assimp/code/ASELoader.cpp

/*
---------------------------------------------------------------------------
Open Asset Import Library (ASSIMP)
---------------------------------------------------------------------------

Copyright (c) 2006-2008, ASSIMP Development Team

All rights reserved.

Redistribution and use of this software in source and binary forms, 
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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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  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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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/

/** @file Implementation of the ASE importer class */
#include "ASELoader.h"
#include "3DSSpatialSort.h"
#include "MaterialSystem.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;
using namespace Assimp::ASE;

#define LOGOUT_WARN(x)

// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
ASEImporter::ASEImporter()
{
}
// ------------------------------------------------------------------------------------------------
// Destructor, private as well 
ASEImporter::~ASEImporter()
{
}
// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool ASEImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler) const
{
	// simple check of file extension is enough for the moment
	std::string::size_type pos = pFile.find_last_of('.');
	// no file extension - can't read
	if( pos == std::string::npos)
		return false;
	std::string extension = pFile.substr( pos);

	if (extension.length() < 4)return false;
	if (extension[0] != '.')return false;

	if (extension[1] != 'a' && extension[1] != 'A')return false;
	if (extension[2] != 's' && extension[2] != 'S')return false;

	// NOTE: Sometimes the extension .ASK is also used
	if (extension[3] != 'e' && extension[3] != 'E' &&
		extension[3] != 'k' && extension[3] != 'K')return false;

	return true;
}
// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void ASEImporter::InternReadFile( 
	const std::string& pFile, aiScene* pScene, IOSystem* pIOHandler)
{
	boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile));

	// Check whether we can read from the file
	if( file.get() == NULL)
	{
		throw new ImportErrorException( "Failed to open ASE file " + pFile + ".");
	}

	size_t fileSize = file->FileSize();

	// allocate storage and copy the contents of the file to a memory buffer
	// (terminate it with zero)
	this->mBuffer = new unsigned char[fileSize+1];
	file->Read( (void*)mBuffer, 1, fileSize);
	this->mBuffer[fileSize] = '\0';

	// construct an ASE parser and parse the file
	this->mParser = new ASE::Parser((const char*)this->mBuffer);
	this->mParser->Parse();

	// process all meshes
	for (std::vector<ASE::Mesh>::iterator
		i =  this->mParser->m_vMeshes.begin();
		i != this->mParser->m_vMeshes.end();++i)
	{
		// need to generate proper vertex normals if necessary
		this->GenerateNormals(*i);

		// now we need to create proper meshes from the import
		// we need to split them by materials, build valid vertex/face lists ...
		this->BuildUniqueRepresentation(*i);
		this->ConvertMeshes(*i,pScene);
	}
	// buil final material indices (remove submaterials and make the final list)
	this->BuildMaterialIndices(pScene);

	// build the final node graph
	this->BuildNodes(pScene);

	// delete the ASE parser
	delete this->mParser;
	this->mParser = NULL;
	return;
}
// ------------------------------------------------------------------------------------------------
void ASEImporter::BuildNodes(aiScene* pcScene)
{
	ai_assert(NULL != pcScene);

	pcScene->mRootNode = new aiNode();
	pcScene->mRootNode->mNumMeshes = pcScene->mNumMeshes;
	pcScene->mRootNode->mMeshes = new unsigned int[pcScene->mRootNode->mNumMeshes];

	for (unsigned int i = 0; i < pcScene->mRootNode->mNumMeshes;++i)
		pcScene->mRootNode->mMeshes[i] = i;

	return;
}
// ------------------------------------------------------------------------------------------------
void ASEImporter::BuildUniqueRepresentation(ASE::Mesh& mesh)
{
	// allocate output storage
	std::vector<aiVector3D> mPositions;
	std::vector<aiVector3D> amTexCoords[AI_MAX_NUMBER_OF_TEXTURECOORDS];
	std::vector<aiColor4D> mVertexColors;
	std::vector<aiVector3D> mNormals;

	unsigned int iSize = mesh.mFaces.size() * 3;
	mPositions.resize(iSize);

	// optional texture coordinates
	for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS;++i)
	{
		if (!mesh.amTexCoords[i].empty())
		{
			amTexCoords[i].resize(iSize);
		}
	}
	// optional vertex colors
	if (!mesh.mVertexColors.empty())
	{
		mVertexColors.resize(iSize);
	}

