ) {
+
+            // check if this curves contains redundant information by looking
+            // up the corresponding node's transformation chain.
+            if ( doc.Settings().optimizeEmptyAnimationCurves &&
+                IsRedundantAnimationData( target, comp, ( *chain[ i ] ).second ) ) {
+
+                FBXImporter::LogDebug( "dropping redundant animation channel for node " + target.Name() );
+                continue;
+            }
+
+            has_any = true;
+
+            if ( comp != TransformationComp_Rotation && comp != TransformationComp_Scaling && comp != TransformationComp_Translation &&
+                comp != TransformationComp_GeometricScaling && comp != TransformationComp_GeometricRotation && comp != TransformationComp_GeometricTranslation )
+            {
+                has_complex = true;
+            }
+        }
+    }
+
+    if ( !has_any ) {
+        FBXImporter::LogWarn( "ignoring node animation, did not find any transformation key frames" );
+        return;
+    }
+
+    // this needs to play nicely with GenerateTransformationNodeChain() which will
+    // be invoked _later_ (animations come first). If this node has only rotation,
+    // scaling and translation _and_ there are no animated other components either,
+    // we can use a single node and also a single node animation channel.
+    if ( !has_complex && !NeedsComplexTransformationChain( target ) ) {
+
+        aiNodeAnim* const nd = GenerateSimpleNodeAnim( fixed_name, target, chain,
+            node_property_map.end(),
+            layer_map,
+            start, stop,
+            max_time,
+            min_time,
+            true // input is TRS order, assimp is SRT
+            );
+
+        ai_assert( nd );
+        if ( nd->mNumPositionKeys == 0 && nd->mNumRotationKeys == 0 && nd->mNumScalingKeys == 0 ) {
+            delete nd;
+        }
+        else {
+            node_anims.push_back( nd );
+        }
+        return;
+    }
+
+    // otherwise, things get gruesome and we need separate animation channels
+    // for each part of the transformation chain. Remember which channels
+    // we generated and pass this information to the node conversion
+    // code to avoid nodes that have identity transform, but non-identity
+    // animations, being dropped.
+    unsigned int flags = 0, bit = 0x1;
+    for ( size_t i = 0; i < TransformationComp_MAXIMUM; ++i, bit <<= 1 ) {
+        const TransformationComp comp = static_cast<TransformationComp>( i );
+
+        if ( chain[ i ] != node_property_map.end() ) {
+            flags |= bit;
+
+            ai_assert( comp != TransformationComp_RotationPivotInverse );
+            ai_assert( comp != TransformationComp_ScalingPivotInverse );
+
+            const std::string& chain_name = NameTransformationChainNode( fixed_name, comp );
+
+            aiNodeAnim* na = nullptr;
+            switch ( comp )
+            {
+            case TransformationComp_Rotation:
+            case TransformationComp_PreRotation:
+            case TransformationComp_PostRotation:
+            case TransformationComp_GeometricRotation:
+                na = GenerateRotationNodeAnim( chain_name,
+                    target,
+                    ( *chain[ i ] ).second,
+                    layer_map,
+                    start, stop,
+                    max_time,
+                    min_time );
+
+                break;
+
+            case TransformationComp_RotationOffset:
+            case TransformationComp_RotationPivot:
+            case TransformationComp_ScalingOffset:
+            case TransformationComp_ScalingPivot:
+            case TransformationComp_Translation:
+            case TransformationComp_GeometricTranslation:
+                na = GenerateTranslationNodeAnim( chain_name,
+                    target,
+                    ( *chain[ i ] ).second,
+                    layer_map,
+                    start, stop,
+                    max_time,
+                    min_time );
+
+                // pivoting requires us to generate an implicit inverse channel to undo the pivot translation
