assimp/code/MD5Loader.cpp

/*
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Open Asset Import Library (ASSIMP)
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*/

/** @file  MD5Loader.cpp
 *  @brief Implementation of the MD5 importer class 
 */

#include "AssimpPCH.h"
#ifndef ASSIMP_BUILD_NO_MD5_IMPORTER

// internal headers
#include "MaterialSystem.h"
#include "RemoveComments.h"
#include "MD5Loader.h"
#include "StringComparison.h"
#include "fast_atof.h"
#include "SkeletonMeshBuilder.h"

using namespace Assimp;

// Minimum weight value. Weights inside [-n ... n] are ignored
#define AI_MD5_WEIGHT_EPSILON 1e-5f

// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
MD5Importer::MD5Importer()
: configNoAutoLoad (false)
{}

// ------------------------------------------------------------------------------------------------
// Destructor, private as well 
MD5Importer::~MD5Importer()
{}

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool MD5Importer::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
{
	const std::string extension = GetExtension(pFile);

	if (extension == "md5anim" || extension == "md5mesh" || extension == "md5camera")
		return true;
	else if (!extension.length() || checkSig)	{
		if (!pIOHandler)
			return true;
		const char* tokens[] = {"MD5Version"};
		return SearchFileHeaderForToken(pIOHandler,pFile,tokens,1);
	}
	return false;
}

// ------------------------------------------------------------------------------------------------
// Get list of all supported extensions
void MD5Importer::GetExtensionList(std::set<std::string>& extensions)
{
	extensions.insert("md5anim");
	extensions.insert("md5mesh");
	extensions.insert("md5camera");
}

// ------------------------------------------------------------------------------------------------
// Setup import properties
void MD5Importer::SetupProperties(const Importer* pImp)
{
	// AI_CONFIG_IMPORT_MD5_NO_ANIM_AUTOLOAD
	configNoAutoLoad = (0 !=  pImp->GetPropertyInteger(AI_CONFIG_IMPORT_MD5_NO_ANIM_AUTOLOAD,0));
}

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void MD5Importer::InternReadFile( const std::string& pFile, 
								 aiScene* _pScene, IOSystem* _pIOHandler)
{
	pIOHandler = _pIOHandler;
	pScene     = _pScene;
	bHadMD5Mesh = bHadMD5Anim = bHadMD5Camera = false;

	// remove the file extension
	std::string::size_type pos = pFile.find_last_of('.');
	mFile = (std::string::npos == pos ? pFile : pFile.substr(0,pos+1));

	const std::string extension = GetExtension(pFile);
	try {
		if (extension == "md5camera") {
			LoadMD5CameraFile();
		}
		else if (configNoAutoLoad || extension == "md5anim") {
			// determine file extension and process just *one* file
			if (extension.length() == 0) {
				/* fixme */
			}
			if (extension == "md5anim") {
				LoadMD5AnimFile();
			}
			else if (extension == "md5mesh") {
				LoadMD5MeshFile();
			}
		}
		else {
			LoadMD5MeshFile();
			LoadMD5AnimFile();
		}
	}
	catch ( std::exception&) {
		// XXX use more idiomatic RAII solution
		UnloadFileFromMemory();
		throw;
	}

	// make sure we have at least one file
	if (!bHadMD5Mesh && !bHadMD5Anim && !bHadMD5Camera)
		throw DeadlyImportError("Failed to read valid contents from this MD5* file");

	// Now rotate the whole scene 90 degrees around the x axis to convert to internal coordinate system
	pScene->mRootNode->mTransformation = aiMatrix4x4(1.f,0.f,0.f,0.f,
		0.f,0.f,1.f,0.f,0.f,-1.f,0.f,0.f,0.f,0.f,0.f,1.f);

	// the output scene wouldn't pass the validation without this flag
	if (!bHadMD5Mesh)
		pScene->mFlags |= AI_SCENE_FLAGS_INCOMPLETE;
}

// ------------------------------------------------------------------------------------------------
// Load a file into a memory buffer
void MD5Importer::LoadFileIntoMemory (IOStream* file)
{
	ai_assert(NULL != file);
	fileSize = (unsigned int)file->FileSize();

