From 42e353f2a672baed485c03acf30529c77092ece9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Antti=20M=C3=A4=C3=A4tt=C3=A4?= <antti.maatta@qt.io>
Date: Thu, 12 Jan 2017 13:41:32 +0200
Subject: [PATCH] Morph animation support for collada

---
 code/CMakeLists.txt     |   2 +
 code/ColladaHelper.h    |  31 +++++
 code/ColladaLoader.cpp  | 310 ++++++++++++++++++++++++++++++++++++++++++------
 code/ColladaLoader.h    |   5 +
 code/ColladaParser.cpp  |  48 +++++++-
 code/CreateAnimMesh.cpp |  92 ++++++++++++++
 code/CreateAnimMesh.h   |  56 +++++++++
 include/assimp/anim.h   |  95 +++++++++++++--
 include/assimp/mesh.h   |  36 +++++-
 9 files changed, 623 insertions(+), 52 deletions(-)
 create mode 100644 code/CreateAnimMesh.cpp
 create mode 100644 code/CreateAnimMesh.h

diff --git a/code/CMakeLists.txt b/code/CMakeLists.txt
index 35ecf50..e0747d6 100644
--- a/code/CMakeLists.txt
+++ b/code/CMakeLists.txt
@@ -171,6 +171,8 @@ SET( Common_SRCS
   Bitmap.h
   XMLTools.h
   Version.cpp
+  CreateAnimMesh.h
+  CreateAnimMesh.cpp
 )
 SOURCE_GROUP(Common FILES ${Common_SRCS})
 
diff --git a/code/ColladaHelper.h b/code/ColladaHelper.h
index 5a51642..5ff4904 100644
--- a/code/ColladaHelper.h
+++ b/code/ColladaHelper.h
@@ -89,6 +89,21 @@ enum InputType
     IT_Bitangent
 };
 
+/** Supported controller types */
+enum ControllerType
+{
+    Skin,
+    Morph
+};
+
+/** Supported morph methods */
+enum MorphMethod
+{
+    Normalized,
+    Relative
+};
+
+
 /** Contains all data for one of the different transformation types */
 struct Transform
 {
@@ -380,6 +395,12 @@ enum PrimitiveType
 /** A skeleton controller to deform a mesh with the use of joints */
 struct Controller
 {
+    // controller type
+    ControllerType mType;
+
+    // Morphing method if type is Morph
+    MorphMethod mMethod;
+
     // the URL of the mesh deformed by the controller.
     std::string mMeshId;
 
@@ -402,6 +423,9 @@ struct Controller
 
     // JointIndex-WeightIndex pairs for all vertices
     std::vector< std::pair<size_t, size_t> > mWeights;
+
+    std::string mMorphTarget;
+    std::string mMorphWeight;
 };
 
 /** A collada material. Pretty much the only member is a reference to an effect. */
@@ -577,6 +601,12 @@ struct AnimationChannel
     std::string mSourceTimes;
     /** Source URL of the value values. Collada calls them "output". */
     std::string mSourceValues;
+    /** Source URL of the IN_TANGENT semantic values. */
+    std::string mInTanValues;
+    /** Source URL of the OUT_TANGENT semantic values. */
+    std::string mOutTanValues;
+    /** Source URL of the INTERPOLATION semantic values. */
+    std::string mInterpolationValues;
 };
 
 /** An animation. Container for 0-x animation channels or 0-x animations */
@@ -645,6 +675,7 @@ struct Animation
 struct ChannelEntry
 {
     const Collada::AnimationChannel* mChannel; ///> the source channel
+    std::string mTargetId;
     std::string mTransformId;   // the ID of the transformation step of the node which is influenced
     size_t mTransformIndex; // Index into the node's transform chain to apply the channel to
     size_t mSubElement; // starting index inside the transform data
diff --git a/code/ColladaLoader.cpp b/code/ColladaLoader.cpp
index 6cc0f85..a3b6d6e 100644
--- a/code/ColladaLoader.cpp
+++ b/code/ColladaLoader.cpp
@@ -55,6 +55,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "ParsingUtils.h"
 #include "SkeletonMeshBuilder.h"
 #include "Defines.h"
+#include "CreateAnimMesh.h"
 
 #include "time.h"
 #include "math.h"
@@ -148,6 +149,7 @@ void ColladaLoader::InternReadFile( const std::string& pFile, aiScene* pScene, I
     mMeshIndexByID.clear();
     mMaterialIndexByName.clear();
     mMeshes.clear();
+    mTargetMeshes.clear();
     newMats.clear();
     mLights.clear();
     mCameras.clear();
@@ -562,6 +564,21 @@ void ColladaLoader::BuildMeshesForNode( const ColladaParser& pParser, const Coll
 }
 