+                if ( comp == TransformationComp_RotationPivot ) {
+                    const std::string& invName = NameTransformationChainNode( fixed_name,
+                        TransformationComp_RotationPivotInverse );
+
+                    aiNodeAnim* const inv = GenerateTranslationNodeAnim( invName,
+                        target,
+                        ( *chain[ i ] ).second,
+                        layer_map,
+                        start, stop,
+                        max_time,
+                        min_time,
+                        true );
+
+                    ai_assert( inv );
+                    if ( inv->mNumPositionKeys == 0 && inv->mNumRotationKeys == 0 && inv->mNumScalingKeys == 0 ) {
+                        delete inv;
+                    }
+                    else {
+                        node_anims.push_back( inv );
+                    }
+
+                    ai_assert( TransformationComp_RotationPivotInverse > i );
+                    flags |= bit << ( TransformationComp_RotationPivotInverse - i );
+                }
+                else if ( comp == TransformationComp_ScalingPivot ) {
+                    const std::string& invName = NameTransformationChainNode( fixed_name,
+                        TransformationComp_ScalingPivotInverse );
+
+                    aiNodeAnim* const inv = GenerateTranslationNodeAnim( invName,
+                        target,
+                        ( *chain[ i ] ).second,
+                        layer_map,
+                        start, stop,
+                        max_time,
+                        min_time,
+                        true );
+
+                    ai_assert( inv );
+                    if ( inv->mNumPositionKeys == 0 && inv->mNumRotationKeys == 0 && inv->mNumScalingKeys == 0 ) {
+                        delete inv;
+                    }
+                    else {
+                        node_anims.push_back( inv );
+                    }
+
+                    ai_assert( TransformationComp_RotationPivotInverse > i );
+                    flags |= bit << ( TransformationComp_RotationPivotInverse - i );
+                }
+
+                break;
+
+            case TransformationComp_Scaling:
+            case TransformationComp_GeometricScaling:
+                na = GenerateScalingNodeAnim( chain_name,
+                    target,
+                    ( *chain[ i ] ).second,
+                    layer_map,
+                    start, stop,
+                    max_time,
+                    min_time );
+
+                break;
+
+            default:
+                ai_assert( false );
+            }
+
+            ai_assert( na );
+            if ( na->mNumPositionKeys == 0 && na->mNumRotationKeys == 0 && na->mNumScalingKeys == 0 ) {
+                delete na;
+            }
+            else {
+                node_anims.push_back( na );
+            }
+            continue;
+        }
+    }
+
+    node_anim_chain_bits[ fixed_name ] = flags;
+}
+
+bool Converter::IsRedundantAnimationData( const Model& target,
+    TransformationComp comp,
+    const std::vector<const AnimationCurveNode*>& curves )
+{
+    ai_assert( curves.size() );
+
+    // look for animation nodes with
+    //  * sub channels for all relevant components set
+    //  * one key/value pair per component
+    //  * combined values match up the corresponding value in the bind pose node transformation
+    // only such nodes are 'redundant' for this function.
+
+    if ( curves.size() > 1 ) {
+        return false;
+    }
+
+    const AnimationCurveNode& nd = *curves.front();
+    const AnimationCurveMap& sub_curves = nd.Curves();
+
+    const AnimationCurveMap::const_iterator dx = sub_curves.find( "d|X" );
+    const AnimationCurveMap::const_iterator dy = sub_curves.find( "d|Y" );
+    const AnimationCurveMap::const_iterator dz = sub_curves.find( "d|Z" );
+
+    if ( dx == sub_curves.end() || dy == sub_curves.end() || dz == sub_curves.end() ) {
+        return false;
+    }
+