	// allocate storage and copy the contents of the file to a memory buffer
	pScene = pScene;
	mBuffer = new char[fileSize+1];
	file->Read( (void*)mBuffer, 1, fileSize);
	iLineNumber = 1;

	// append a terminal 0
	mBuffer[fileSize] = '\0';

	// now remove all line comments from the file
	CommentRemover::RemoveLineComments("//",mBuffer,' ');
}

// ------------------------------------------------------------------------------------------------
// Unload the current memory buffer
void MD5Importer::UnloadFileFromMemory ()
{
	// delete the file buffer
	delete[] mBuffer;
	mBuffer = NULL;
	fileSize = 0;
}

// ------------------------------------------------------------------------------------------------
// Build unique vertices
void MD5Importer::MakeDataUnique (MD5::MeshDesc& meshSrc)
{
	std::vector<bool> abHad(meshSrc.mVertices.size(),false);

	// allocate enough storage to keep the output structures
	const unsigned int iNewNum = meshSrc.mFaces.size()*3;
	unsigned int iNewIndex = meshSrc.mVertices.size();
	meshSrc.mVertices.resize(iNewNum);

	// try to guess how much storage we'll need for new weights
	const float fWeightsPerVert = meshSrc.mWeights.size() / (float)iNewIndex;
	const unsigned int guess = (unsigned int)(fWeightsPerVert*iNewNum); 
	meshSrc.mWeights.reserve(guess + (guess >> 3)); // + 12.5% as buffer

	for (FaceList::const_iterator iter = meshSrc.mFaces.begin(),iterEnd = meshSrc.mFaces.end();iter != iterEnd;++iter){
		const aiFace& face = *iter;
		for (unsigned int i = 0; i < 3;++i) {
			if (face.mIndices[0] >= meshSrc.mVertices.size())
				throw DeadlyImportError("MD5MESH: Invalid vertex index");

			if (abHad[face.mIndices[i]])	{
				// generate a new vertex
				meshSrc.mVertices[iNewIndex] = meshSrc.mVertices[face.mIndices[i]];
				face.mIndices[i] = iNewIndex++;
			}
			else abHad[face.mIndices[i]] = true;
		}
		// swap face order
		std::swap(face.mIndices[0],face.mIndices[2]);
	}
}

// ------------------------------------------------------------------------------------------------
// Recursive node graph construction from a MD5MESH
void MD5Importer::AttachChilds_Mesh(int iParentID,aiNode* piParent, BoneList& bones)
{
	ai_assert(NULL != piParent && !piParent->mNumChildren);

	// First find out how many children we'll have
	for (int i = 0; i < (int)bones.size();++i)	{
		if (iParentID != i && bones[i].mParentIndex == iParentID)	{
			++piParent->mNumChildren;
		}
	}
	if (piParent->mNumChildren)	{
		piParent->mChildren = new aiNode*[piParent->mNumChildren];
		for (int i = 0; i < (int)bones.size();++i)	{
			// (avoid infinite recursion)
			if (iParentID != i && bones[i].mParentIndex == iParentID)	{
				aiNode* pc;
				// setup a new node
				*piParent->mChildren++ = pc = new aiNode();
				pc->mName = aiString(bones[i].mName); 
				pc->mParent = piParent;

				// get the transformation matrix from rotation and translational components
				aiQuaternion quat; 
				MD5::ConvertQuaternion ( bones[i].mRotationQuat, quat );

				// FIX to get to Assimp's quaternion conventions
				quat.w *= -1.f;

				bones[i].mTransform = aiMatrix4x4 ( quat.GetMatrix());
				bones[i].mTransform.a4 = bones[i].mPositionXYZ.x;
				bones[i].mTransform.b4 = bones[i].mPositionXYZ.y;
				bones[i].mTransform.c4 = bones[i].mPositionXYZ.z;

				// store it for later use
				pc->mTransformation = bones[i].mInvTransform = bones[i].mTransform;
				bones[i].mInvTransform.Inverse();

				// the transformations for each bone are absolute, so we need to multiply them
				// with the inverse of the absolute matrix of the parent joint
				if (-1 != iParentID)	{
					pc->mTransformation = bones[iParentID].mInvTransform * pc->mTransformation;
				}