 // ------------------------------------------------------------------------------------------------
+// Find mesh from either meshes or morph target meshes
+aiMesh *ColladaLoader::findMesh(std::string meshid)
+{
+    for (unsigned int i = 0; i < mMeshes.size(); i++)
+        if (std::string(mMeshes[i]->mName.data) == meshid)
+            return mMeshes[i];
+
+    for (unsigned int i = 0; i < mTargetMeshes.size(); i++)
+        if (std::string(mTargetMeshes[i]->mName.data) == meshid)
+            return mTargetMeshes[i];
+
+    return NULL;
+}
+
+// ------------------------------------------------------------------------------------------------
 // Creates a mesh for the given ColladaMesh face subset and returns the newly created mesh
 aiMesh* ColladaLoader::CreateMesh( const ColladaParser& pParser, const Collada::Mesh* pSrcMesh, const Collada::SubMesh& pSubMesh,
     const Collada::Controller* pSrcController, size_t pStartVertex, size_t pStartFace)
@@ -646,8 +663,70 @@ aiMesh* ColladaLoader::CreateMesh( const ColladaParser& pParser, const Collada::
             face.mIndices[b] = vertex++;
     }
 
+    // create morph target meshes if any
+    std::vector<aiMesh*> targetMeshes;
+    std::vector<float> targetWeights;
+    Collada::MorphMethod method;
+
+    for(std::map<std::string, Collada::Controller>::const_iterator it = pParser.mControllerLibrary.begin();
+        it != pParser.mControllerLibrary.end(); it++)
+    {
+        const Collada::Controller &c = it->second;
+        const Collada::Mesh* baseMesh = pParser.ResolveLibraryReference( pParser.mMeshLibrary, c.mMeshId);
+
+        if (c.mType == Collada::Morph && baseMesh->mName == pSrcMesh->mName)
+        {
+            const Collada::Accessor& targetAccessor = pParser.ResolveLibraryReference( pParser.mAccessorLibrary, c.mMorphTarget);
+            const Collada::Accessor& weightAccessor = pParser.ResolveLibraryReference( pParser.mAccessorLibrary, c.mMorphWeight);
+            const Collada::Data& targetData = pParser.ResolveLibraryReference( pParser.mDataLibrary, targetAccessor.mSource);
+            const Collada::Data& weightData = pParser.ResolveLibraryReference( pParser.mDataLibrary, weightAccessor.mSource);
+
+            // take method
+            method = c.mMethod;
+
+            if (!targetData.mIsStringArray)
+                throw DeadlyImportError( "target data must contain id. ");
+            if (weightData.mIsStringArray)
+                throw DeadlyImportError( "target weight data must not be textual ");
+
+            for (unsigned int i = 0; i < targetData.mStrings.size(); ++i)
+            {
+                const Collada::Mesh* targetMesh = pParser.ResolveLibraryReference(pParser.mMeshLibrary, targetData.mStrings.at(i));
+
+                aiMesh *aimesh = findMesh(targetMesh->mName);
+                if (!aimesh)
+                {
+                    if (targetMesh->mSubMeshes.size() > 1)
+                        throw DeadlyImportError( "Morhing target mesh must be a single");
+                    aimesh = CreateMesh(pParser, targetMesh, targetMesh->mSubMeshes.at(0), NULL, 0, 0);
+                    mTargetMeshes.push_back(aimesh);
+                }
+                targetMeshes.push_back(aimesh);
+            }
+            for (unsigned int i = 0; i < weightData.mValues.size(); ++i)
+                targetWeights.push_back(weightData.mValues.at(i));
+        }
+    }
+    if (targetMeshes.size() > 0 && targetWeights.size() == targetMeshes.size())
+    {
+        std::vector<aiAnimMesh*> animMeshes;
+        for (unsigned int i = 0; i < targetMeshes.size(); i++)
+        {
+            aiAnimMesh *animMesh = aiCreateAnimMesh(targetMeshes.at(i));
+            animMesh->mWeight = targetWeights[i];
+            animMeshes.push_back(animMesh);
+        }
+        dstMesh->mMethod = (method == Collada::Relative)
+                                ? aiMorphingMethod_MORPH_RELATIVE
+                                : aiMorphingMethod_MORPH_NORMALIZED;
+        dstMesh->mAnimMeshes = new aiAnimMesh*[animMeshes.size()];
+        dstMesh->mNumAnimMeshes = animMeshes.size();
+        for (unsigned int i = 0; i < animMeshes.size(); i++)
+            dstMesh->mAnimMeshes[i] = animMeshes.at(i);
+    }
+
     // create bones if given
-    if( pSrcController)
+    if( pSrcController && pSrcController->mType == Collada::Skin)
     {
         // refuse if the vertex count does not match
 //      if( pSrcController->mWeightCounts.size() != dstMesh->mNumVertices)
@@ -946,6 +1025,68 @@ void ColladaLoader::StoreAnimations( aiScene* pScene, const ColladaParser& pPars
         CreateAnimation( pScene, pParser, pSrcAnim, animName);
 }
 