	// optional vertex normals (vertex normals can simply be copied)
	if (!mesh.mNormals.empty())
	{
		mNormals.resize(iSize);
	}

	// iterate through all faces in the mesh
	unsigned int iCurrent = 0;
	for (std::vector<ASE::Face>::iterator
		i =  mesh.mFaces.begin();
		i != mesh.mFaces.end();++i)
	{
		for (unsigned int n = 0; n < 3;++n,++iCurrent)
		{
			mPositions[iCurrent] = mesh.mPositions[(*i).mIndices[n]];

			// add texture coordinates
			for (unsigned int c = 0; c < AI_MAX_NUMBER_OF_TEXTURECOORDS;++c)
			{
				if (!mesh.amTexCoords[c].empty())
				{
					amTexCoords[c][iCurrent] = mesh.amTexCoords[c][(*i).amUVIndices[c][n]];
				}
			}
			// add vertex colors
			if (!mesh.mVertexColors.empty())
			{
				mVertexColors[iCurrent] = mesh.mVertexColors[(*i).mColorIndices[n]];
			}
			// add normal vectors
			if (!mesh.mNormals.empty())
			{
				mNormals[iCurrent] = mesh.mNormals[(*i).mIndices[n]];
			}
			// assign a new valid index to the face
			(*i).mIndices[n] = iCurrent;
		}
	}

	// replace the old arrays
	mesh.mNormals = mNormals;
	mesh.mPositions = mPositions;
	mesh.mVertexColors = mVertexColors;

	for (unsigned int c = 0; c < AI_MAX_NUMBER_OF_TEXTURECOORDS;++c)
		mesh.amTexCoords[c] = amTexCoords[c];

	return;
}
// ------------------------------------------------------------------------------------------------
void ASEImporter::ConvertMaterial(ASE::Material& mat)
{
	// allocate the output material
	mat.pcInstance = new MaterialHelper();

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

	aiString name;
	name.Set( mat.mName);
	mat.pcInstance->AddProperty( &name, AI_MATKEY_NAME);

	// material colors
	mat.pcInstance->AddProperty( &mat.mAmbient, 1, AI_MATKEY_COLOR_AMBIENT);
	mat.pcInstance->AddProperty( &mat.mDiffuse, 1, AI_MATKEY_COLOR_DIFFUSE);
	mat.pcInstance->AddProperty( &mat.mSpecular, 1, AI_MATKEY_COLOR_SPECULAR);
	mat.pcInstance->AddProperty( &mat.mSpecularExponent, 1, AI_MATKEY_SHININESS);
	mat.pcInstance->AddProperty( &mat.mEmissive, 1, AI_MATKEY_COLOR_EMISSIVE);

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


	// shading mode
	aiShadingMode eShading = aiShadingMode_NoShading;
	switch (mat.mShading)
	{
		case Dot3DS::Dot3DSFile::Flat:
			eShading = aiShadingMode_Flat; break;
		case Dot3DS::Dot3DSFile::Phong :
			eShading = aiShadingMode_Phong; 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;
		case Dot3DS::Dot3DSFile::Metal :
			eShading = aiShadingMode_CookTorrance; break;
	}
	mat.pcInstance->AddProperty<int>( (int*)&eShading,1,AI_MATKEY_SHADING_MODEL);

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

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

		if (is_not_qnan(mat.sTexDiffuse.mTextureBlend))
			mat.pcInstance->AddProperty<float>( &mat.sTexDiffuse.mTextureBlend, 1, 
			AI_MATKEY_TEXBLEND_DIFFUSE(0));
	}
	if( mat.sTexSpecular.mMapName.length() > 0)
	{
		aiString tex;
		tex.Set( mat.sTexSpecular.mMapName);
		mat.pcInstance->AddProperty( &tex, AI_MATKEY_TEXTURE_SPECULAR(0));

