assimp/code/3DSConverter.cpp

/*
---------------------------------------------------------------------------
Open Asset Import Library (ASSIMP)
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Copyright (c) 2006-2008, ASSIMP Development Team

All rights reserved.

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* 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
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  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

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*/

/** @file Implementation of the 3ds importer class */
#include "3DSLoader.h"
#include "MaterialSystem.h"
#include "TextureTransform.h"
#include "StringComparison.h"

#include "../include/DefaultLogger.h"
#include "../include/IOStream.h"
#include "../include/IOSystem.h"
#include "../include/aiMesh.h"
#include "../include/aiScene.h"
#include "../include/aiAssert.h"

#include <boost/scoped_ptr.hpp>

using namespace Assimp;


// ------------------------------------------------------------------------------------------------
void Dot3DSImporter::ReplaceDefaultMaterial()
{
	// try to find an existing material that matches the
	// typical default material setting:
	// - no textures
	// - diffuse color (in grey!)
	// NOTE: This is here to workaround the fact that some
	// exporters are writing a default material, too.
	unsigned int iIndex = 0xcdcdcdcd;
	for (unsigned int i = 0; i < this->mScene->mMaterials.size();++i)
	{
	if (std::string::npos == this->mScene->mMaterials[i].mName.find("default") &&
		std::string::npos == this->mScene->mMaterials[i].mName.find("DEFAULT"))continue;

	if (this->mScene->mMaterials[i].mDiffuse.r !=
		this->mScene->mMaterials[i].mDiffuse.g ||
		this->mScene->mMaterials[i].mDiffuse.r !=
		this->mScene->mMaterials[i].mDiffuse.b)continue;

	if (this->mScene->mMaterials[i].sTexDiffuse.mMapName.length() != 0	||
		this->mScene->mMaterials[i].sTexBump.mMapName.length()!= 0		|| 
		this->mScene->mMaterials[i].sTexOpacity.mMapName.length() != 0	||
		this->mScene->mMaterials[i].sTexEmissive.mMapName.length() != 0	||
		this->mScene->mMaterials[i].sTexSpecular.mMapName.length() != 0	||
		this->mScene->mMaterials[i].sTexShininess.mMapName.length() != 0 )continue;

	iIndex = i;
	}
	if (0xcdcdcdcd == iIndex)iIndex = (unsigned int)this->mScene->mMaterials.size();

	// now iterate through all meshes and through all faces and
	// find all faces that are using the default material
	unsigned int iCnt = 0;
	for (std::vector<Dot3DS::Mesh>::iterator
		i =  this->mScene->mMeshes.begin();
		i != this->mScene->mMeshes.end();++i)
	{
		for (std::vector<unsigned int>::iterator
			a =  (*i).mFaceMaterials.begin();
			a != (*i).mFaceMaterials.end();++a)
		{
			// NOTE: The additional check seems to be necessary,
			// some exporters seem to generate invalid data here
			if (0xcdcdcdcd == (*a))
			{
				(*a) = iIndex;
				++iCnt;
			}
			else if ( (*a) >= this->mScene->mMaterials.size())
			{
				(*a) = iIndex;
				++iCnt;
				DefaultLogger::get()->warn("Material index overflow in 3DS file. Assigning "
					"default material ...");
			}
		}
	}
	if (iCnt && iIndex == this->mScene->mMaterials.size())
	{
		// we need to create our own default material
		Dot3DS::Material sMat;
		sMat.mDiffuse = aiColor3D(0.3f,0.3f,0.3f);
		sMat.mName = "%%%DEFAULT";
		this->mScene->mMaterials.push_back(sMat);
	}
	return;
}
// ------------------------------------------------------------------------------------------------
void Dot3DSImporter::CheckIndices(Dot3DS::Mesh* sMesh)
{
	for (std::vector< Dot3DS::Face >::iterator
		 i =  sMesh->mFaces.begin();
		 i != sMesh->mFaces.end();++i)
	{
		// check whether all indices are in range
		if ((*i).mIndices[0] >= sMesh->mPositions.size())
		{
			DefaultLogger::get()->warn("Face index overflow in 3DS file (#1)");
			(*i).mIndices[0] = (uint32_t)sMesh->mPositions.size()-1;
		}
		if ((*i).mIndices[1] >= sMesh->mPositions.size())
		{
			DefaultLogger::get()->warn("Face index overflow in 3DS file (#2)");
			(*i).mIndices[1] = (uint32_t)sMesh->mPositions.size()-1;
		}
		if ((*i).mIndices[2] >= sMesh->mPositions.size())
		{
			DefaultLogger::get()->warn("Face index overflow in 3DS file (#3)");
			(*i).mIndices[2] = (uint32_t)sMesh->mPositions.size()-1;
		}
	}
	return;
}
// ------------------------------------------------------------------------------------------------
void Dot3DSImporter::MakeUnique(Dot3DS::Mesh* sMesh)
{
	std::vector<aiVector3D> vNew;
	vNew.resize(sMesh->mFaces.size() * 3);

