- BUGFIX: ColladaLoader handles multiple UVs/VColors correctly now. Thanks to Ingrater to point it out.

- ScenePreprocessor will now detect 3D UV channels with all-empty third component.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@400 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

code/ColladaHelper.h

@@ -319,8 +319,12 @@ struct Mesh
 			mNumUVComponents[i] = 2;
 	}
 
-	std::string mVertexID; // just to check if there's some sophisticated addressing involved... which we don't support, and therefore should warn about.
-	std::vector<InputChannel> mPerVertexData; // Vertex data addressed by vertex indices
+	// just to check if there's some sophisticated addressing involved...
+	// which we don't support, and therefore should warn about.
+	std::string mVertexID; 
+
+	// Vertex data addressed by vertex indices
+	std::vector<InputChannel> mPerVertexData; 
 
 	// actual mesh data, assembled on encounter of a <p> element. Verbose format, not indexed
 	std::vector<aiVector3D> mPositions;
@@ -332,9 +336,12 @@ struct Mesh
 
 	unsigned int mNumUVComponents[AI_MAX_NUMBER_OF_TEXTURECOORDS];
 
-	// Faces. Stored are only the number of vertices for each face. 1 == point, 2 == line, 3 == triangle, 4+ == poly
+	// Faces. Stored are only the number of vertices for each face.
+	// 1 == point, 2 == line, 3 == triangle, 4+ == poly
 	std::vector<size_t> mFaceSize;
-	// Position indices for all faces in the sequence given in mFaceSize - necessary for bone weight assignment
+	
+	// Position indices for all faces in the sequence given in mFaceSize - 
+	// necessary for bone weight assignment
 	std::vector<size_t> mFacePosIndices;
 
 	// Submeshes in this mesh, each with a given material

code/ColladaLoader.cpp

@@ -547,25 +547,28 @@ aiMesh* ColladaLoader::CreateMesh( const ColladaParser& pParser, const Collada::
 	}
 
 	// same for texturecoords, as many as we have
-	for( size_t a = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; a++)
+	// empty slots are not allowed, need to pack and adjust UV indexes accordingly
+	for( size_t a = 0, real = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; a++)
 	{
 		if( pSrcMesh->mTexCoords[a].size() == pSrcMesh->mPositions.size())
 		{
-			dstMesh->mTextureCoords[a] = new aiVector3D[numVertices];
+			dstMesh->mTextureCoords[real] = new aiVector3D[numVertices];
 			for( size_t b = 0; b < numVertices; ++b)
-				dstMesh->mTextureCoords[a][b] = pSrcMesh->mTexCoords[a][pStartVertex+b];
+				dstMesh->mTextureCoords[real][b] = pSrcMesh->mTexCoords[a][pStartVertex+b];
 			
-			dstMesh->mNumUVComponents[a] = pSrcMesh->mNumUVComponents[a];
+			dstMesh->mNumUVComponents[real] = pSrcMesh->mNumUVComponents[a];
+			++real;
 		}
 	}
 
-	// same for vertex colors, as many as we have
-	for( size_t a = 0; a < AI_MAX_NUMBER_OF_COLOR_SETS; a++)
+	// same for vertex colors, as many as we have. again the same packing to avoid empty slots
+	for( size_t a = 0, real = 0; a < AI_MAX_NUMBER_OF_COLOR_SETS; a++)
 	{
 		if( pSrcMesh->mColors[a].size() == pSrcMesh->mPositions.size())
 		{
-			dstMesh->mColors[a] = new aiColor4D[numVertices];
-			std::copy( pSrcMesh->mColors[a].begin() + pStartVertex, pSrcMesh->mColors[a].begin() + pStartVertex + numVertices, dstMesh->mColors[a]);
+			dstMesh->mColors[real] = new aiColor4D[numVertices];
+			std::copy( pSrcMesh->mColors[a].begin() + pStartVertex, pSrcMesh->mColors[a].begin() + pStartVertex + numVertices,dstMesh->mColors[real]);
+			++real;
 		}
 	}
 
@@ -866,12 +869,12 @@ void ColladaLoader::CreateAnimation( aiScene* pScene, const ColladaParser& pPars
 			}
 
 			// determine which transform step is affected by this channel
-			entry.mTransformIndex = -1;
+			entry.mTransformIndex = 0xffffffff;
 			for( size_t a = 0; a < srcNode->mTransforms.size(); ++a)
 				if( srcNode->mTransforms[a].mID == entry.mTransformId)
 					entry.mTransformIndex = a;
 