+    const KeyValueList& vx = ( *dx ).second->GetValues();
+    const KeyValueList& vy = ( *dy ).second->GetValues();
+    const KeyValueList& vz = ( *dz ).second->GetValues();
+
+    if ( vx.size() != 1 || vy.size() != 1 || vz.size() != 1 ) {
+        return false;
+    }
+
+    const aiVector3D dyn_val = aiVector3D( vx[ 0 ], vy[ 0 ], vz[ 0 ] );
+    const aiVector3D& static_val = PropertyGet<aiVector3D>( target.Props(),
+        NameTransformationCompProperty( comp ),
+        TransformationCompDefaultValue( comp )
+        );
+
+    const float epsilon = 1e-6f;
+    return ( dyn_val - static_val ).SquareLength() < epsilon;
+}
+
+
+aiNodeAnim* Converter::GenerateRotationNodeAnim( const std::string& name,
+    const Model& target,
+    const std::vector<const AnimationCurveNode*>& curves,
+    const LayerMap& layer_map,
+    int64_t start, int64_t stop,
+    double& max_time,
+    double& min_time )
+{
+    std::unique_ptr<aiNodeAnim> na( new aiNodeAnim() );
+    na->mNodeName.Set( name );
+
+    ConvertRotationKeys( na.get(), curves, layer_map, start, stop, max_time, min_time, target.RotationOrder() );
+
+    // dummy scaling key
+    na->mScalingKeys = new aiVectorKey[ 1 ];
+    na->mNumScalingKeys = 1;
+
+    na->mScalingKeys[ 0 ].mTime = 0.;
+    na->mScalingKeys[ 0 ].mValue = aiVector3D( 1.0f, 1.0f, 1.0f );
+
+    // dummy position key
+    na->mPositionKeys = new aiVectorKey[ 1 ];
+    na->mNumPositionKeys = 1;
+
+    na->mPositionKeys[ 0 ].mTime = 0.;
+    na->mPositionKeys[ 0 ].mValue = aiVector3D();
+
+    return na.release();
+}
+
+aiNodeAnim* Converter::GenerateScalingNodeAnim( const std::string& name,
+    const Model& /*target*/,
+    const std::vector<const AnimationCurveNode*>& curves,
+    const LayerMap& layer_map,
+    int64_t start, int64_t stop,
+    double& max_time,
+    double& min_time )
+{
+    std::unique_ptr<aiNodeAnim> na( new aiNodeAnim() );
+    na->mNodeName.Set( name );
+
+    ConvertScaleKeys( na.get(), curves, layer_map, start, stop, max_time, min_time );
+
+    // dummy rotation key
+    na->mRotationKeys = new aiQuatKey[ 1 ];
+    na->mNumRotationKeys = 1;
+
+    na->mRotationKeys[ 0 ].mTime = 0.;
+    na->mRotationKeys[ 0 ].mValue = aiQuaternion();
+
+    // dummy position key
+    na->mPositionKeys = new aiVectorKey[ 1 ];
+    na->mNumPositionKeys = 1;
+
+    na->mPositionKeys[ 0 ].mTime = 0.;
+    na->mPositionKeys[ 0 ].mValue = aiVector3D();
+
+    return na.release();
+}
+
+
+aiNodeAnim* Converter::GenerateTranslationNodeAnim( const std::string& name,
+    const Model& /*target*/,
+    const std::vector<const AnimationCurveNode*>& curves,
+    const LayerMap& layer_map,
+    int64_t start, int64_t stop,
+    double& max_time,
+    double& min_time,
+    bool inverse )
+{
+    std::unique_ptr<aiNodeAnim> na( new aiNodeAnim() );
+    na->mNodeName.Set( name );
+
+    ConvertTranslationKeys( na.get(), curves, layer_map, start, stop, max_time, min_time );
+
+    if ( inverse ) {
+        for ( unsigned int i = 0; i < na->mNumPositionKeys; ++i ) {
+            na->mPositionKeys[ i ].mValue *= -1.0f;
+        }
+    }
+
+    // dummy scaling key
+    na->mScalingKeys = new aiVectorKey[ 1 ];
+    na->mNumScalingKeys = 1;
+
+    na->mScalingKeys[ 0 ].mTime = 0.;
+    na->mScalingKeys[ 0 ].mValue = aiVector3D( 1.0f, 1.0f, 1.0f );
+
+    // dummy rotation key
+    na->mRotationKeys = new aiQuatKey[ 1 ];
+    na->mNumRotationKeys = 1;
+
+    na->mRotationKeys[ 0 ].mTime = 0.;
+    na->mRotationKeys[ 0 ].mValue = aiQuaternion();
+
+    return na.release();
+}
+
+aiNodeAnim* Converter::GenerateSimpleNodeAnim( const std::string& name,
+    const Model& target,
+    NodeMap::const_iterator chain[ TransformationComp_MAXIMUM ],
+    NodeMap::const_iterator iter_end,
+    const LayerMap& layer_map,
+    int64_t start, int64_t stop,
+    double& max_time,
+    double& min_time,
+    bool reverse_order )
+
+{
+    std::unique_ptr<aiNodeAnim> na( new aiNodeAnim() );
+    na->mNodeName.Set( name );
+
+    const PropertyTable& props = target.Props();
+
+    // need to convert from TRS order to SRT?