+struct MorphTimeValues
+{
+    float mTime;
+    struct key
+    {
+        float mWeight;
+        unsigned int mValue;
+    };
+    std::vector<key> mKeys;
+};
+
+void insertMorphTimeValue(std::vector<MorphTimeValues> &values, float time, float weight, unsigned int value)
+{
+    MorphTimeValues::key k;
+    k.mValue = value;
+    k.mWeight = weight;
+    if (values.size() == 0 || time < values[0].mTime)
+    {
+        MorphTimeValues val;
+        val.mTime = time;
+        val.mKeys.push_back(k);
+        values.insert(values.begin(), val);
+        return;
+    }
+    if (time > values.back().mTime)
+    {
+        MorphTimeValues val;
+        val.mTime = time;
+        val.mKeys.push_back(k);
+        values.insert(values.end(), val);
+        return;
+    }
+    for (unsigned int i = 0; i < values.size(); i++)
+    {
+        if (std::abs(time - values[i].mTime) < 1e-6f)
+        {
+            values[i].mKeys.push_back(k);
+            return;
+        } else if (time > values[i].mTime && time < values[i+1].mTime)
+        {
+            MorphTimeValues val;
+            val.mTime = time;
+            val.mKeys.push_back(k);
+            values.insert(values.begin() + i, val);
+            return;
+        }
+    }
+    // should not get here
+}
+
+float getWeightAtKey(const std::vector<MorphTimeValues> &values, int key, unsigned int value)
+{
+    for (unsigned int i = 0; i < values[key].mKeys.size(); i++)
+    {
+        if (values[key].mKeys[i].mValue == value)
+            return values[key].mKeys[i].mWeight;
+    }
+    // no value at key found, try to interpolate if present at other keys. if not, return zero
+    // TODO: interpolation
+    return 0.0f;
+}
+
 // ------------------------------------------------------------------------------------------------
 // Constructs the animation for the given source anim
 void ColladaLoader::CreateAnimation( aiScene* pScene, const ColladaParser& pParser, const Collada::Animation* pSrcAnim, const std::string& pName)
@@ -955,6 +1096,8 @@ void ColladaLoader::CreateAnimation( aiScene* pScene, const ColladaParser& pPars
     CollectNodes( pScene->mRootNode, nodes);
 
     std::vector<aiNodeAnim*> anims;
+    std::vector<aiMeshMorphAnim*> morphAnims;
+
     for( std::vector<const aiNode*>::const_iterator nit = nodes.begin(); nit != nodes.end(); ++nit)
     {
         // find all the collada anim channels which refer to the current node
@@ -978,7 +1121,20 @@ void ColladaLoader::CreateAnimation( aiScene* pScene, const ColladaParser& pPars
             // find the slash that separates the node name - there should be only one
             std::string::size_type slashPos = srcChannel.mTarget.find( '/');
             if( slashPos == std::string::npos)
+            {
+                std::string::size_type targetPos = srcChannel.mTarget.find(srcNode->mID);
+                if (targetPos == std::string::npos)
+                    continue;
+
+                // not node transform, but something else. store as unknown animation channel for now
+                entry.mChannel = &(*cit);
+                entry.mTargetId = srcChannel.mTarget.substr(targetPos + pSrcAnim->mName.length(),
+                                        srcChannel.mTarget.length() - targetPos - pSrcAnim->mName.length());
+                if (entry.mTargetId.front() == '-')
+                    entry.mTargetId = entry.mTargetId.substr(1);
+                entries.push_back(entry);
                 continue;
+            }
             if( srcChannel.mTarget.find( '/', slashPos+1) != std::string::npos)
                 continue;
             std::string targetID = srcChannel.mTarget.substr( 0, slashPos);
@@ -1058,8 +1214,14 @@ void ColladaLoader::CreateAnimation( aiScene* pScene, const ColladaParser& pPars
                 if( srcNode->mTransforms[a].mID == entry.mTransformId)
                     entry.mTransformIndex = a;
 
-            if( entry.mTransformIndex == SIZE_MAX) {
-                continue;
+            if( entry.mTransformIndex == SIZE_MAX)
+            {
+                if (entry.mTransformId.find("morph-weights") != std::string::npos)
+                {
+                    entry.mTargetId = entry.mTransformId;
+                    entry.mTransformId = "";
+                } else
+                    continue;
             }
 
             entry.mChannel = &(*cit);
@@ -1203,49 +1365,125 @@ void ColladaLoader::CreateAnimation( aiScene* pScene, const ColladaParser& pPars
 //      ai_assert( resultTrafos.size() > 0);
 