-			if( entry.mTransformIndex == -1)
+			if( entry.mTransformIndex == 0xffffffff)
 				continue;
 
 			entry.mChannel = &(*cit);
@@ -1075,20 +1078,19 @@ void ColladaLoader::AddTexture ( Assimp::MaterialHelper& mat, const ColladaParse
 	// UV source index ... if we didn't resolve the mapping it is actually just 
 	// a guess but it works in most cases. We search for the frst occurence of a
 	// number in the channel name. We assume it is the zero-based index into the
-	// UV channel array of all corresponding meshes.
+	// UV channel array of all corresponding meshes. It could also be one-based
+	// for some exporters, but we won't care of it unless someone complains about.
 	if (sampler.mUVId != 0xffffffff)
 		map = sampler.mUVId;
 	else {
-		map = 0xffffffff;
-		for (std::string::const_iterator it = sampler.mUVChannel.begin();
-			it != sampler.mUVChannel.end(); ++it)
-		{
+		map = -1;
+		for (std::string::const_iterator it = sampler.mUVChannel.begin();it != sampler.mUVChannel.end(); ++it){
 			if (IsNumeric(*it)) {
 				map = strtol10(&(*it));
 				break;
 			}
 		}
-		if (0xffffffff == map) {
+		if (-1 == map) {
 			DefaultLogger::get()->warn("Collada: unable to determine UV channel for texture");
 			map = 0;
 		}

code/ColladaParser.cpp

@@ -1800,6 +1800,18 @@ void ColladaParser::ReadInputChannel( std::vector<InputChannel>& poChannels)
 	if( attrOffset > -1)
 		channel.mOffset = mReader->getAttributeValueAsInt( attrOffset);
 
+	// read set if texture coordinates
+	if(channel.mType == IT_Texcoord || channel.mType == IT_Color){
+		int attrSet = TestAttribute("set");
+		if(attrSet > -1){
+			attrSet = mReader->getAttributeValueAsInt( attrSet);
+			if(attrSet < 0)
+				ThrowException( boost::str( boost::format( "Invalid index \"%i\" for set attribute") % (channel.mIndex+1)));
+			
+			channel.mIndex = attrSet;
+		}
+	}
+
 	// store, if valid type
 	if( channel.mType != IT_Invalid)
 		poChannels.push_back( channel);
@@ -1816,7 +1828,7 @@ void ColladaParser::ReadPrimitives( Mesh* pMesh, std::vector<InputChannel>& pPer
 	// determine number of indices coming per vertex 
 	// find the offset index for all per-vertex channels
 	size_t numOffsets = 1;
-	size_t perVertexOffset = -1; // invalid value
+	size_t perVertexOffset = 0xffffffff; // invalid value
 	BOOST_FOREACH( const InputChannel& channel, pPerIndexChannels)
 	{
 		numOffsets = std::max( numOffsets, channel.mOffset+1);
@@ -1946,7 +1958,7 @@ void ColladaParser::ReadPrimitives( Mesh* pMesh, std::vector<InputChannel>& pPer
 		for( size_t b = 0; b < numPoints; b++)
 		{
 			// read all indices for this vertex. Yes, in a hacky static array
-			assert( numOffsets < 20);
+			assert( numOffsets < 20 && perVertexOffset < 20);
 			static size_t vindex[20];
 			for( size_t offsets = 0; offsets < numOffsets; ++offsets)
 				vindex[offsets] = *idx++;
@@ -2017,8 +2029,9 @@ void ColladaParser::ExtractDataObjectFromChannel( const InputChannel& pInput, si
 			break;
 		case IT_Texcoord: // up to 4 texture coord sets are fine, ignore the others
 			if( pInput.mIndex < AI_MAX_NUMBER_OF_TEXTURECOORDS) {
+
 				pMesh->mTexCoords[pInput.mIndex].push_back( aiVector3D( obj[0], obj[1], obj[2]));
-				if (0 != acc.mSubOffset[2]) /* hack ... consider cleaner solution */
+				if (0 != acc.mSubOffset[2] || 0 != acc.mSubOffset[3]) /* hack ... consider cleaner solution */
 					pMesh->mNumUVComponents[pInput.mIndex]=3;
 			}
 			else 

code/ScenePreprocessor.cpp

@@ -121,17 +121,31 @@ void ScenePreprocessor::ProcessMesh (aiMesh* mesh)
 			if( !mesh->mNumUVComponents[i])
 				mesh->mNumUVComponents[i] = 2;
 
+			aiVector3D* p = mesh->mTextureCoords[i], *end = p+mesh->mNumVertices;
+
 			// Ensure unsued components are zeroed. This will make 1D texture channels work
 			// as if they were 2D channels .. just in case an application doesn't handle
 			// this case
 			if (2 == mesh->mNumUVComponents[i]) {
-				for (aiVector3D* p = mesh->mTextureCoords[i], *end = p+mesh->mNumVertices; p != end; ++p)
+				for (; p != end; ++p)
 					p->z = 0.f;
 			}
 			else if (1 == mesh->mNumUVComponents[i]) {
-				for (aiVector3D* p = mesh->mTextureCoords[i], *end = p+mesh->mNumVertices; p != end; ++p)
+				for (; p != end; ++p)
 					p->z = p->y = 0.f;
 			}
+			else if (3 == mesh->mNumUVComponents[i]) {
+			
+				// Really 3D coordinates? Check whether the third coordinate is != 0 for at least one element
+				for (; p != end; ++p) {
+					if (p->z != 0)
+						break;
+				}
+				if (p == end) {
+					DefaultLogger::get()->warn("ScenePreprocessor: UVs are declared to be 3D but they're obviously not. Reverting to 2D.");
+					mesh->mNumUVComponents[i] = 2;
+				}
+			}
 		}
 	}