assimp.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
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  following disclaimer.

* Redistributions in binary form must reproduce the above
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  following disclaimer in the documentation and/or other
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  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 "AssimpPCH.h"

// internal headers
#include "3DSLoader.h"
#include "MaterialSystem.h"
#include "TextureTransform.h"
#include "StringComparison.h"
#include "qnan.h"

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. Using 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
		for (unsigned int a = 0; a < 3;++a)
		{
			if ((*i).mIndices[a] >= sMesh.mPositions.size())
			{
				DefaultLogger::get()->warn("3DS: Face index overflow)");
				(*i).mIndices[a] = (uint32_t)sMesh.mPositions.size()-1;
			}
		}
	}
	return;
}

// ------------------------------------------------------------------------------------------------
void Dot3DSImporter::MakeUnique(Dot3DS::Mesh& sMesh)
{
	unsigned int iBase = 0;

	std::vector<aiVector3D> vNew;
	std::vector<aiVector2D> vNew2;

	vNew.resize(sMesh.mFaces.size() * 3);
	if (sMesh.mTexCoords.size())vNew2.resize(sMesh.mFaces.size() * 3);

	for (unsigned int i = 0; i < sMesh.mFaces.size();++i)
	{
		uint32_t iTemp1,iTemp2;

		// positions
		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]];

		// texture coordinates
		if (sMesh.mTexCoords.size())
		{
			vNew2[iTemp1]   = sMesh.mTexCoords[sMesh.mFaces[i].mIndices[2]];
			vNew2[iTemp2]   = sMesh.mTexCoords[sMesh.mFaces[i].mIndices[1]];
			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;
	}
	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 = 1;
		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.
		case Dot3DS::Dot3DSFile::Phong :
			eShading = aiShadingMode_Phong; break;

		case Dot3DS::Dot3DSFile::Metal :
			eShading = aiShadingMode_CookTorrance; break;

			// FIX to workaround a warning with GCC 4 who complained
			// about a missing case Blinn: here - Blinn isn't a valid
			// value in the 3DS Loader, it is just needed for ASE
		case Dot3DS::Dot3DSFile::Blinn :
			eShading = aiShadingMode_Blinn; 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())
	{
		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)
		{
			aiSplit[*a].push_back(iNum);
		}
		// now generate submeshes
		for (unsigned int p = 0; p < this->mScene->mMaterials.size();++p)
		{
			if (aiSplit[p].size() != 0)
			{
				aiMesh* p_pcOut = new aiMesh();
				p_pcOut->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;

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

				// use the color data as temporary storage
				p_pcOut->mColors[0] = (aiColor4D*)(&*i);
				avOutMeshes.push_back(p_pcOut);
				
				// convert vertices
				p_pcOut->mNumFaces = (unsigned int)aiSplit[p].size();
				p_pcOut->mNumVertices = p_pcOut->mNumFaces*3;

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

				if (p_pcOut->mNumVertices)
				{
					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())
				{
					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] );
				}
			}
		}
		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 (!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)
{
	std::vector<unsigned int> iArray;
	iArray.reserve(3);

	if (pcIn->mName != "$$$DUMMY")
	{		
		for (unsigned int a = 0; a < pcSOut->mNumMeshes;++a)
		{
			const Dot3DS::Mesh* pcMesh = (const Dot3DS::Mesh*)pcSOut->mMeshes[a]->mColors[0];
			ai_assert(NULL != pcMesh);

			// do case independent comparisons here, just for safety
			if (!ASSIMP_stricmp(pcIn->mName,pcMesh->mName))
				iArray.push_back(a);
		}
		if (!iArray.empty())
		{
			aiMatrix4x4& mTrafo = ((Dot3DS::Mesh*)pcSOut->mMeshes[iArray[0]]->mColors[0])->mMat;
			aiMatrix4x4 mInv = mTrafo;
			if (!this->configSkipPivot)
				mInv.Inverse();

			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];
				aiMesh* const mesh = pcSOut->mMeshes[iIndex];

				// http://www.zfx.info/DisplayThread.php?MID=235690#235690
				const aiVector3D& pivot = pcIn->vPivot;
				const aiVector3D* const pvEnd = mesh->mVertices+mesh->mNumVertices;
				aiVector3D* pvCurrent = mesh->mVertices;

				if(pivot.x || pivot.y || pivot.z && !this->configSkipPivot)
				{
					while (pvCurrent != pvEnd)
					{
						*pvCurrent = mInv * (*pvCurrent);
						pvCurrent->x -= pivot.x;
						pvCurrent->y -= pivot.y;
						pvCurrent->z -= pivot.z;
						*pvCurrent = mTrafo * (*pvCurrent);
						//std::swap( pvCurrent->y, pvCurrent->z );
						++pvCurrent;
					}
				}
#if 0
				else
				{
					while (pvCurrent != pvEnd)
					{
						std::swap( pvCurrent->y, pvCurrent->z );
						++pvCurrent;
					}
				}
#endif
				pcOut->mMeshes[i] = iIndex;
			}
		}
	}
	pcOut->mTransformation = aiMatrix4x4(); 
	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
		//
		DefaultLogger::get()->warn("No hierarchy information has been found in the file. ");

		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;

			char szBuffer[128];
			int iLen;
			iLen = sprintf(szBuffer,"UNNAMED_%i",i);
			ai_assert(0 < iLen);
			::memcpy(pcNode->mName.data,szBuffer,iLen);
			pcNode->mName.data[iLen] = '\0';
			pcNode->mName.length = iLen;

			// 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)
		pcOut->mMeshes[a]->mColors[0] = NULL;

	// if the root node has only one child ... set the child as root node
	if (1 == pcOut->mRootNode->mNumChildren)
	{
		aiNode* pcOld = pcOut->mRootNode;
		pcOut->mRootNode = pcOut->mRootNode->mChildren[0];
		pcOut->mRootNode->mParent = NULL;
		pcOld->mChildren[0] = NULL;
		delete pcOld;
	}

	// if the root node is a default node setup a name for it
	if (pcOut->mRootNode->mName.data[0] == '$' && pcOut->mRootNode->mName.data[1] == '$')
		pcOut->mRootNode->mName.Set("<root>");
}
// ------------------------------------------------------------------------------------------------
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;
}