+    if ( reverse_order ) {
+
+        aiVector3D def_scale = PropertyGet( props, "Lcl Scaling", aiVector3D( 1.f, 1.f, 1.f ) );
+        aiVector3D def_translate = PropertyGet( props, "Lcl Translation", aiVector3D( 0.f, 0.f, 0.f ) );
+        aiVector3D def_rot = PropertyGet( props, "Lcl Rotation", aiVector3D( 0.f, 0.f, 0.f ) );
+
+        KeyFrameListList scaling;
+        KeyFrameListList translation;
+        KeyFrameListList rotation;
+
+        if ( chain[ TransformationComp_Scaling ] != iter_end ) {
+            scaling = GetKeyframeList( ( *chain[ TransformationComp_Scaling ] ).second, start, stop );
+        }
+
+        if ( chain[ TransformationComp_Translation ] != iter_end ) {
+            translation = GetKeyframeList( ( *chain[ TransformationComp_Translation ] ).second, start, stop );
+        }
+
+        if ( chain[ TransformationComp_Rotation ] != iter_end ) {
+            rotation = GetKeyframeList( ( *chain[ TransformationComp_Rotation ] ).second, start, stop );
+        }
+
+        KeyFrameListList joined;
+        joined.insert( joined.end(), scaling.begin(), scaling.end() );
+        joined.insert( joined.end(), translation.begin(), translation.end() );
+        joined.insert( joined.end(), rotation.begin(), rotation.end() );
+
+        const KeyTimeList& times = GetKeyTimeList( joined );
+
+        aiQuatKey* out_quat = new aiQuatKey[ times.size() ];
+        aiVectorKey* out_scale = new aiVectorKey[ times.size() ];
+        aiVectorKey* out_translation = new aiVectorKey[ times.size() ];
+
+        if ( times.size() )
+        {
+            ConvertTransformOrder_TRStoSRT( out_quat, out_scale, out_translation,
+                scaling,
+                translation,
+                rotation,
+                times,
+                max_time,
+                min_time,
+                target.RotationOrder(),
+                def_scale,
+                def_translate,
+                def_rot );
+        }
+
+        // XXX remove duplicates / redundant keys which this operation did
+        // likely produce if not all three channels were equally dense.
+
+        na->mNumScalingKeys = static_cast<unsigned int>( times.size() );
+        na->mNumRotationKeys = na->mNumScalingKeys;
+        na->mNumPositionKeys = na->mNumScalingKeys;
+
+        na->mScalingKeys = out_scale;
+        na->mRotationKeys = out_quat;
+        na->mPositionKeys = out_translation;
+    }
+    else {
+
+        // if a particular transformation is not given, grab it from
+        // the corresponding node to meet the semantics of aiNodeAnim,
+        // which requires all of rotation, scaling and translation
+        // to be set.