				// add children to this node, too
				AttachChilds_Mesh( i, pc, bones);
			}
		}
		// undo offset computations
		piParent->mChildren -= piParent->mNumChildren;
	}
}

// ------------------------------------------------------------------------------------------------
// Recursive node graph construction from a MD5ANIM
void MD5Importer::AttachChilds_Anim(int iParentID,aiNode* piParent, AnimBoneList& bones,const aiNodeAnim** node_anims)
{
	ai_assert(NULL != piParent && !piParent->mNumChildren);

	// First find out how many children we'll have
	for (int i = 0; i < (int)bones.size();++i)	{
		if (iParentID != i && bones[i].mParentIndex == iParentID)	{
			++piParent->mNumChildren;
		}
	}
	if (piParent->mNumChildren)	{
		piParent->mChildren = new aiNode*[piParent->mNumChildren];
		for (int i = 0; i < (int)bones.size();++i)	{
			// (avoid infinite recursion)
			if (iParentID != i && bones[i].mParentIndex == iParentID)
			{
				aiNode* pc;
				// setup a new node
				*piParent->mChildren++ = pc = new aiNode();
				pc->mName = aiString(bones[i].mName); 
				pc->mParent = piParent;

				// get the corresponding animation channel and its first frame
				const aiNodeAnim** cur = node_anims;
				while ((**cur).mNodeName != pc->mName)++cur;

				aiMatrix4x4::Translation((**cur).mPositionKeys[0].mValue,pc->mTransformation);
				pc->mTransformation = pc->mTransformation * aiMatrix4x4((**cur).mRotationKeys[0].mValue.GetMatrix()) ;

				// add children to this node, too
				AttachChilds_Anim( i, pc, bones,node_anims);
			}
		}
		// undo offset computations
		piParent->mChildren -= piParent->mNumChildren;
	}
}

// ------------------------------------------------------------------------------------------------
// Load a MD5MESH file
void MD5Importer::LoadMD5MeshFile ()
{
	std::string pFile = mFile + "md5mesh";
	boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile, "rb"));

	// Check whether we can read from the file
	if( file.get() == NULL)	{
		DefaultLogger::get()->warn("Failed to read MD5MESH file: " + pFile);
		return;
	}
	bHadMD5Mesh = true;
	LoadFileIntoMemory(file.get());

	// now construct a parser and parse the file
	MD5::MD5Parser parser(mBuffer,fileSize);

	// load the mesh information from it
	MD5::MD5MeshParser meshParser(parser.mSections);

	// create the bone hierarchy - first the root node and dummy nodes for all meshes
	pScene->mRootNode = new aiNode("<MD5_Root>");
	pScene->mRootNode->mNumChildren = 2;
	pScene->mRootNode->mChildren = new aiNode*[2];

	// build the hierarchy from the MD5MESH file
	aiNode* pcNode = pScene->mRootNode->mChildren[1] = new aiNode();
	pcNode->mName.Set("<MD5_Hierarchy>");
	pcNode->mParent = pScene->mRootNode;
	AttachChilds_Mesh(-1,pcNode,meshParser.mJoints);

	pcNode = pScene->mRootNode->mChildren[0] = new aiNode();
	pcNode->mName.Set("<MD5_Mesh>");
	pcNode->mParent = pScene->mRootNode;

#if 0
	if (pScene->mRootNode->mChildren[1]->mNumChildren) /* start at the right hierarchy level */
		SkeletonMeshBuilder skeleton_maker(pScene,pScene->mRootNode->mChildren[1]->mChildren[0]);
#else
	std::vector<MD5::MeshDesc>::const_iterator end = meshParser.mMeshes.end();

	// FIX: MD5 files exported from Blender can have empty meshes
	for (std::vector<MD5::MeshDesc>::const_iterator it  = meshParser.mMeshes.begin(),end = meshParser.mMeshes.end(); it != end;++it) {
		if (!(*it).mFaces.empty() && !(*it).mVertices.empty())
			++pScene->mNumMaterials;
	}