		if (is_not_qnan(mat.sTexSpecular.mTextureBlend))
			mat.pcInstance->AddProperty<float>( &mat.sTexSpecular.mTextureBlend, 1,
			AI_MATKEY_TEXBLEND_SPECULAR(0));
	}
	if( mat.sTexOpacity.mMapName.length() > 0)
	{
		aiString tex;
		tex.Set( mat.sTexOpacity.mMapName);
		mat.pcInstance->AddProperty( &tex, AI_MATKEY_TEXTURE_OPACITY(0));

		if (is_not_qnan(mat.sTexOpacity.mTextureBlend))
			mat.pcInstance->AddProperty<float>( &mat.sTexOpacity.mTextureBlend, 1,
			AI_MATKEY_TEXBLEND_OPACITY(0));
	}
	if( mat.sTexEmissive.mMapName.length() > 0)
	{
		aiString tex;
		tex.Set( mat.sTexEmissive.mMapName);
		mat.pcInstance->AddProperty( &tex, AI_MATKEY_TEXTURE_EMISSIVE(0));

		if (is_not_qnan(mat.sTexEmissive.mTextureBlend))
			mat.pcInstance->AddProperty<float>( &mat.sTexEmissive.mTextureBlend, 1, 
			AI_MATKEY_TEXBLEND_EMISSIVE(0));
	}
	if( mat.sTexAmbient.mMapName.length() > 0)
	{
		aiString tex;
		tex.Set( mat.sTexAmbient.mMapName);
		mat.pcInstance->AddProperty( &tex, AI_MATKEY_TEXTURE_AMBIENT(0));

		if (is_not_qnan(mat.sTexAmbient.mTextureBlend))
			mat.pcInstance->AddProperty<float>( &mat.sTexAmbient.mTextureBlend, 1, 
			AI_MATKEY_TEXBLEND_AMBIENT(0));
	}
	if( mat.sTexBump.mMapName.length() > 0)
	{
		aiString tex;
		tex.Set( mat.sTexBump.mMapName);
		mat.pcInstance->AddProperty( &tex, AI_MATKEY_TEXTURE_HEIGHT(0));

		if (is_not_qnan(mat.sTexBump.mTextureBlend))
			mat.pcInstance->AddProperty<float>( &mat.sTexBump.mTextureBlend, 1,
			AI_MATKEY_TEXBLEND_HEIGHT(0));
	}
	if( mat.sTexShininess.mMapName.length() > 0)
	{
		aiString tex;
		tex.Set( mat.sTexShininess.mMapName);
		mat.pcInstance->AddProperty( &tex, AI_MATKEY_TEXTURE_SHININESS(0));

		if (is_not_qnan(mat.sTexShininess.mTextureBlend))
			mat.pcInstance->AddProperty<float>( &mat.sTexBump.mTextureBlend, 1, 
			AI_MATKEY_TEXBLEND_SHININESS(0));
	}

	// store the name of the material itself, too
	if( mat.mName.length() > 0)
	{
		aiString tex;
		tex.Set( mat.mName);
		mat.pcInstance->AddProperty( &tex, AI_MATKEY_NAME);
	}
	return;
}
// ------------------------------------------------------------------------------------------------
void ASEImporter::ConvertMeshes(ASE::Mesh& mesh, aiScene* pcScene)
{
	ai_assert(NULL != pcScene);

	// validate the material index of the mesh
	if (mesh.iMaterialIndex >= this->mParser->m_vMaterials.size())
	{
		mesh.iMaterialIndex = this->mParser->m_vMaterials.size()-1;
		LOGOUT_WARN("Material index is out of range");
	}

	// List of all output meshes
	std::vector<aiMesh*> avOutMeshes;

	// if the material the mesh is assigned to is consisting of submeshes
	// we'll need to split it ... Quak.
	if (!this->mParser->m_vMaterials[mesh.iMaterialIndex].avSubMaterials.empty())
	{
		std::vector<ASE::Material> vSubMaterials = this->mParser->
			m_vMaterials[mesh.iMaterialIndex].avSubMaterials;

		std::vector<unsigned int>* aiSplit = new std::vector<unsigned int>[
			vSubMaterials.size()];

		// build a list of all faces per submaterial
		unsigned int iNum = 0;
		for (unsigned int i = 0; i < mesh.mFaces.size();++i)
		{
			// check range
			if (mesh.mFaces[i].iMaterial >= vSubMaterials.size())
				{
					LOGOUT_WARN("Submaterial index is out of range");