+        if ( chain[ TransformationComp_Scaling ] != iter_end ) {
+            ConvertScaleKeys( na.get(), ( *chain[ TransformationComp_Scaling ] ).second,
+                layer_map,
+                start, stop,
+                max_time,
+                min_time );
+        }
+        else {
+            na->mScalingKeys = new aiVectorKey[ 1 ];
+            na->mNumScalingKeys = 1;
+
+            na->mScalingKeys[ 0 ].mTime = 0.;
+            na->mScalingKeys[ 0 ].mValue = PropertyGet( props, "Lcl Scaling",
+                aiVector3D( 1.f, 1.f, 1.f ) );
+        }
+
+        if ( chain[ TransformationComp_Rotation ] != iter_end ) {
+            ConvertRotationKeys( na.get(), ( *chain[ TransformationComp_Rotation ] ).second,
+                layer_map,
+                start, stop,
+                max_time,
+                min_time,
+                target.RotationOrder() );
+        }
+        else {
+            na->mRotationKeys = new aiQuatKey[ 1 ];
+            na->mNumRotationKeys = 1;
+
+            na->mRotationKeys[ 0 ].mTime = 0.;
+            na->mRotationKeys[ 0 ].mValue = EulerToQuaternion(
+                PropertyGet( props, "Lcl Rotation", aiVector3D( 0.f, 0.f, 0.f ) ),
+                target.RotationOrder() );
+        }
+
+        if ( chain[ TransformationComp_Translation ] != iter_end ) {
+            ConvertTranslationKeys( na.get(), ( *chain[ TransformationComp_Translation ] ).second,
+                layer_map,
+                start, stop,
+                max_time,
+                min_time );
+        }
+        else {
+            na->mPositionKeys = new aiVectorKey[ 1 ];
+            na->mNumPositionKeys = 1;
+
+            na->mPositionKeys[ 0 ].mTime = 0.;
+            na->mPositionKeys[ 0 ].mValue = PropertyGet( props, "Lcl Translation",
+                aiVector3D( 0.f, 0.f, 0.f ) );
+        }
+
+    }
+    return na.release();
+}
+
+Converter::KeyFrameListList Converter::GetKeyframeList( const std::vector<const AnimationCurveNode*>& nodes, int64_t start, int64_t stop )
+{
+    KeyFrameListList inputs;
+    inputs.reserve( nodes.size() * 3 );
+
+    //give some breathing room for rounding errors
+    int64_t adj_start = start - 10000;
+    int64_t adj_stop = stop + 10000;
+
+    for( const AnimationCurveNode* node : nodes ) {
+        ai_assert( node );
+
+        const AnimationCurveMap& curves = node->Curves();
+        for( const AnimationCurveMap::value_type& kv : curves ) {
+
+            unsigned int mapto;
+            if ( kv.first == "d|X" ) {
+                mapto = 0;
+            }
+            else if ( kv.first == "d|Y" ) {
+                mapto = 1;
+            }
+            else if ( kv.first == "d|Z" ) {
+                mapto = 2;
+            }
+            else {
+                FBXImporter::LogWarn( "ignoring scale animation curve, did not recognize target component" );
+                continue;
+            }
+
+            const AnimationCurve* const curve = kv.second;
+            ai_assert( curve->GetKeys().size() == curve->GetValues().size() && curve->GetKeys().size() );
+
+            //get values within the start/stop time window
+            std::shared_ptr<KeyTimeList> Keys( new KeyTimeList() );
+            std::shared_ptr<KeyValueList> Values( new KeyValueList() );
+            const size_t count = curve->GetKeys().size();
+            Keys->reserve( count );
+            Values->reserve( count );
+            for (size_t n = 0; n < count; n++ )
+            {
+                int64_t k = curve->GetKeys().at( n );
+                if ( k >= adj_start && k <= adj_stop )
+                {
+                    Keys->push_back( k );
+                    Values->push_back( curve->GetValues().at( n ) );
+                }
+            }
+
+            inputs.push_back( std::make_tuple( Keys, Values, mapto ) );
+        }
+    }
+    return inputs; // pray for NRVO :-)
+}
+
+
+KeyTimeList Converter::GetKeyTimeList( const KeyFrameListList& inputs )
+{
+    ai_assert( inputs.size() );
+
+    // reserve some space upfront - it is likely that the keyframe lists
+    // have matching time values, so max(of all keyframe lists) should
+    // be a good estimate.