         // build an animation channel for the given node out of these trafo keys
-    if( !resultTrafos.empty() )
-    {
-          aiNodeAnim* dstAnim = new aiNodeAnim;
-          dstAnim->mNodeName = nodeName;
-          dstAnim->mNumPositionKeys = resultTrafos.size();
-          dstAnim->mNumRotationKeys= resultTrafos.size();
-          dstAnim->mNumScalingKeys = resultTrafos.size();
-          dstAnim->mPositionKeys = new aiVectorKey[resultTrafos.size()];
-          dstAnim->mRotationKeys = new aiQuatKey[resultTrafos.size()];
-          dstAnim->mScalingKeys = new aiVectorKey[resultTrafos.size()];
-
-          for( size_t a = 0; a < resultTrafos.size(); ++a)
-          {
-              aiMatrix4x4 mat = resultTrafos[a];
-              double time = double( mat.d4); // remember? time is stored in mat.d4
-        mat.d4 = 1.0f;
-
-              dstAnim->mPositionKeys[a].mTime = time;
-              dstAnim->mRotationKeys[a].mTime = time;
-              dstAnim->mScalingKeys[a].mTime = time;
-              mat.Decompose( dstAnim->mScalingKeys[a].mValue, dstAnim->mRotationKeys[a].mValue, dstAnim->mPositionKeys[a].mValue);
-          }
+        if( !resultTrafos.empty() )
+        {
+              aiNodeAnim* dstAnim = new aiNodeAnim;
+              dstAnim->mNodeName = nodeName;
+              dstAnim->mNumPositionKeys = resultTrafos.size();
+              dstAnim->mNumRotationKeys= resultTrafos.size();
+              dstAnim->mNumScalingKeys = resultTrafos.size();
+              dstAnim->mPositionKeys = new aiVectorKey[resultTrafos.size()];
+              dstAnim->mRotationKeys = new aiQuatKey[resultTrafos.size()];
+              dstAnim->mScalingKeys = new aiVectorKey[resultTrafos.size()];
+
+              for( size_t a = 0; a < resultTrafos.size(); ++a)
+              {
+                  aiMatrix4x4 mat = resultTrafos[a];
+                  double time = double( mat.d4); // remember? time is stored in mat.d4
+                    mat.d4 = 1.0f;
+
+                  dstAnim->mPositionKeys[a].mTime = time;
+                  dstAnim->mRotationKeys[a].mTime = time;
+                  dstAnim->mScalingKeys[a].mTime = time;
+                  mat.Decompose( dstAnim->mScalingKeys[a].mValue, dstAnim->mRotationKeys[a].mValue, dstAnim->mPositionKeys[a].mValue);
+              }
 
-          anims.push_back( dstAnim);
-    } else
-    {
-      DefaultLogger::get()->warn( "Collada loader: found empty animation channel, ignored. Please check your exporter.");
-    }
+              anims.push_back( dstAnim);
+        } else
+        {
+          DefaultLogger::get()->warn( "Collada loader: found empty animation channel, ignored. Please check your exporter.");
+        }
+
+        if( !entries.empty() && entries.front().mTimeAccessor->mCount > 0 )
+        {
+            std::vector<Collada::ChannelEntry> morphChannels;
+            for( std::vector<Collada::ChannelEntry>::iterator it = entries.begin(); it != entries.end(); ++it)
+            {
+                Collada::ChannelEntry& e = *it;
+
+                // skip non-transform types
+                if (e.mTargetId.empty())
+                    continue;
+
+                if (e.mTargetId.find("morph-weights") != std::string::npos)
+                    morphChannels.push_back(e);
+            }
+            if (morphChannels.size() > 0)
+            {
+                // either 1) morph weight animation count should contain morph target count channels
+                // or     2) one channel with morph target count arrays
+                // assume first
+
+                aiMeshMorphAnim *morphAnim = new aiMeshMorphAnim;
+                morphAnim->mName.Set(nodeName);
+
+                std::vector<MorphTimeValues> morphTimeValues;
+
+                int morphAnimChannelIndex = 0;
+                for( std::vector<Collada::ChannelEntry>::iterator it = morphChannels.begin(); it != morphChannels.end(); ++it)
+                {
+                    Collada::ChannelEntry& e = *it;
+                    std::string::size_type apos = e.mTargetId.find('(');
+                    std::string::size_type bpos = e.mTargetId.find(')');
+                    if (apos == std::string::npos || bpos == std::string::npos)
+                        // unknown way to specify weight -> ignore this animation
+                        continue;
+
+                    // weight target can be in format Weight_M_N, Weight_N, WeightN, or some other way
+                    // we ignore the name and just assume the channels are in the right order
+                    for (unsigned int i = 0; i < e.mTimeData->mValues.size(); i++)
+                        insertMorphTimeValue(morphTimeValues, e.mTimeData->mValues.at(i), e.mValueData->mValues.at(i), morphAnimChannelIndex);
+
+                    ++morphAnimChannelIndex;
+                }
+
+                morphAnim->mNumKeys = morphTimeValues.size();
+                morphAnim->mKeys = new aiMeshMorphKey[morphAnim->mNumKeys];
+                for (unsigned int key = 0; key < morphAnim->mNumKeys; key++)
+                {
+                    morphAnim->mKeys[key].mNumValuesAndWeights = morphChannels.size();
+                    morphAnim->mKeys[key].mValues = new unsigned int [morphChannels.size()];
+                    morphAnim->mKeys[key].mWeights = new double [morphChannels.size()];
+
+                    morphAnim->mKeys[key].mTime = morphTimeValues[key].mTime;
+                    for (unsigned int valueIndex = 0; valueIndex < morphChannels.size(); valueIndex++)
+                    {
+                        morphAnim->mKeys[key].mValues[valueIndex] = valueIndex;
+                        morphAnim->mKeys[key].mWeights[valueIndex] = getWeightAtKey(morphTimeValues, key, valueIndex);
+                    }
+                }
+
+                morphAnims.push_back(morphAnim);
+            }
+        }
     }
 