	std::vector<aiVector2D> vNew2;

	// TODO: Remove this step. By maintaining a small LUT it
	// would be possible to do this directly in the parsing step
	unsigned int iBase = 0;

	if (0 != sMesh->mTexCoords.size())
	{
		vNew2.resize(sMesh->mFaces.size() * 3);
		for (unsigned int i = 0; i < sMesh->mFaces.size();++i)
		{
			uint32_t iTemp1,iTemp2;

			// position and texture coordinates
			vNew[iBase]   = sMesh->mPositions[sMesh->mFaces[i].mIndices[2]];
			vNew2[iBase]   = sMesh->mTexCoords[sMesh->mFaces[i].mIndices[2]];
			iTemp1 = iBase++;

			vNew[iBase]   = sMesh->mPositions[sMesh->mFaces[i].mIndices[1]];
			vNew2[iBase]   = sMesh->mTexCoords[sMesh->mFaces[i].mIndices[1]];
			iTemp2 = iBase++;

			vNew[iBase]   = sMesh->mPositions[sMesh->mFaces[i].mIndices[0]];
			vNew2[iBase]   = sMesh->mTexCoords[sMesh->mFaces[i].mIndices[0]];
			sMesh->mFaces[i].mIndices[2] = iBase++;

			sMesh->mFaces[i].mIndices[0] = iTemp1;
			sMesh->mFaces[i].mIndices[1] = iTemp2;
		}
	}
	else
	{
		for (unsigned int i = 0; i < sMesh->mFaces.size();++i)
		{
			uint32_t iTemp1,iTemp2;

			// position only
			vNew[iBase]   = sMesh->mPositions[sMesh->mFaces[i].mIndices[2]];
			iTemp1 = iBase++;

			vNew[iBase]   = sMesh->mPositions[sMesh->mFaces[i].mIndices[1]];
			iTemp2 = iBase++;

			vNew[iBase]   = sMesh->mPositions[sMesh->mFaces[i].mIndices[0]];
			sMesh->mFaces[i].mIndices[2] = iBase++;

			sMesh->mFaces[i].mIndices[0] = iTemp1;
			sMesh->mFaces[i].mIndices[1] = iTemp2;
		}
	}
	sMesh->mPositions = vNew;
	sMesh->mTexCoords = vNew2;
	return;
}
// ------------------------------------------------------------------------------------------------
void Dot3DSImporter::ConvertMaterial(Dot3DS::Material& oldMat,
	MaterialHelper& mat)
{
	// NOTE: Pass the background image to the viewer by bypassing the
	// material system. This is an evil hack, never do it  again!
	if (0 != this->mBackgroundImage.length() && this->bHasBG)
		{
		aiString tex;
		tex.Set( this->mBackgroundImage);
		mat.AddProperty( &tex, AI_MATKEY_GLOBAL_BACKGROUND_IMAGE);

		// be sure this is only done for the first material
		this->mBackgroundImage = std::string("");
		}

	// At first add the base ambient color of the
	// scene to	the material
	oldMat.mAmbient.r += this->mClrAmbient.r;
	oldMat.mAmbient.g += this->mClrAmbient.g;
	oldMat.mAmbient.b += this->mClrAmbient.b;

	aiString name;
	name.Set( oldMat.mName);
	mat.AddProperty( &name, AI_MATKEY_NAME);