	// generate all meshes
	pScene->mNumMeshes = pScene->mNumMaterials;
	pScene->mMeshes = new aiMesh*[pScene->mNumMeshes];
	pScene->mMaterials = new aiMaterial*[pScene->mNumMeshes];

	//  storage for node mesh indices
	pcNode->mNumMeshes = pScene->mNumMeshes;
	pcNode->mMeshes = new unsigned int[pcNode->mNumMeshes];
	for (unsigned int m = 0; m < pcNode->mNumMeshes;++m)
		pcNode->mMeshes[m] = m;

	unsigned int n = 0;
	for (std::vector<MD5::MeshDesc>::iterator it  = meshParser.mMeshes.begin(),end = meshParser.mMeshes.end(); it != end;++it) {
		MD5::MeshDesc& meshSrc = *it;
		if (meshSrc.mFaces.empty() || meshSrc.mVertices.empty())
			continue;

		aiMesh* mesh = pScene->mMeshes[n] = new aiMesh();
		mesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;

		// generate unique vertices in our internal verbose format
		MakeDataUnique(meshSrc);

		mesh->mNumVertices = (unsigned int) meshSrc.mVertices.size();
		mesh->mVertices = new aiVector3D[mesh->mNumVertices];
		mesh->mTextureCoords[0] = new aiVector3D[mesh->mNumVertices];
		mesh->mNumUVComponents[0] = 2;

		// copy texture coordinates
		aiVector3D* pv = mesh->mTextureCoords[0];
		for (MD5::VertexList::const_iterator iter =  meshSrc.mVertices.begin();iter != meshSrc.mVertices.end();++iter,++pv) {
			pv->x = (*iter).mUV.x;
			pv->y = 1.0f-(*iter).mUV.y; // D3D to OpenGL
			pv->z = 0.0f;
		}

		// sort all bone weights - per bone
		unsigned int* piCount = new unsigned int[meshParser.mJoints.size()];
		::memset(piCount,0,sizeof(unsigned int)*meshParser.mJoints.size());

		for (MD5::VertexList::const_iterator iter =  meshSrc.mVertices.begin();iter != meshSrc.mVertices.end();++iter,++pv) {
			for (unsigned int jub = (*iter).mFirstWeight, w = jub; w < jub + (*iter).mNumWeights;++w)
			{
				MD5::WeightDesc& desc = meshSrc.mWeights[w];
				/* FIX for some invalid exporters */
				if (!(desc.mWeight < AI_MD5_WEIGHT_EPSILON && desc.mWeight >= -AI_MD5_WEIGHT_EPSILON ))
					++piCount[desc.mBone]; 
			}
		}

		// check how many we will need
		for (unsigned int p = 0; p < meshParser.mJoints.size();++p)
			if (piCount[p])mesh->mNumBones++;

		if (mesh->mNumBones) // just for safety
		{
			mesh->mBones = new aiBone*[mesh->mNumBones];
			for (unsigned int q = 0,h = 0; q < meshParser.mJoints.size();++q) 
			{
				if (!piCount[q])continue;
				aiBone* p = mesh->mBones[h] = new aiBone();
				p->mNumWeights = piCount[q];
				p->mWeights = new aiVertexWeight[p->mNumWeights];
				p->mName = aiString(meshParser.mJoints[q].mName);
				p->mOffsetMatrix = meshParser.mJoints[q].mInvTransform;

				// store the index for later use
				MD5::BoneDesc& boneSrc = meshParser.mJoints[q];
				boneSrc.mMap = h++;

				// compute w-component of quaternion
				MD5::ConvertQuaternion( boneSrc.mRotationQuat, boneSrc.mRotationQuatConverted );
			}
	
			//unsigned int g = 0;
			pv = mesh->mVertices;
			for (MD5::VertexList::const_iterator iter =  meshSrc.mVertices.begin();iter != meshSrc.mVertices.end();++iter,++pv) {
				// compute the final vertex position from all single weights
				*pv = aiVector3D();

				// there are models which have weights which don't sum to 1 ...
				float fSum = 0.0f;
				for (unsigned int jub = (*iter).mFirstWeight, w = jub; w < jub + (*iter).mNumWeights;++w)
					fSum += meshSrc.mWeights[w].mWeight;
				if (!fSum) {
					DefaultLogger::get()->error("MD5MESH: The sum of all vertex bone weights is 0");
					continue;
				}