-    if( !anims.empty())
+    if( !anims.empty() || !morphAnims.empty())
     {
         aiAnimation* anim = new aiAnimation;
         anim->mName.Set( pName);
         anim->mNumChannels = anims.size();
-        anim->mChannels = new aiNodeAnim*[anims.size()];
-        std::copy( anims.begin(), anims.end(), anim->mChannels);
+        if (anim->mNumChannels > 0)
+        {
+            anim->mChannels = new aiNodeAnim*[anims.size()];
+            std::copy( anims.begin(), anims.end(), anim->mChannels);
+        }
+        anim->mNumMorphMeshChannels = morphAnims.size();
+        if (anim->mNumMorphMeshChannels > 0)
+        {
+            anim->mMorphMeshChannels = new aiMeshMorphAnim*[anim->mNumMorphMeshChannels];
+            std::copy( morphAnims.begin(), morphAnims.end(), anim->mMorphMeshChannels);
+        }
         anim->mDuration = 0.0f;
         for( size_t a = 0; a < anims.size(); ++a)
         {
-            anim->mDuration = std::max( anim->mDuration, anims[a]->mPositionKeys[anims[a]->mNumPositionKeys-1].mTime);
-            anim->mDuration = std::max( anim->mDuration, anims[a]->mRotationKeys[anims[a]->mNumRotationKeys-1].mTime);
-            anim->mDuration = std::max( anim->mDuration, anims[a]->mScalingKeys[anims[a]->mNumScalingKeys-1].mTime);
+                anim->mDuration = std::max( anim->mDuration, anims[a]->mPositionKeys[anims[a]->mNumPositionKeys-1].mTime);
+                anim->mDuration = std::max( anim->mDuration, anims[a]->mRotationKeys[anims[a]->mNumRotationKeys-1].mTime);
+                anim->mDuration = std::max( anim->mDuration, anims[a]->mScalingKeys[anims[a]->mNumScalingKeys-1].mTime);
+        }
+        for (size_t a = 0; a < morphAnims.size(); ++a)
+        {
+            anim->mDuration = std::max(anim->mDuration, morphAnims[a]->mKeys[morphAnims[a]->mNumKeys-1].mTime);
         }
         anim->mTicksPerSecond = 1;
         mAnims.push_back( anim);
diff --git a/code/ColladaLoader.h b/code/ColladaLoader.h
index 313608c..fc26532 100644
--- a/code/ColladaLoader.h
+++ b/code/ColladaLoader.h
@@ -117,6 +117,8 @@ protected:
     /** Builds meshes for the given node and references them */
     void BuildMeshesForNode( const ColladaParser& pParser, const Collada::Node* pNode,
         aiNode* pTarget);
+		
+    aiMesh *findMesh(std::string meshid);
 
     /** Creates a mesh for the given ColladaMesh face subset and returns the newly created mesh */
     aiMesh* CreateMesh( const ColladaParser& pParser, const Collada::Mesh* pSrcMesh, const Collada::SubMesh& pSubMesh,
@@ -223,6 +225,9 @@ protected:
 
     /** Accumulated meshes for the target scene */
     std::vector<aiMesh*> mMeshes;
+	
+    /** Accumulated morph target meshes */
+    std::vector<aiMesh*> mTargetMeshes;
 