					// use the last material instead
					aiSplit[vSubMaterials.size()-1].push_back(i);
				}
			else aiSplit[mesh.mFaces[i].iMaterial].push_back(i);
		}

		// now generate submeshes
		for (unsigned int p = 0; p < vSubMaterials.size();++p)
		{
			if (aiSplit[p].size() != 0)
			{
				aiMesh* p_pcOut = new aiMesh();

				// let the sub material index
				p_pcOut->mMaterialIndex = p;

				// we will need this material
				this->mParser->m_vMaterials[mesh.iMaterialIndex].avSubMaterials[p].bNeed = true;

				// store the real index here ...
				p_pcOut->mColors[3] = (aiColor4D*)(uintptr_t)mesh.iMaterialIndex;
				avOutMeshes.push_back(p_pcOut);

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

				// allocate enough storage for faces
				p_pcOut->mFaces = new aiFace[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;

						for (unsigned int t = 0; t < 3;++t)
						{
							p_pcOut->mFaces[q].mIndices[t] = iBase;
							p_pcOut->mVertices[iBase] = mesh.mPositions[mesh.mFaces[iIndex].mIndices[t]];
							p_pcOut->mNormals[iBase++] = mesh.mNormals[mesh.mFaces[iIndex].mIndices[t]];
						}
					}
				}
				// convert texture coordinates
				for (unsigned int c = 0; c < AI_MAX_NUMBER_OF_TEXTURECOORDS;++c)
				{
					if (!mesh.amTexCoords[c].empty())
					{
						p_pcOut->mTextureCoords[c] = 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];
							for (unsigned int t = 0; t < 3;++t)
							{
								p_pcOut->mTextureCoords[c][iBase++] = mesh.amTexCoords[c][mesh.mFaces[iIndex].mIndices[t]];
							}
						}
						// setup the number of valid vertex components
						p_pcOut->mNumUVComponents[c] = mesh.mNumUVComponents[c];
					}
				}

				// convert vertex colors (only one set supported)
				if (!mesh.mVertexColors.empty())
				{
					p_pcOut->mColors[0] = new aiColor4D[p_pcOut->mNumVertices];
					unsigned int iBase = 0;
					for (unsigned int q = 0; q < aiSplit[p].size();++q)
					{
						unsigned int iIndex = aiSplit[p][q];
						for (unsigned int t = 0; t < 3;++t)
						{
							p_pcOut->mColors[0][iBase++] = mesh.mVertexColors[mesh.mFaces[iIndex].mIndices[t]];
						}
					}
				}
			}
		}
		// delete storage
		delete[] aiSplit;
	}
	else
	{
		// otherwise we can simply copy the data to one output mesh
		aiMesh* p_pcOut = new aiMesh();

		// set an empty sub material index
		p_pcOut->mMaterialIndex = ASE::Face::DEFAULT_MATINDEX;
		this->mParser->m_vMaterials[mesh.iMaterialIndex].bNeed = true;

		// store the real index here ...
		p_pcOut->mColors[3] = (aiColor4D*)(uintptr_t)mesh.iMaterialIndex;
		avOutMeshes.push_back(p_pcOut);

		// convert vertices
		p_pcOut->mNumVertices = mesh.mPositions.size();
		p_pcOut->mNumFaces = mesh.mFaces.size();

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

		// copy vertices
		p_pcOut->mVertices = new aiVector3D[mesh.mPositions.size()];
		memcpy(p_pcOut->mVertices,&mesh.mPositions[0],
			mesh.mPositions.size() * sizeof(aiVector3D));

		// copy normals
		p_pcOut->mNormals = new aiVector3D[mesh.mNormals.size()];
		memcpy(p_pcOut->mNormals,&mesh.mNormals[0],
			mesh.mNormals.size() * sizeof(aiVector3D));

		// copy texture coordinates
		for (unsigned int c = 0; c < AI_MAX_NUMBER_OF_TEXTURECOORDS;++c)
		{
			if (!mesh.amTexCoords[c].empty())
			{
				p_pcOut->mTextureCoords[c] = new aiVector3D[mesh.amTexCoords[c].size()];
				memcpy(p_pcOut->mTextureCoords[c],&mesh.amTexCoords[c][0],
					mesh.amTexCoords[c].size() * sizeof(aiVector3D));