				// process bone weights
				for (unsigned int jub = (*iter).mFirstWeight, w = jub; w < jub + (*iter).mNumWeights;++w)	{
					if (w >= meshSrc.mWeights.size())
						throw DeadlyImportError("MD5MESH: Invalid weight index");

					MD5::WeightDesc& desc = meshSrc.mWeights[w];
					if ( desc.mWeight < AI_MD5_WEIGHT_EPSILON && desc.mWeight >= -AI_MD5_WEIGHT_EPSILON)
						continue;

					const float fNewWeight = desc.mWeight / fSum; 

					// transform the local position into worldspace
					MD5::BoneDesc& boneSrc = meshParser.mJoints[desc.mBone];
					const aiVector3D v = boneSrc.mRotationQuatConverted.Rotate (desc.vOffsetPosition);

					// use the original weight to compute the vertex position
					// (some MD5s seem to depend on the invalid weight values ...)
					*pv += ((boneSrc.mPositionXYZ+v)* desc.mWeight);
			
					aiBone* bone = mesh->mBones[boneSrc.mMap];
					*bone->mWeights++ = aiVertexWeight((unsigned int)(pv-mesh->mVertices),fNewWeight);
				}
			}

			// undo our nice offset tricks ...
			for (unsigned int p = 0; p < mesh->mNumBones;++p)
				mesh->mBones[p]->mWeights -= mesh->mBones[p]->mNumWeights;
		}

		delete[] piCount;

		// now setup all faces - we can directly copy the list
		// (however, take care that the aiFace destructor doesn't delete the mIndices array)
		mesh->mNumFaces = (unsigned int)meshSrc.mFaces.size();
		mesh->mFaces = new aiFace[mesh->mNumFaces];
		for (unsigned int c = 0; c < mesh->mNumFaces;++c)	{
			mesh->mFaces[c].mNumIndices = 3;
			mesh->mFaces[c].mIndices = meshSrc.mFaces[c].mIndices;
			meshSrc.mFaces[c].mIndices = NULL;
		}

		// generate a material for the mesh
		MaterialHelper* mat = new MaterialHelper();
		pScene->mMaterials[n] = mat;

		// insert the typical doom3 textures:
		// nnn_local.tga  - normal map
		// nnn_h.tga      - height map
		// nnn_s.tga      - specular map
		// nnn_d.tga      - diffuse map
		if (meshSrc.mShader.length && !strchr(meshSrc.mShader.data,'.')) {
		
			aiString temp(meshSrc.mShader);
			temp.Append("_local.tga");
			mat->AddProperty(&temp,AI_MATKEY_TEXTURE_NORMALS(0));

			temp =  aiString(meshSrc.mShader);
			temp.Append("_s.tga");
			mat->AddProperty(&temp,AI_MATKEY_TEXTURE_SPECULAR(0));

			temp =  aiString(meshSrc.mShader);
			temp.Append("_d.tga");
			mat->AddProperty(&temp,AI_MATKEY_TEXTURE_DIFFUSE(0));

			temp =  aiString(meshSrc.mShader);
			temp.Append("_h.tga");
			mat->AddProperty(&temp,AI_MATKEY_TEXTURE_HEIGHT(0));

			// set this also as material name
			mat->AddProperty(&meshSrc.mShader,AI_MATKEY_NAME);
		}
		else mat->AddProperty(&meshSrc.mShader,AI_MATKEY_TEXTURE_DIFFUSE(0));
		mesh->mMaterialIndex = n++;
	}
#endif
	// delete the file again
	UnloadFileFromMemory();
}

// ------------------------------------------------------------------------------------------------
// Load an MD5ANIM file
void MD5Importer::LoadMD5AnimFile ()
{
	std::string pFile = mFile + "md5anim";
	boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile, "rb"));

	// Check whether we can read from the file
	if( file.get() == NULL)	{
		DefaultLogger::get()->warn("Failed to read MD5ANIM file: " + pFile);
		return;
	}
	LoadFileIntoMemory(file.get());