     /** Temporary material list */
     std::vector<std::pair<Collada::Effect*, aiMaterial*> > newMats;
diff --git a/code/ColladaParser.cpp b/code/ColladaParser.cpp
index 527e2ed..ce87476 100644
--- a/code/ColladaParser.cpp
+++ b/code/ColladaParser.cpp
@@ -586,6 +586,12 @@ void ColladaParser::ReadAnimationSampler( Collada::AnimationChannel& pChannel)
                     pChannel.mSourceTimes = source;
                 else if( strcmp( semantic, "OUTPUT") == 0)
                     pChannel.mSourceValues = source;
+                else if( strcmp( semantic, "IN_TANGENT") == 0)
+                    pChannel.mInTanValues = source;
+                else if( strcmp( semantic, "OUT_TANGENT") == 0)
+                    pChannel.mOutTanValues = source;
+                else if( strcmp( semantic, "INTERPOLATION") == 0)
+                    pChannel.mInterpolationValues = source;
 
                 if( !mReader->isEmptyElement())
                     SkipElement();
@@ -648,6 +654,9 @@ void ColladaParser::ReadControllerLibrary()
 // Reads a controller into the given mesh structure
 void ColladaParser::ReadController( Collada::Controller& pController)
 {
+    // initial values
+    pController.mType = Skin;
+    pController.mMethod = Normalized;
     while( mReader->read())
     {
         if( mReader->getNodeType() == irr::io::EXN_ELEMENT)
@@ -655,8 +664,15 @@ void ColladaParser::ReadController( Collada::Controller& pController)
             // two types of controllers: "skin" and "morph". Only the first one is relevant, we skip the other
             if( IsElement( "morph"))
             {
-                // should skip everything inside, so there's no danger of catching elements inbetween
-                SkipElement();
+                pController.mType = Morph;
+                int baseIndex = GetAttribute("source");
+                pController.mMeshId = mReader->getAttributeValue(baseIndex) + 1;
+                int methodIndex = GetAttribute("method");
+                if (methodIndex > 0) {
+                    const char *method = mReader->getAttributeValue(methodIndex);
+                    if (strcmp(method, "RELATIVE") == 0)
+                        pController.mMethod = Relative;
+                }
             }
             else if( IsElement( "skin"))
             {
@@ -694,6 +710,32 @@ void ColladaParser::ReadController( Collada::Controller& pController)
             {
                 ReadControllerWeights( pController);
             }
+            else if ( IsElement( "targets" ))
+            {
+                while (mReader->read()) {
+                    if( mReader->getNodeType() == irr::io::EXN_ELEMENT) {
+                        if ( IsElement( "input")) {
+                            int semanticsIndex = GetAttribute("semantic");
+                            int sourceIndex = GetAttribute("source");
+
+                            const char *semantics = mReader->getAttributeValue(semanticsIndex);
+                            const char *source = mReader->getAttributeValue(sourceIndex);
+                            if (strcmp(semantics, "MORPH_TARGET") == 0) {
+                                pController.mMorphTarget = source + 1;
+                            }
+                            else if (strcmp(semantics, "MORPH_WEIGHT") == 0)
+                            {
+                                pController.mMorphWeight = source + 1;
+                            }
+                        }
+                    } else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END) {
+                        if( strcmp( mReader->getNodeName(), "targets") == 0)
+                            break;
+                        else
+                            ThrowException( "Expected end of <targets> element.");