				// setup the number of valid vertex components
				p_pcOut->mNumUVComponents[c] = mesh.mNumUVComponents[c];
			}
		}

		// copy vertex colors
		if (!mesh.mVertexColors.empty())
		{
			p_pcOut->mColors[0] = new aiColor4D[mesh.mVertexColors.size()];
			memcpy(p_pcOut->mColors[0],&mesh.mVertexColors[0],
				mesh.mVertexColors.size() * sizeof(aiColor4D));
		}

		// copy faces
		for (unsigned int iFace = 0; iFace < p_pcOut->mNumFaces;++iFace)
		{
			p_pcOut->mFaces[iFace].mNumIndices = 3;
			p_pcOut->mFaces[iFace].mIndices = new unsigned int[3];

			// copy indices
			p_pcOut->mFaces[iFace].mIndices[0] = mesh.mFaces[iFace].mIndices[0];
			p_pcOut->mFaces[iFace].mIndices[1] = mesh.mFaces[iFace].mIndices[1];
			p_pcOut->mFaces[iFace].mIndices[2] = mesh.mFaces[iFace].mIndices[2];
		}
	}

	// now build the output mesh list
	pcScene->mNumMeshes = avOutMeshes.size();
	pcScene->mMeshes = new aiMesh*[pcScene->mNumMeshes];
	for (unsigned int i = 0; i < pcScene->mNumMeshes;++i)
		pcScene->mMeshes[i] = avOutMeshes[i];

	return;
}
// ------------------------------------------------------------------------------------------------
void ASEImporter::BuildMaterialIndices(aiScene* pcScene)
{
	ai_assert(NULL != pcScene);

	// iterate through all materials and check whether we need them
	unsigned int iNum = 0;
	for (unsigned int iMat = 0; iMat < this->mParser->m_vMaterials.size();++iMat)
	{
		if (this->mParser->m_vMaterials[iMat].bNeed)
		{
			// convert it to the aiMaterial layout
			this->ConvertMaterial(this->mParser->m_vMaterials[iMat]);
			iNum++;
		}
		for (unsigned int iSubMat = 0; iSubMat < this->mParser->m_vMaterials[
			iMat].avSubMaterials.size();++iSubMat)
		{
			if (this->mParser->m_vMaterials[iMat].avSubMaterials[iSubMat].bNeed)
			{
				// convert it to the aiMaterial layout
				this->ConvertMaterial(this->mParser->m_vMaterials[iMat].avSubMaterials[iSubMat]);
				iNum++;
			}
		}
	}

	// allocate the output material array
	pcScene->mNumMaterials = iNum;
	pcScene->mMaterials = new aiMaterial*[pcScene->mNumMaterials];

	iNum = 0;
	for (unsigned int iMat = 0; iMat < this->mParser->m_vMaterials.size();++iMat)
	{
		if (this->mParser->m_vMaterials[iMat].bNeed)
		{
			ai_assert(NULL != this->mParser->m_vMaterials[iMat].pcInstance);
			pcScene->mMaterials[iNum] = this->mParser->m_vMaterials[iMat].pcInstance;

			// iterate through all meshes and search for one which is using
			// this top-level material index
			for (unsigned int iMesh = 0; iMesh < pcScene->mNumMeshes;++iMesh)
			{
				if (ASE::Face::DEFAULT_MATINDEX == pcScene->mMeshes[iMesh]->mMaterialIndex &&
					iMat == (uintptr_t)pcScene->mMeshes[iMesh]->mColors[3])
				{
					pcScene->mMeshes[iMesh]->mMaterialIndex = iNum;
					pcScene->mMeshes[iMesh]->mColors[3] = NULL;
				}
			}
			iNum++;
		}
		for (unsigned int iSubMat = 0; iSubMat < this->mParser->m_vMaterials[iMat].avSubMaterials.size();++iSubMat)
		{
			if (this->mParser->m_vMaterials[iMat].avSubMaterials[iSubMat].bNeed)
			{
				ai_assert(NULL != this->mParser->m_vMaterials[iMat].avSubMaterials[iSubMat].pcInstance);
				pcScene->mMaterials[iNum] = this->mParser->m_vMaterials[iMat].
					avSubMaterials[iSubMat].pcInstance;