	// material colors
	mat.AddProperty( &oldMat.mAmbient, 1, AI_MATKEY_COLOR_AMBIENT);
	mat.AddProperty( &oldMat.mDiffuse, 1, AI_MATKEY_COLOR_DIFFUSE);
	mat.AddProperty( &oldMat.mSpecular, 1, AI_MATKEY_COLOR_SPECULAR);
	mat.AddProperty( &oldMat.mEmissive, 1, AI_MATKEY_COLOR_EMISSIVE);

	// phong shininess and shininess strength
	if (Dot3DS::Dot3DSFile::Phong == oldMat.mShading || 
		Dot3DS::Dot3DSFile::Metal == oldMat.mShading)
	{
		if (!oldMat.mSpecularExponent || !oldMat.mShininessStrength)
		{
			oldMat.mShading = Dot3DS::Dot3DSFile::Gouraud;
		}
		else
		{
			mat.AddProperty( &oldMat.mSpecularExponent, 1, AI_MATKEY_SHININESS);
			mat.AddProperty( &oldMat.mShininessStrength, 1, AI_MATKEY_SHININESS_STRENGTH);
		}
	}

	// opacity
	mat.AddProperty<float>( &oldMat.mTransparency,1,AI_MATKEY_OPACITY);

	// bump height scaling
	mat.AddProperty<float>( &oldMat.mBumpHeight,1,AI_MATKEY_BUMPSCALING);

	// two sided rendering?
	if (oldMat.mTwoSided)
	{
		int i = 0;
		mat.AddProperty<int>(&i,1,AI_MATKEY_TWOSIDED);
	}

	// shading mode
	aiShadingMode eShading = aiShadingMode_NoShading;
	switch (oldMat.mShading)
	{
		case Dot3DS::Dot3DSFile::Flat:
			eShading = aiShadingMode_Flat; break;

		// I don't know what "Wire" shading should be,
		// assume it is simple lambertian diffuse (L dot N) shading
		case Dot3DS::Dot3DSFile::Wire:
		case Dot3DS::Dot3DSFile::Gouraud:
			eShading = aiShadingMode_Gouraud; break;

		// assume cook-torrance shading for metals.
		// NOTE: I assume the real shader inside 3ds max is an anisotropic
		// Phong-Blinn shader, but this is a good approximation too
		case Dot3DS::Dot3DSFile::Phong :
			eShading = aiShadingMode_Phong; break;

		case Dot3DS::Dot3DSFile::Metal :
			eShading = aiShadingMode_CookTorrance; break;
	}
	mat.AddProperty<int>( (int*)&eShading,1,AI_MATKEY_SHADING_MODEL);

	if (Dot3DS::Dot3DSFile::Wire == oldMat.mShading)
	{
		// set the wireframe flag
		unsigned int iWire = 1;
		mat.AddProperty<int>( (int*)&iWire,1,AI_MATKEY_ENABLE_WIREFRAME);
	}

	// texture, if there is one
	if( oldMat.sTexDiffuse.mMapName.length() > 0)
	{
		aiString tex;
		tex.Set( oldMat.sTexDiffuse.mMapName);
		mat.AddProperty( &tex, AI_MATKEY_TEXTURE_DIFFUSE(0));

		if (is_not_qnan(oldMat.sTexDiffuse.mTextureBlend))
			mat.AddProperty<float>( &oldMat.sTexDiffuse.mTextureBlend, 1, AI_MATKEY_TEXBLEND_DIFFUSE(0));

		if (aiTextureMapMode_Clamp != oldMat.sTexDiffuse.mMapMode)
		{
			int i = (int)oldMat.sTexSpecular.mMapMode;
			mat.AddProperty<int>(&i,1,AI_MATKEY_MAPPINGMODE_U_DIFFUSE(0));
			mat.AddProperty<int>(&i,1,AI_MATKEY_MAPPINGMODE_V_DIFFUSE(0));
		}
	}
	if( oldMat.sTexSpecular.mMapName.length() > 0)
	{
		aiString tex;
		tex.Set( oldMat.sTexSpecular.mMapName);
		mat.AddProperty( &tex, AI_MATKEY_TEXTURE_SPECULAR(0));

		if (is_not_qnan(oldMat.sTexSpecular.mTextureBlend))
			mat.AddProperty<float>( &oldMat.sTexSpecular.mTextureBlend, 1, AI_MATKEY_TEXBLEND_SPECULAR(0));