+                    }
+                }
+            }
             else
             {
                 // ignore the rest
@@ -704,7 +746,7 @@ void ColladaParser::ReadController( Collada::Controller& pController)
         {
             if( strcmp( mReader->getNodeName(), "controller") == 0)
                 break;
-            else if( strcmp( mReader->getNodeName(), "skin") != 0)
+            else if( strcmp( mReader->getNodeName(), "skin") != 0 && strcmp( mReader->getNodeName(), "morph") != 0)
                 ThrowException( "Expected end of <controller> element.");
         }
     }
diff --git a/code/CreateAnimMesh.cpp b/code/CreateAnimMesh.cpp
new file mode 100644
index 0000000..094a414
--- /dev/null
+++ b/code/CreateAnimMesh.cpp
@@ -0,0 +1,92 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (C) 2016 The Qt Company Ltd.
+Copyright (c) 2006-2012, 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.
+---------------------------------------------------------------------------
+*/
+
+#include "CreateAnimMesh.h"
+
+namespace Assimp    {
+
+aiAnimMesh *aiCreateAnimMesh(const aiMesh *mesh)
+{
+    aiAnimMesh *animesh = new aiAnimMesh;
+    animesh->mVertices = NULL;
+    animesh->mNormals = NULL;
+    animesh->mTangents = NULL;
+    animesh->mBitangents = NULL;
+    animesh->mNumVertices = mesh->mNumVertices;
+    if (mesh->mVertices) {
+        animesh->mVertices = new aiVector3D[animesh->mNumVertices];
+        std::memcpy(animesh->mVertices, mesh->mVertices, mesh->mNumVertices * sizeof(aiVector3D));
+    }
+    if (mesh->mNormals) {
+        animesh->mNormals = new aiVector3D[animesh->mNumVertices];
+        std::memcpy(animesh->mNormals, mesh->mNormals, mesh->mNumVertices * sizeof(aiVector3D));
+    }
+    if (mesh->mTangents) {
+        animesh->mTangents = new aiVector3D[animesh->mNumVertices];
+        std::memcpy(animesh->mTangents, mesh->mTangents, mesh->mNumVertices * sizeof(aiVector3D));
+    }
+    if (mesh->mBitangents) {
+        animesh->mBitangents = new aiVector3D[animesh->mNumVertices];
+        std::memcpy(animesh->mBitangents, mesh->mBitangents, mesh->mNumVertices * sizeof(aiVector3D));
+    }
+
+    for (int i = 0; i < AI_MAX_NUMBER_OF_COLOR_SETS; ++i) {
+        if (mesh->mColors[i]) {
+            animesh->mColors[i] = new aiColor4D[animesh->mNumVertices];
+            std::memcpy(animesh->mColors[i], mesh->mColors[i], mesh->mNumVertices * sizeof(aiColor4D));
+        } else {
+            animesh->mColors[i] = NULL;
+        }
+    }
+
+    for (int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
+        if (mesh->mTextureCoords[i]) {
+            animesh->mTextureCoords[i] = new aiVector3D[animesh->mNumVertices];
+            std::memcpy(animesh->mTextureCoords[i], mesh->mTextureCoords[i], mesh->mNumVertices * sizeof(aiVector3D));
+        } else {
+            animesh->mTextureCoords[i] = NULL;
+        }
+    }
+    return animesh;
+}
+
+} // end of namespace Assimp
diff --git a/code/CreateAnimMesh.h b/code/CreateAnimMesh.h
new file mode 100644
index 0000000..c5ceb40
--- /dev/null
+++ b/code/CreateAnimMesh.h
@@ -0,0 +1,56 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2016, 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 CreateAnimMesh.h
+ *  Create AnimMesh from Mesh
+ */
+#ifndef INCLUDED_AI_CREATE_ANIM_MESH_H
+#define INCLUDED_AI_CREATE_ANIM_MESH_H
+
+#include <assimp/mesh.h>
+
+namespace Assimp    {
+
+/** Create aiAnimMesh from aiMesh. */
+aiAnimMesh *aiCreateAnimMesh(const aiMesh *mesh);
+
+} // end of namespace Assimp
+#endif // INCLUDED_AI_CREATE_ANIM_MESH_H
+
diff --git a/include/assimp/anim.h b/include/assimp/anim.h
index af59417..7b4dff8 100644
--- a/include/assimp/anim.h
+++ b/include/assimp/anim.h
@@ -182,6 +182,39 @@ struct aiMeshKey
 };
 