	// parse the basic file structure
	MD5::MD5Parser parser(mBuffer,fileSize);

	// load the animation information from the parse tree
	MD5::MD5AnimParser animParser(parser.mSections);

	// generate and fill the output animation
	if (animParser.mAnimatedBones.empty() || animParser.mFrames.empty() || 
		animParser.mBaseFrames.size() != animParser.mAnimatedBones.size())	{
		
		DefaultLogger::get()->error("MD5ANIM: No frames or animated bones loaded");
	}
	else {
		bHadMD5Anim = true;

		pScene->mAnimations = new aiAnimation*[pScene->mNumAnimations = 1];
		aiAnimation* anim = pScene->mAnimations[0] = new aiAnimation();
		anim->mNumChannels = (unsigned int)animParser.mAnimatedBones.size();
		anim->mChannels = new aiNodeAnim*[anim->mNumChannels];
		for (unsigned int i = 0; i < anim->mNumChannels;++i)	{
			aiNodeAnim* node = anim->mChannels[i] = new aiNodeAnim();
			node->mNodeName = aiString( animParser.mAnimatedBones[i].mName );

			// allocate storage for the keyframes
			node->mPositionKeys = new aiVectorKey[animParser.mFrames.size()];
			node->mRotationKeys = new aiQuatKey[animParser.mFrames.size()];
		}

		// 1 tick == 1 frame
		anim->mTicksPerSecond = animParser.fFrameRate;

		for (FrameList::const_iterator iter = animParser.mFrames.begin(), iterEnd = animParser.mFrames.end();iter != iterEnd;++iter){
			double dTime = (double)(*iter).iIndex;
			aiNodeAnim** pcAnimNode = anim->mChannels;
			if (!(*iter).mValues.empty() || iter == animParser.mFrames.begin()) /* be sure we have at least one frame */
			{
				// now process all values in there ... read all joints
				MD5::BaseFrameDesc* pcBaseFrame = &animParser.mBaseFrames[0];
				for (AnimBoneList::const_iterator iter2	= animParser.mAnimatedBones.begin(); iter2 != animParser.mAnimatedBones.end();++iter2,
					++pcAnimNode,++pcBaseFrame)
				{
					if((*iter2).iFirstKeyIndex >= (*iter).mValues.size()) {

						// Allow for empty frames
						if ((*iter2).iFlags != 0) {
							throw DeadlyImportError("MD5: Keyframe index is out of range");
						
						}
						continue;
					}
					const float* fpCur = &(*iter).mValues[(*iter2).iFirstKeyIndex];
					aiNodeAnim* pcCurAnimBone = *pcAnimNode;

					aiVectorKey* vKey = &pcCurAnimBone->mPositionKeys[pcCurAnimBone->mNumPositionKeys++];
					aiQuatKey* qKey = &pcCurAnimBone->mRotationKeys  [pcCurAnimBone->mNumRotationKeys++];
					aiVector3D vTemp;

					// translational component
					for (unsigned int i = 0; i < 3; ++i) {
						if ((*iter2).iFlags & (1u << i))
							vKey->mValue[i] =  *fpCur++;
						else vKey->mValue[i] = pcBaseFrame->vPositionXYZ[i];
					}

					// orientation component
					for (unsigned int i = 0; i < 3; ++i) {
						if ((*iter2).iFlags & (8u << i))
							vTemp[i] =  *fpCur++;
						else vTemp[i] = pcBaseFrame->vRotationQuat[i];
					}

					MD5::ConvertQuaternion(vTemp, qKey->mValue);
					qKey->mTime = vKey->mTime = dTime;

					// we need this to get to Assimp quaternion conventions
					qKey->mValue.w *= -1.f;
				}
			}

			// compute the duration of the animation
			anim->mDuration = std::max(dTime,anim->mDuration);
		}

		// If we didn't build the hierarchy yet (== we didn't load a MD5MESH),
		// construct it now from the data given in the MD5ANIM.
		if (!pScene->mRootNode) {
			pScene->mRootNode = new aiNode();
			pScene->mRootNode->mName.Set("<MD5_Hierarchy>");