		if (aiTextureMapMode_Clamp != oldMat.sTexSpecular.mMapMode)
		{
			int i = (int)oldMat.sTexSpecular.mMapMode;
			mat.AddProperty<int>(&i,1,AI_MATKEY_MAPPINGMODE_U_SPECULAR(0));
			mat.AddProperty<int>(&i,1,AI_MATKEY_MAPPINGMODE_V_SPECULAR(0));
		}
	}
	if( oldMat.sTexOpacity.mMapName.length() > 0)
	{
		aiString tex;
		tex.Set( oldMat.sTexOpacity.mMapName);
		mat.AddProperty( &tex, AI_MATKEY_TEXTURE_OPACITY(0));

		if (is_not_qnan(oldMat.sTexOpacity.mTextureBlend))
			mat.AddProperty<float>( &oldMat.sTexOpacity.mTextureBlend, 1,AI_MATKEY_TEXBLEND_OPACITY(0));
		if (aiTextureMapMode_Clamp != oldMat.sTexOpacity.mMapMode)
		{
			int i = (int)oldMat.sTexOpacity.mMapMode;
			mat.AddProperty<int>(&i,1,AI_MATKEY_MAPPINGMODE_U_OPACITY(0));
			mat.AddProperty<int>(&i,1,AI_MATKEY_MAPPINGMODE_V_OPACITY(0));
		}
	}
	if( oldMat.sTexEmissive.mMapName.length() > 0)
	{
		aiString tex;
		tex.Set( oldMat.sTexEmissive.mMapName);
		mat.AddProperty( &tex, AI_MATKEY_TEXTURE_EMISSIVE(0));

		if (is_not_qnan(oldMat.sTexEmissive.mTextureBlend))
			mat.AddProperty<float>( &oldMat.sTexEmissive.mTextureBlend, 1, AI_MATKEY_TEXBLEND_EMISSIVE(0));
		if (aiTextureMapMode_Clamp != oldMat.sTexEmissive.mMapMode)
		{
			int i = (int)oldMat.sTexEmissive.mMapMode;
			mat.AddProperty<int>(&i,1,AI_MATKEY_MAPPINGMODE_U_EMISSIVE(0));
			mat.AddProperty<int>(&i,1,AI_MATKEY_MAPPINGMODE_V_EMISSIVE(0));
		}
	}
	if( oldMat.sTexBump.mMapName.length() > 0)
	{
		aiString tex;
		tex.Set( oldMat.sTexBump.mMapName);
		mat.AddProperty( &tex, AI_MATKEY_TEXTURE_HEIGHT(0));

		if (is_not_qnan(oldMat.sTexBump.mTextureBlend))
			mat.AddProperty<float>( &oldMat.sTexBump.mTextureBlend, 1, AI_MATKEY_TEXBLEND_HEIGHT(0));
		if (aiTextureMapMode_Clamp != oldMat.sTexBump.mMapMode)
		{
			int i = (int)oldMat.sTexBump.mMapMode;
			mat.AddProperty<int>(&i,1,AI_MATKEY_MAPPINGMODE_U_HEIGHT(0));
			mat.AddProperty<int>(&i,1,AI_MATKEY_MAPPINGMODE_V_HEIGHT(0));
		}
	}
	if( oldMat.sTexShininess.mMapName.length() > 0)
	{
		aiString tex;
		tex.Set( oldMat.sTexShininess.mMapName);
		mat.AddProperty( &tex, AI_MATKEY_TEXTURE_SHININESS(0));

		if (is_not_qnan(oldMat.sTexShininess.mTextureBlend))
			mat.AddProperty<float>( &oldMat.sTexShininess.mTextureBlend, 1, AI_MATKEY_TEXBLEND_SHININESS(0));
		if (aiTextureMapMode_Clamp != oldMat.sTexShininess.mMapMode)
		{
			int i = (int)oldMat.sTexShininess.mMapMode;
			mat.AddProperty<int>(&i,1,AI_MATKEY_MAPPINGMODE_U_SHININESS(0));
			mat.AddProperty<int>(&i,1,AI_MATKEY_MAPPINGMODE_V_SHININESS(0));
		}
	}