				// iterate through all meshes and search for one which is using
				// this sub-level material index
				for (unsigned int iMesh = 0; iMesh < pcScene->mNumMeshes;++iMesh)
				{
					if (iSubMat == pcScene->mMeshes[iMesh]->mMaterialIndex &&
						iMat == (uintptr_t)pcScene->mMeshes[iMesh]->mColors[3])
					{
						pcScene->mMeshes[iMesh]->mMaterialIndex = iNum;
						pcScene->mMeshes[iMesh]->mColors[3] = NULL;
					}
				}
				iNum++;
			}
		}
	}
	// finished!
	return;
}
// ------------------------------------------------------------------------------------------------
// Generate normal vectors basing on smoothing groups
void ASEImporter::GenerateNormals(ASE::Mesh& mesh)
{
	if (mesh.mNormals.empty())
	{
		// need to calculate normals ... 
		// TODO: Find a way to merge this with the code in 3DSGenNormals.cpp
		mesh.mNormals.resize(mesh.mPositions.size(),aiVector3D());
		for( unsigned int a = 0; a < mesh.mFaces.size(); a++)
		{
			const ASE::Face& face = mesh.mFaces[a];

			// assume it is a triangle
			aiVector3D* pV1 = &mesh.mPositions[face.i1];
			aiVector3D* pV2 = &mesh.mPositions[face.i2];
			aiVector3D* pV3 = &mesh.mPositions[face.i3];

			aiVector3D pDelta1 = *pV2 - *pV1;
			aiVector3D pDelta2 = *pV3 - *pV1;
			aiVector3D vNor = pDelta1 ^ pDelta2;

			mesh.mNormals[face.i1] = vNor;
			mesh.mNormals[face.i2] = vNor;
			mesh.mNormals[face.i3] = vNor;
		}

		// calculate the position bounds so we have a reliable epsilon to 
		// check position differences against 
		// @Schrompf: This is the 7th time this snippet is repeated!
		aiVector3D minVec( 1e10f, 1e10f, 1e10f), maxVec( -1e10f, -1e10f, -1e10f);
		for( unsigned int a = 0; a < mesh.mPositions.size(); a++)
		{
			minVec.x = std::min( minVec.x, mesh.mPositions[a].x);
			minVec.y = std::min( minVec.y, mesh.mPositions[a].y);
			minVec.z = std::min( minVec.z, mesh.mPositions[a].z);
			maxVec.x = std::max( maxVec.x, mesh.mPositions[a].x);
			maxVec.y = std::max( maxVec.y, mesh.mPositions[a].y);
			maxVec.z = std::max( maxVec.z, mesh.mPositions[a].z);
		}
		const float posEpsilon = (maxVec - minVec).Length() * 1e-5f;

		std::vector<aiVector3D> avNormals;
		avNormals.resize(mesh.mNormals.size());

		// now generate the spatial sort tree
		D3DSSpatialSorter sSort;
		for( std::vector<ASE::Face>::iterator
			i =  mesh.mFaces.begin();
			i != mesh.mFaces.end();++i){sSort.AddFace(&(*i),mesh.mPositions);}
		sSort.Prepare();

		for( std::vector<ASE::Face>::iterator
			i =  mesh.mFaces.begin();
			i != mesh.mFaces.end();++i)
		{
			std::vector<unsigned int> poResult;
			for (unsigned int c = 0; c < 3;++c)
			{
				sSort.FindPositions(mesh.mPositions[(*i).mIndices[c]],(*i).iSmoothGroup,
					posEpsilon,poResult);

				aiVector3D vNormals;
				float fDiv = 0.0f;
				for (std::vector<unsigned int>::const_iterator
					a =  poResult.begin();
					a != poResult.end();++a)
				{
					vNormals += mesh.mNormals[(*a)];
					fDiv += 1.0f;
				}
				vNormals.x /= fDiv;vNormals.y /= fDiv;vNormals.z /= fDiv;
				vNormals.Normalize();
				avNormals[(*i).mIndices[c]] = vNormals;
				poResult.clear();
			}
		}
		mesh.mNormals = avNormals;
	}
	return;
}