+    KeyTimeList keys;
+
+    size_t estimate = 0;
+    for( const KeyFrameList& kfl : inputs ) {
+        estimate = std::max( estimate, std::get<0>(kfl)->size() );
+    }
+
+    keys.reserve( estimate );
+
+    std::vector<unsigned int> next_pos;
+    next_pos.resize( inputs.size(), 0 );
+
+    const size_t count = inputs.size();
+    while ( true ) {
+
+        int64_t min_tick = std::numeric_limits<int64_t>::max();
+        for ( size_t i = 0; i < count; ++i ) {
+            const KeyFrameList& kfl = inputs[ i ];
+
+            if ( std::get<0>(kfl)->size() > next_pos[ i ] && std::get<0>(kfl)->at( next_pos[ i ] ) < min_tick ) {
+                min_tick = std::get<0>(kfl)->at( next_pos[ i ] );
+            }
+        }
+
+        if ( min_tick == std::numeric_limits<int64_t>::max() ) {
+            break;
+        }
+        keys.push_back( min_tick );
+
+        for ( size_t i = 0; i < count; ++i ) {
+            const KeyFrameList& kfl = inputs[ i ];
+
+
+            while ( std::get<0>(kfl)->size() > next_pos[ i ] && std::get<0>(kfl)->at( next_pos[ i ] ) == min_tick ) {
+                ++next_pos[ i ];
+            }
+        }
+    }
+
+    return keys;
+}
+
+void Converter::InterpolateKeys( aiVectorKey* valOut, const KeyTimeList& keys, const KeyFrameListList& inputs,
+    const aiVector3D& def_value,
+    double& max_time,
+    double& min_time )
+
+{
+    ai_assert( keys.size() );
+    ai_assert( valOut );
+
+    std::vector<unsigned int> next_pos;
+    const size_t count = inputs.size();
+
+    next_pos.resize( inputs.size(), 0 );
+
+    for( KeyTimeList::value_type time : keys ) {
+        ai_real result[ 3 ] = { def_value.x, def_value.y, def_value.z };
+
+        for ( size_t i = 0; i < count; ++i ) {
+            const KeyFrameList& kfl = inputs[ i ];
+
+            const size_t ksize = std::get<0>(kfl)->size();
+            if ( ksize > next_pos[ i ] && std::get<0>(kfl)->at( next_pos[ i ] ) == time ) {
+                ++next_pos[ i ];
+            }
+
+            const size_t id0 = next_pos[ i ]>0 ? next_pos[ i ] - 1 : 0;
+            const size_t id1 = next_pos[ i ] == ksize ? ksize - 1 : next_pos[ i ];
+
+            // use lerp for interpolation
+            const KeyValueList::value_type valueA = std::get<1>(kfl)->at( id0 );
+            const KeyValueList::value_type valueB = std::get<1>(kfl)->at( id1 );
+
+            const KeyTimeList::value_type timeA = std::get<0>(kfl)->at( id0 );
+            const KeyTimeList::value_type timeB = std::get<0>(kfl)->at( id1 );
+
+            const ai_real factor = timeB == timeA ? ai_real(0.) : static_cast<ai_real>( ( time - timeA ) ) / ( timeB - timeA );
+            const ai_real interpValue = static_cast<ai_real>( valueA + ( valueB - valueA ) * factor );
+
+            result[ std::get<2>(kfl) ] = interpValue;
+        }
+
+        // magic value to convert fbx times to seconds
+        valOut->mTime = CONVERT_FBX_TIME( time ) * anim_fps;
+
+        min_time = std::min( min_time, valOut->mTime );
+        max_time = std::max( max_time, valOut->mTime );
+
+        valOut->mValue.x = result[ 0 ];
+        valOut->mValue.y = result[ 1 ];
+        valOut->mValue.z = result[ 2 ];
+
+        ++valOut;
+    }
+}
+
+void Converter::InterpolateKeys( aiQuatKey* valOut, const KeyTimeList& keys, const KeyFrameListList& inputs,
+    const aiVector3D& def_value,
+    double& maxTime,
+    double& minTime,
+    Model::RotOrder order )
+{
+    ai_assert( keys.size() );
+    ai_assert( valOut );
+