	// store the name of the material itself, too
	if( oldMat.mName.length() > 0)
	{
		aiString tex;
		tex.Set( oldMat.mName);
		mat.AddProperty( &tex, AI_MATKEY_NAME);
	}
	return;
}
// ------------------------------------------------------------------------------------------------
void Dot3DSImporter::ConvertMeshes(aiScene* pcOut)
{
	std::vector<aiMesh*> avOutMeshes;
	avOutMeshes.reserve(this->mScene->mMeshes.size() * 2);

	unsigned int iFaceCnt = 0;

	// we need to split all meshes by their materials
	for (std::vector<Dot3DS::Mesh>::iterator
		i =  this->mScene->mMeshes.begin();
		i != this->mScene->mMeshes.end();++i)
	{
		std::vector<unsigned int>* aiSplit = new std::vector<unsigned int>[
			this->mScene->mMaterials.size()];

		unsigned int iNum = 0;
		for (std::vector<unsigned int>::const_iterator
			a =  (*i).mFaceMaterials.begin();
			a != (*i).mFaceMaterials.end();++a,++iNum)
		{
		// check range
		if ((*a) >= this->mScene->mMaterials.size())
			{
			// use the last material instead
			aiSplit[this->mScene->mMaterials.size()-1].push_back(iNum);
			}
		else aiSplit[*a].push_back(iNum);
		}
		// now generate submeshes

		bool bFirst = true;
		for (unsigned int p = 0; p < this->mScene->mMaterials.size();++p)
		{
			if (aiSplit[p].size() != 0)
			{
				aiMesh* p_pcOut = new aiMesh();

				// be sure to setup the correct material index
				p_pcOut->mMaterialIndex = p;

				// use the color data as temporary storage
				p_pcOut->mColors[0] = (aiColor4D*)new std::string((*i).mName);
				avOutMeshes.push_back(p_pcOut);


				if (bFirst)
				{
					p_pcOut->mColors[1] = (aiColor4D*)new aiMatrix4x4();

					*((aiMatrix4x4*)p_pcOut->mColors[1]) = (*i).mMat;
					bFirst = false;
				}


				// convert vertices
				p_pcOut->mNumVertices = (unsigned int)aiSplit[p].size()*3;
				p_pcOut->mNumFaces = (unsigned int)aiSplit[p].size();

				// allocate enough storage for faces
				p_pcOut->mFaces = new aiFace[p_pcOut->mNumFaces];
				iFaceCnt += p_pcOut->mNumFaces;

				if (p_pcOut->mNumVertices != 0)
				{
					p_pcOut->mVertices = new aiVector3D[p_pcOut->mNumVertices];
					p_pcOut->mNormals = new aiVector3D[p_pcOut->mNumVertices];
					unsigned int iBase = 0;

					for (unsigned int q = 0; q < aiSplit[p].size();++q)
					{
						unsigned int iIndex = aiSplit[p][q];

						p_pcOut->mFaces[q].mIndices = new unsigned int[3];
						p_pcOut->mFaces[q].mNumIndices = 3;

						p_pcOut->mFaces[q].mIndices[2] = iBase;
						p_pcOut->mVertices[iBase] = (*i).mPositions[(*i).mFaces[iIndex].mIndices[0]];
						p_pcOut->mNormals[iBase++] = (*i).mNormals[(*i).mFaces[iIndex].mIndices[0]];

						p_pcOut->mFaces[q].mIndices[1] = iBase;
						p_pcOut->mVertices[iBase] = (*i).mPositions[(*i).mFaces[iIndex].mIndices[1]];
						p_pcOut->mNormals[iBase++] = (*i).mNormals[(*i).mFaces[iIndex].mIndices[1]];

						p_pcOut->mFaces[q].mIndices[0] = iBase;
						p_pcOut->mVertices[iBase] = (*i).mPositions[(*i).mFaces[iIndex].mIndices[2]];
						p_pcOut->mNormals[iBase++] = (*i).mNormals[(*i).mFaces[iIndex].mIndices[2]];
					}
				}
				// convert texture coordinates
				if ((*i).mTexCoords.size() != 0)
				{
					p_pcOut->mTextureCoords[0] = new aiVector3D[p_pcOut->mNumVertices];

					unsigned int iBase = 0;
					for (unsigned int q = 0; q < aiSplit[p].size();++q)
					{
						unsigned int iIndex2 = aiSplit[p][q];