 // ---------------------------------------------------------------------------
+/** Binds a morph anim mesh to a specific point in time. */
+struct aiMeshMorphKey
+{
+    /** The time of this key */
+    double mTime;
+
+    /** The values and weights at the time of this key */
+    unsigned int *mValues;
+    double *mWeights;
+
+    /** The number of values and weights */
+    unsigned int mNumValuesAndWeights;
+#ifdef __cplusplus
+	aiMeshMorphKey()
+		: mTime(0.0)
+		, mValues(NULL)
+		, mWeights(NULL)
+		, mNumValuesAndWeights(0)
+	{
+
+	}
+
+    ~aiMeshMorphKey()
+    {
+        if (mNumValuesAndWeights && mValues && mWeights) {
+            delete [] mValues;
+            delete [] mWeights;
+        }
+    }
+#endif
+};
+
+// ---------------------------------------------------------------------------
 /** Defines how an animation channel behaves outside the defined time
  *  range. This corresponds to aiNodeAnim::mPreState and
  *  aiNodeAnim::mPostState.*/
@@ -335,7 +368,38 @@ struct aiMeshAnim
 };
 
 // ---------------------------------------------------------------------------
-/** An animation consists of keyframe data for a number of nodes. For
+/** Describes a morphing animation of a given mesh. */
+struct aiMeshMorphAnim
+{
+    /** Name of the mesh to be animated. An empty string is not allowed,
+     *  animated meshes need to be named (not necessarily uniquely,
+     *  the name can basically serve as wildcard to select a group
+     *  of meshes with similar animation setup)*/
+    C_STRUCT aiString mName;
+
+    /** Size of the #mKeys array. Must be 1, at least. */
+    unsigned int mNumKeys;
+
+    /** Key frames of the animation. May not be NULL. */
+    C_STRUCT aiMeshMorphKey* mKeys;
+
+#ifdef __cplusplus
+
+    aiMeshMorphAnim()
+        : mNumKeys()
+        , mKeys()
+    {}
+
+    ~aiMeshMorphAnim()
+    {
+        delete[] mKeys;
+    }
+
+#endif
+};
+
+// ---------------------------------------------------------------------------
+/** An animation consists of key-frame data for a number of nodes. For
  *  each node affected by the animation a separate series of data is given.*/
 struct aiAnimation
 {
@@ -367,15 +431,25 @@ struct aiAnimation
      *  The array is mNumMeshChannels in size. */
     C_STRUCT aiMeshAnim** mMeshChannels;
 
+    /** The number of mesh animation channels. Each channel affects
+     *  a single mesh and defines morphing animation. */
+    unsigned int mNumMorphMeshChannels;
+
+    /** The morph mesh animation channels. Each channel affects a single mesh.
+     *  The array is mNumMorphMeshChannels in size. */
+    C_STRUCT aiMeshMorphAnim **mMorphMeshChannels;
+
 #ifdef __cplusplus
     aiAnimation()
-        : mDuration(-1.)
-        , mTicksPerSecond()
-        , mNumChannels()
-        , mChannels()
-        , mNumMeshChannels()
-        , mMeshChannels()
-    {
+    : mDuration(-1.)
+    , mTicksPerSecond(0.)
+    , mNumChannels(0)
+    , mChannels(NULL)
+    , mNumMeshChannels(0)
+    , mMeshChannels(NULL)
+    , mNumMorphMeshChannels(0)
+    , mMorphMeshChannels(NULL) {
+        // empty
     }
 
     ~aiAnimation()
@@ -395,6 +469,11 @@ struct aiAnimation
 
         delete [] mMeshChannels;
         }
+        if (mNumMorphMeshChannels && mMorphMeshChannels) {
+                for( unsigned int a = 0; a < mNumMorphMeshChannels; a++) {
+                        delete mMorphMeshChannels[a];
+                }
+        }
     }
 #endif // __cplusplus
 };
diff --git a/include/assimp/mesh.h b/include/assimp/mesh.h
index a76a2d7..2ebc14d 100644
--- a/include/assimp/mesh.h
+++ b/include/assimp/mesh.h
@@ -377,6 +377,9 @@ struct aiAnimMesh
      */
     unsigned int mNumVertices;
 
+/** Weight of the AnimMesh. */
+    float mWeight;
+
 #ifdef __cplusplus
 
     aiAnimMesh()
@@ -445,6 +448,27 @@ struct aiAnimMesh
 #endif
 };
 
+// ---------------------------------------------------------------------------
+/** @brief Enumerates the methods of mesh morphing supported by Assimp.
+ */
+enum aiMorphingMethod
+{
+    /** Interpolation between morph targets */
+    aiMorphingMethod_VERTEX_BLEND       = 0x1,
+
+    /** Normalized morphing between morph targets  */
+    aiMorphingMethod_MORPH_NORMALIZED   = 0x2,
+
+    /** Relative morphing between morph targets  */
+    aiMorphingMethod_MORPH_RELATIVE     = 0x3,
+
+    /** This value is not used. It is just here to force the
+     *  compiler to map this enum to a 32 Bit integer.
+     */
+#ifndef SWIG
+    _aiMorphingMethod_Force32Bit = INT_MAX
+#endif
+}; //! enum aiMorphingMethod
 
 // ---------------------------------------------------------------------------
 /** @brief A mesh represents a geometry or model with a single material.
@@ -599,15 +623,18 @@ struct aiMesh
     C_STRUCT aiString mName;
 
 
-    /** NOT CURRENTLY IN USE. The number of attachment meshes */
+    /** The number of attachment meshes. Note! Currently only works with Collada loader. */
     unsigned int mNumAnimMeshes;
 
-    /** NOT CURRENTLY IN USE. Attachment meshes for this mesh, for vertex-based animation.
+    /** Attachment meshes for this mesh, for vertex-based animation.
      *  Attachment meshes carry replacement data for some of the
-     *  mesh'es vertex components (usually positions, normals). */
+     *  mesh'es vertex components (usually positions, normals).
+     *  Note! Currently only works with Collada loader.*/
     C_STRUCT aiAnimMesh** mAnimMeshes;
 
-
+    /** Method of morphing when animeshes are specified. */
+    unsigned int mMethod;
+	
 #ifdef __cplusplus
 
     //! Default constructor. Initializes all members to 0
@@ -732,7 +759,6 @@ struct aiMesh
 #endif // __cplusplus
 };
 
-
 #ifdef __cplusplus
 }
 #endif //! extern "C"
-- 
2.9.3