+    std::unique_ptr<aiVectorKey[]> temp( new aiVectorKey[ keys.size() ] );
+    InterpolateKeys( temp.get(), keys, inputs, def_value, maxTime, minTime );
+
+    aiMatrix4x4 m;
+
+    aiQuaternion lastq;
+
+    for ( size_t i = 0, c = keys.size(); i < c; ++i ) {
+
+        valOut[ i ].mTime = temp[ i ].mTime;
+
+        GetRotationMatrix( order, temp[ i ].mValue, m );
+        aiQuaternion quat = aiQuaternion( aiMatrix3x3( m ) );
+
+        // take shortest path by checking the inner product
+        // http://www.3dkingdoms.com/weekly/weekly.php?a=36
+        if ( quat.x * lastq.x + quat.y * lastq.y + quat.z * lastq.z + quat.w * lastq.w < 0 )
+        {
+            quat.x = -quat.x;
+            quat.y = -quat.y;
+            quat.z = -quat.z;
+            quat.w = -quat.w;
+        }
+        lastq = quat;
+
+        valOut[ i ].mValue = quat;
+    }
+}
+
+void Converter::ConvertTransformOrder_TRStoSRT( aiQuatKey* out_quat, aiVectorKey* out_scale,
+    aiVectorKey* out_translation,
+    const KeyFrameListList& scaling,
+    const KeyFrameListList& translation,
+    const KeyFrameListList& rotation,
+    const KeyTimeList& times,
+    double& maxTime,
+    double& minTime,
+    Model::RotOrder order,
+    const aiVector3D& def_scale,
+    const aiVector3D& def_translate,
+    const aiVector3D& def_rotation )
+{
+    if ( rotation.size() ) {
+        InterpolateKeys( out_quat, times, rotation, def_rotation, maxTime, minTime, order );
+    }
+    else {
+        for ( size_t i = 0; i < times.size(); ++i ) {
+            out_quat[ i ].mTime = CONVERT_FBX_TIME( times[ i ] ) * anim_fps;
+            out_quat[ i ].mValue = EulerToQuaternion( def_rotation, order );
+        }
+    }
+
+    if ( scaling.size() ) {
+        InterpolateKeys( out_scale, times, scaling, def_scale, maxTime, minTime );
+    }
+    else {
+        for ( size_t i = 0; i < times.size(); ++i ) {
+            out_scale[ i ].mTime = CONVERT_FBX_TIME( times[ i ] ) * anim_fps;
+            out_scale[ i ].mValue = def_scale;
+        }
+    }
+
+    if ( translation.size() ) {
+        InterpolateKeys( out_translation, times, translation, def_translate, maxTime, minTime );
+    }
+    else {
+        for ( size_t i = 0; i < times.size(); ++i ) {
+            out_translation[ i ].mTime = CONVERT_FBX_TIME( times[ i ] ) * anim_fps;
+            out_translation[ i ].mValue = def_translate;
+        }
+    }
+
+    const size_t count = times.size();
+    for ( size_t i = 0; i < count; ++i ) {
+        aiQuaternion& r = out_quat[ i ].mValue;
+        aiVector3D& s = out_scale[ i ].mValue;
+        aiVector3D& t = out_translation[ i ].mValue;
+
+        aiMatrix4x4 mat, temp;
+        aiMatrix4x4::Translation( t, mat );
+        mat *= aiMatrix4x4( r.GetMatrix() );
+        mat *= aiMatrix4x4::Scaling( s, temp );
+
+        mat.Decompose( s, r, t );
+    }
+}
+
+aiQuaternion Converter::EulerToQuaternion( const aiVector3D& rot, Model::RotOrder order )
+{
+    aiMatrix4x4 m;
+    GetRotationMatrix( order, rot, m );
+
+    return aiQuaternion( aiMatrix3x3( m ) );
+}
+
+void Converter::ConvertScaleKeys( aiNodeAnim* na, const std::vector<const AnimationCurveNode*>& nodes, const LayerMap& /*layers*/,
+    int64_t start, int64_t stop,
+    double& maxTime,
+    double& minTime )
+{
+    ai_assert( nodes.size() );
+
+    // XXX for now, assume scale should be blended geometrically (i.e. two
+    // layers should be multiplied with each other). There is a FBX
+    // property in the layer to specify the behaviour, though.