						unsigned int iIndex = (*i).mFaces[iIndex2].mIndices[0];
						aiVector2D& pc = (*i).mTexCoords[iIndex];
						p_pcOut->mTextureCoords[0][iBase++] = aiVector3D(pc.x,pc.y,0.0f);

						iIndex = (*i).mFaces[iIndex2].mIndices[1];
						pc = (*i).mTexCoords[iIndex];
						p_pcOut->mTextureCoords[0][iBase++] = aiVector3D(pc.x,pc.y,0.0f);

						iIndex = (*i).mFaces[iIndex2].mIndices[2];
						pc = (*i).mTexCoords[iIndex];
						p_pcOut->mTextureCoords[0][iBase++] = aiVector3D(pc.x,pc.y,0.0f);
					}
					// apply texture coordinate scalings
					TextureTransform::BakeScaleNOffset ( p_pcOut, &this->mScene->mMaterials[
						p_pcOut->mMaterialIndex] );
					
					// setup bitflags to indicate which texture coordinate
					// channels are used
					p_pcOut->mNumUVComponents[0] = 2;
					if (p_pcOut->HasTextureCoords(1))
						p_pcOut->mNumUVComponents[1] = 2;
					if (p_pcOut->HasTextureCoords(2))
						p_pcOut->mNumUVComponents[2] = 2;
					if (p_pcOut->HasTextureCoords(3))
						p_pcOut->mNumUVComponents[3] = 2;
				}
			}
		}
		delete[] aiSplit;
	}
	pcOut->mNumMeshes = (unsigned int)avOutMeshes.size();
	pcOut->mMeshes = new aiMesh*[pcOut->mNumMeshes]();
	for (unsigned int a = 0; a < pcOut->mNumMeshes;++a)
	{
		pcOut->mMeshes[a] = avOutMeshes[a];
	}

	if (0 == iFaceCnt)
	{
		throw new ImportErrorException("No faces loaded. The mesh is empty");
	}

	// for each material in the scene we need to setup the UV source
	// set for each texture
	for (unsigned int a = 0; a < pcOut->mNumMaterials;++a)
	{
		TextureTransform::SetupMatUVSrc( pcOut->mMaterials[a], &this->mScene->mMaterials[a] );
	}
	return;
}
// ------------------------------------------------------------------------------------------------
void Dot3DSImporter::AddNodeToGraph(aiScene* pcSOut,aiNode* pcOut,Dot3DS::Node* pcIn)
{
	// find the corresponding mesh indices
	std::vector<unsigned int> iArray;

	if (pcIn->mName != "$$$DUMMY")
	{		
		for (unsigned int a = 0; a < pcSOut->mNumMeshes;++a)
		{
			if (0 == ASSIMP_stricmp(pcIn->mName.c_str(),
				((std::string*)pcSOut->mMeshes[a]->mColors[0])->c_str()))
			{
				iArray.push_back(a);
			}
		}
	}
	pcOut->mName.Set(pcIn->mName);
	pcOut->mNumMeshes = (unsigned int)iArray.size();
	pcOut->mMeshes = new unsigned int[iArray.size()];
	
	for (unsigned int i = 0;i < iArray.size();++i)
	{
		const unsigned int iIndex = iArray[i];

		if (NULL != pcSOut->mMeshes[iIndex]->mColors[1])
		{
			pcOut->mTransformation = *((aiMatrix4x4*)
				(pcSOut->mMeshes[iIndex]->mColors[1]));

			delete (aiMatrix4x4*)pcSOut->mMeshes[iIndex]->mColors[1];
			pcSOut->mMeshes[iIndex]->mColors[1] = NULL;
		}

		pcOut->mMeshes[i] = iIndex;
	}

	// (code for keyframe animation. however, this is currently not supported by Assimp)
#if 0
	// build the scaling matrix. Toggle y and z axis
	aiMatrix4x4 mS;
	mS.a1 = pcIn->vScaling.x;
	mS.b2 = pcIn->vScaling.z;
	mS.c3 = pcIn->vScaling.y;

	// build the translation matrix. Toggle y and z axis
	aiMatrix4x4 mT;
	mT.a4 = pcIn->vPosition.x;
	mT.b4 = pcIn->vPosition.z;
	mT.c4 = pcIn->vPosition.y;