			AttachChilds_Anim(-1,pScene->mRootNode,animParser.mAnimatedBones,(const aiNodeAnim**)anim->mChannels);

			// Call SkeletonMeshBuilder to construct a mesh to represent the shape
			if (pScene->mRootNode->mNumChildren) {
				SkeletonMeshBuilder skeleton_maker(pScene,pScene->mRootNode->mChildren[0]);
			}
		}
	}
	// delete the file again
	UnloadFileFromMemory();
}

// ------------------------------------------------------------------------------------------------
// Load an MD5CAMERA file
void MD5Importer::LoadMD5CameraFile ()
{
	std::string pFile = mFile + "md5camera";
	boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile, "rb"));

	// Check whether we can read from the file
	if( file.get() == NULL)	{
		throw DeadlyImportError("Failed to read MD5CAMERA file: " + pFile);
	}
	bHadMD5Camera = true;
	LoadFileIntoMemory(file.get());

	// parse the basic file structure
	MD5::MD5Parser parser(mBuffer,fileSize);

	// load the camera animation data from the parse tree
	MD5::MD5CameraParser cameraParser(parser.mSections);

	if (cameraParser.frames.empty())
		throw DeadlyImportError("MD5CAMERA: No frames parsed");

	std::vector<unsigned int>& cuts = cameraParser.cuts;
	std::vector<MD5::CameraAnimFrameDesc>& frames = cameraParser.frames;

	// Construct output graph - a simple root with a dummy child.
	// The root node performs the coordinate system conversion
	aiNode* root = pScene->mRootNode = new aiNode("<MD5CameraRoot>");
	root->mChildren = new aiNode*[root->mNumChildren = 1];
	root->mChildren[0] = new aiNode("<MD5Camera>");
	root->mChildren[0]->mParent = root;

	// ... but with one camera assigned to it
	pScene->mCameras = new aiCamera*[pScene->mNumCameras = 1];
	aiCamera* cam = pScene->mCameras[0] = new aiCamera();
	cam->mName = "<MD5Camera>";

	// FIXME: Fov is currently set to the first frame's value
	cam->mHorizontalFOV = AI_DEG_TO_RAD( frames.front().fFOV );

	// every cut is written to a separate aiAnimation
	if (!cuts.size()) {
		cuts.push_back(0);
		cuts.push_back(frames.size()-1);
	}
	else {		
		cuts.insert(cuts.begin(),0);

		if (cuts.back() < frames.size()-1)
			cuts.push_back(frames.size()-1);
	}

	pScene->mNumAnimations = cuts.size()-1;
	aiAnimation** tmp = pScene->mAnimations = new aiAnimation*[pScene->mNumAnimations];
	for (std::vector<unsigned int>::const_iterator it = cuts.begin(); it != cuts.end()-1; ++it) {
	
		aiAnimation* anim = *tmp++ = new aiAnimation();
		anim->mName.length = ::sprintf(anim->mName.data,"anim%u_from_%u_to_%u",(unsigned int)(it-cuts.begin()),(*it),*(it+1));
		
		anim->mTicksPerSecond = cameraParser.fFrameRate;
		anim->mChannels = new aiNodeAnim*[anim->mNumChannels = 1];
		aiNodeAnim* nd  = anim->mChannels[0] = new aiNodeAnim();
		nd->mNodeName.Set("<MD5Camera>");

		nd->mNumPositionKeys = nd->mNumRotationKeys = *(it+1) - (*it);
		nd->mPositionKeys = new aiVectorKey[nd->mNumPositionKeys];
		nd->mRotationKeys = new aiQuatKey  [nd->mNumRotationKeys];
		for (unsigned int i = 0; i < nd->mNumPositionKeys; ++i) {

			nd->mPositionKeys[i].mValue = frames[*it+i].vPositionXYZ;
			MD5::ConvertQuaternion(frames[*it+i].vRotationQuat,nd->mRotationKeys[i].mValue);
			nd->mRotationKeys[i].mTime = nd->mPositionKeys[i].mTime = *it+i;
		}
	}
}

#endif // !! ASSIMP_BUILD_NO_MD5_IMPORTER