+
+    const KeyFrameListList& inputs = GetKeyframeList( nodes, start, stop );
+    const KeyTimeList& keys = GetKeyTimeList( inputs );
+
+    na->mNumScalingKeys = static_cast<unsigned int>( keys.size() );
+    na->mScalingKeys = new aiVectorKey[ keys.size() ];
+    if ( keys.size() > 0 )
+        InterpolateKeys( na->mScalingKeys, keys, inputs, aiVector3D( 1.0f, 1.0f, 1.0f ), maxTime, minTime );
+}
+
+void Converter::ConvertTranslationKeys( aiNodeAnim* na, const std::vector<const AnimationCurveNode*>& nodes,
+    const LayerMap& /*layers*/,
+    int64_t start, int64_t stop,
+    double& maxTime,
+    double& minTime )
+{
+    ai_assert( nodes.size() );
+
+    // XXX see notes in ConvertScaleKeys()
+    const KeyFrameListList& inputs = GetKeyframeList( nodes, start, stop );
+    const KeyTimeList& keys = GetKeyTimeList( inputs );
+
+    na->mNumPositionKeys = static_cast<unsigned int>( keys.size() );
+    na->mPositionKeys = new aiVectorKey[ keys.size() ];
+    if ( keys.size() > 0 )
+        InterpolateKeys( na->mPositionKeys, keys, inputs, aiVector3D( 0.0f, 0.0f, 0.0f ), maxTime, minTime );
+}
+
+void Converter::ConvertRotationKeys( aiNodeAnim* na, const std::vector<const AnimationCurveNode*>& nodes,
+    const LayerMap& /*layers*/,
+    int64_t start, int64_t stop,
+    double& maxTime,
+    double& minTime,
+    Model::RotOrder order )
+{
+    ai_assert( nodes.size() );
+
+    // XXX see notes in ConvertScaleKeys()
+    const std::vector< KeyFrameList >& inputs = GetKeyframeList( nodes, start, stop );
+    const KeyTimeList& keys = GetKeyTimeList( inputs );
+
+    na->mNumRotationKeys = static_cast<unsigned int>( keys.size() );
+    na->mRotationKeys = new aiQuatKey[ keys.size() ];
+    if ( keys.size() > 0 )
+        InterpolateKeys( na->mRotationKeys, keys, inputs, aiVector3D( 0.0f, 0.0f, 0.0f ), maxTime, minTime, order );
+}
+
+void Converter::TransferDataToScene()
+{
+    ai_assert( !out->mMeshes );
+    ai_assert( !out->mNumMeshes );
+
+    // note: the trailing () ensures initialization with NULL - not
+    // many C++ users seem to know this, so pointing it out to avoid
+    // confusion why this code works.
+
+    if ( meshes.size() ) {
+        out->mMeshes = new aiMesh*[ meshes.size() ]();
+        out->mNumMeshes = static_cast<unsigned int>( meshes.size() );
+
+        std::swap_ranges( meshes.begin(), meshes.end(), out->mMeshes );
+    }
+
+    if ( materials.size() ) {
+        out->mMaterials = new aiMaterial*[ materials.size() ]();
+        out->mNumMaterials = static_cast<unsigned int>( materials.size() );
+
+        std::swap_ranges( materials.begin(), materials.end(), out->mMaterials );
+    }
+
+    if ( animations.size() ) {
+        out->mAnimations = new aiAnimation*[ animations.size() ]();
+        out->mNumAnimations = static_cast<unsigned int>( animations.size() );
+
+        std::swap_ranges( animations.begin(), animations.end(), out->mAnimations );
+    }
+
+    if ( lights.size() ) {
+        out->mLights = new aiLight*[ lights.size() ]();
+        out->mNumLights = static_cast<unsigned int>( lights.size() );
+
+        std::swap_ranges( lights.begin(), lights.end(), out->mLights );
+    }
+
+    if ( cameras.size() ) {
+        out->mCameras = new aiCamera*[ cameras.size() ]();
+        out->mNumCameras = static_cast<unsigned int>( cameras.size() );
+
+        std::swap_ranges( cameras.begin(), cameras.end(), out->mCameras );
+    }
+
+    if ( textures.size() ) {
+        out->mTextures = new aiTexture*[ textures.size() ]();
+        out->mNumTextures = static_cast<unsigned int>( textures.size() );
+
+        std::swap_ranges( textures.begin(), textures.end(), out->mTextures );
+    }
+}
+
+//} // !anon
+
+// ------------------------------------------------------------------------------------------------
+void ConvertToAssimpScene(aiScene* out, const Document& doc)
+{
+    Converter converter(out,doc);
+}
+
+} // !FBX
+} // !Assimp
+
+#endif