	// build the pivot matrix. Toggle y and z axis
	aiMatrix4x4 mP;
	mP.a4 = -pcIn->vPivot.x;
	mP.b4 = -pcIn->vPivot.z;
	mP.c4 = -pcIn->vPivot.y;


#endif
	// build a matrix to flip the z coordinate of the vertices
	aiMatrix4x4 mF;
	mF.c3 = -1.0f;


	// build the final matrix
	// NOTE: This should be the identity. Theoretically. In reality
	// there are many models with very funny local matrices and
	// very different keyframe values ... this is the only reason
	// why we extract the data from the first keyframe. 
	pcOut->mTransformation = mF; /*   mF * mT * pcIn->mRotation * mS *  mP * 
		pcOut->mTransformation.Inverse(); */

	// (code for keyframe animation. however, this is currently not supported by Assimp)
#if 0
	if (pcOut->mTransformation != mF) 
	{
		DefaultLogger::get()->warn("The local transformation matrix of the "
			"3ds file does not match the first keyframe. Using the "
			"information from the keyframe.");
	}
#endif

	pcOut->mNumChildren = (unsigned int)pcIn->mChildren.size();
	pcOut->mChildren = new aiNode*[pcIn->mChildren.size()];
	for (unsigned int i = 0; i < pcIn->mChildren.size();++i)
	{
		pcOut->mChildren[i] = new aiNode();
		pcOut->mChildren[i]->mParent = pcOut;
		AddNodeToGraph(pcSOut,pcOut->mChildren[i],
			pcIn->mChildren[i]);
	}
	return;
}
// ------------------------------------------------------------------------------------------------
void Dot3DSImporter::GenerateNodeGraph(aiScene* pcOut)
{
	pcOut->mRootNode = new aiNode();

	if (0 == this->mRootNode->mChildren.size())
		{
		// seems the file has not even a hierarchy.
		// generate a flat hiearachy which looks like this:
		//
		//                ROOT_NODE
		//                   |
		//   ----------------------------------------
		//   |       |       |            |
		// MESH_0  MESH_1  MESH_2  ...  MESH_N
		//
		unsigned int iCnt = 0;

		DefaultLogger::get()->warn("No hierarchy information has been "
			"found in the file. A flat hierarchy tree is built ...");

		pcOut->mRootNode->mNumChildren = pcOut->mNumMeshes;
		pcOut->mRootNode->mChildren = new aiNode* [ pcOut->mNumMeshes ];

		for (unsigned int i = 0; i < pcOut->mNumMeshes;++i)
			{
			aiNode* pcNode = new aiNode();
			pcNode->mParent = pcOut->mRootNode;
			pcNode->mNumChildren = 0;
			pcNode->mChildren = 0;
			pcNode->mMeshes = new unsigned int[1];
			pcNode->mMeshes[0] = i;
			pcNode->mNumMeshes = 1;

			std::string s;
			std::stringstream ss(s);
			ss << "UNNAMED[" << i << + "]"; 

			pcNode->mName.Set(s);

			// add the new child to the parent node
			pcOut->mRootNode->mChildren[i] = pcNode;
			}
		}
	else this->AddNodeToGraph(pcOut,  pcOut->mRootNode, this->mRootNode);

	for (unsigned int a = 0; a < pcOut->mNumMeshes;++a)
	{
		delete (std::string*)pcOut->mMeshes[a]->mColors[0];
		pcOut->mMeshes[a]->mColors[0] = NULL;

		// may be NULL
		delete (aiMatrix4x4*)pcOut->mMeshes[a]->mColors[1];
		pcOut->mMeshes[a]->mColors[1] = NULL;
	}
}
// ------------------------------------------------------------------------------------------------
void Dot3DSImporter::ConvertScene(aiScene* pcOut)
{
	pcOut->mNumMaterials = (unsigned int)this->mScene->mMaterials.size();
	pcOut->mMaterials = new aiMaterial*[pcOut->mNumMaterials];

	for (unsigned int i = 0; i < pcOut->mNumMaterials;++i)
	{
		MaterialHelper* pcNew = new MaterialHelper();
		this->ConvertMaterial(this->mScene->mMaterials[i],*pcNew);
		pcOut->mMaterials[i] = pcNew;
	}
	this->ConvertMeshes(pcOut);
	return;
}