importObjTex.hpp 32.5 KB
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/*******************************************************************************
* CGoGN: Combinatorial and Geometric modeling with Generic N-dimensional Maps  *
* version 0.1                                                                  *
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* Copyright (C) 2009-2012, IGG Team, LSIIT, University of Strasbourg           *
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*                                                                              *
* This library is free software; you can redistribute it and/or modify it      *
* under the terms of the GNU Lesser General Public License as published by the *
* Free Software Foundation; either version 2.1 of the License, or (at your     *
* option) any later version.                                                   *
*                                                                              *
* This library is distributed in the hope that it will be useful, but WITHOUT  *
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or        *
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License  *
* for more details.                                                            *
*                                                                              *
* You should have received a copy of the GNU Lesser General Public License     *
* along with this library; if not, write to the Free Software Foundation,      *
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.           *
*                                                                              *
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* Web site: http://cgogn.unistra.fr/                                           *
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* Contact information: cgogn@unistra.fr                                        *
*                                                                              *
*******************************************************************************/

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#include "Topology/generic/attributeHandler.h"
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#include "Topology/generic/autoAttributeHandler.h"
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#include "Container/fakeAttribute.h"
#include <fstream>
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#include <algorithm>
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namespace CGoGN
{
namespace Algo
{
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namespace Surface
{
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namespace Import 
{

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template <typename PFP>
OBJModel<PFP>::OBJModel(typename PFP::MAP& map):
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	m_map(map),
	m_tagV(0),m_tagVT(0),m_tagVN(0),m_tagG(0),m_tagF(0),
	m_specialVertices(map),m_dirtyEdges(map)
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{
}

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template <typename PFP>
OBJModel<PFP>::~OBJModel()
{
	for (std::vector<MaterialOBJ*>::iterator it = m_materials.begin(); it != m_materials.end(); ++it)
		delete *it;
}

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template <typename PFP>
inline typename PFP::VEC3 OBJModel<PFP>::getPosition(Dart d)
{
	return m_positions[d];
}
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template <typename PFP>
inline typename PFP::VEC3 OBJModel<PFP>::getNormal(Dart d)
{
	if (m_specialVertices.isMarked(d))
		return m_normalsF[d];
	return m_normals[d];
}


template <typename PFP>
inline Geom::Vec2f OBJModel<PFP>::getTexCoord(Dart d)
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{
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	if (m_specialVertices.isMarked(d))
		return m_texCoordsF[d];
	return m_texCoords[d];
}


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template <typename PFP>
void OBJModel<PFP>::setPositionAttribute(VertexAttribute<Geom::Vec3f> position)
{
	m_positions = position;
}

template <typename PFP>
void OBJModel<PFP>::setNormalAttribute(VertexAttribute<Geom::Vec3f> normal)
{
	m_normals = normal;
}

template <typename PFP>
void OBJModel<PFP>::setTexCoordAttribute(VertexAttribute<Geom::Vec2f>texcoord)
{
	m_texCoords = texcoord;
}


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template <typename PFP>
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void OBJModel<PFP>::readMaterials(unsigned int /*maxTextureSize*/, const std::string& filename)
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{
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	m_materials.reserve(m_materialNames.size());

	if (!filename.empty())
	{
		m_matFileName = filename;
	}

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	// open file
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	std::ifstream fp(m_matFileName.c_str());
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	if (!fp.good())
	{
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		CGoGNerr << "Unable to open file " << m_matFileName << CGoGNendl;
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		return ;
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	}
	
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	MaterialOBJ* currentMat = NULL;

	m_materials.resize(m_materialNames.size(),NULL);
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	std::string ligne;
	do
	{
		std::getline (fp, ligne);
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		std::stringstream oss(ligne);
		std::string tag;
		oss >> tag;
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		if (tag == "newmtl")
		{
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			std::string name;
			oss >> name ;
			std::map<std::string,int>::iterator it = m_materialNames.find(name);
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			if (it ==  m_materialNames.end())
			{
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				CGoGNerr << "Skipping material "<< name << CGoGNendl;
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				do
				{
					fp >> tag;
					
				}while (!fp.eof() && (tag == "new mtl")); 
			}
			else
			{
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				CGoGNout << "Reading material "<< name << CGoGNendl;
				currentMat = new MaterialOBJ();
				m_materials[it->second] = currentMat;
				currentMat->name = name;
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			}
		}
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		else if (currentMat != NULL)
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		{
			if (tag == "Ka")
			{
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				oss >> currentMat->ambiantColor[0];
				oss >> currentMat->ambiantColor[1];
				oss >> currentMat->ambiantColor[2];
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			}
			if (tag == "Kd")
			{
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				oss >> currentMat->diffuseColor[0];
				oss >> currentMat->diffuseColor[1];
				oss >> currentMat->diffuseColor[2];

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			}
			if (tag == "Ks")
			{
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				oss >> currentMat->specularColor[0];
				oss >> currentMat->specularColor[1];
				oss >> currentMat->specularColor[2];
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			}
			if (tag == "Ns")
			{
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				oss >> currentMat->shininess;
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			}
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			if (tag == "Tf")
			{
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				oss >> currentMat->transparentFilter[0];
				oss >> currentMat->transparentFilter[1];
				oss >> currentMat->transparentFilter[2];
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			}

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			if ((tag == "illum"))
			{
				oss >> currentMat->illuminationModel;
			}


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			if ((tag == "Tr") || (tag == "d"))
			{
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				oss >> currentMat->transparency;
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			}
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			if (tag == "map_Kd") // diffuse texture
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			{
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				if (currentMat->textureDiffuse == NULL)
				{
					currentMat->textureDiffuse = new Utils::Texture<2,Geom::Vec3uc>(GL_UNSIGNED_BYTE);
					std::string buff;
					getline (oss, buff);
					std::string tname = buff.substr(buff.find_first_not_of(' '));
					if (tname[tname.length()-1] == '\r')
						tname = tname.substr(0,tname.length()-1);

					currentMat->textureDiffuse->load(m_matPath+tname);
					CGoGNout << "Loading texture "<< m_matPath+tname << " -> "<<std::hex << currentMat->textureDiffuse <<std::dec<<CGoGNendl;
//					currentMat->textureDiffuse->scaleNearest( currentMat->textureDiffuse->newMaxSize(maxTextureSize));
					currentMat->textureDiffuse->setFiltering(GL_LINEAR);
					currentMat->textureDiffuse->setWrapping(GL_REPEAT);
					currentMat->textureDiffuse->update();
				}
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			}
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			if (tag == "map_Ka") // ambiant texture
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			{
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//				CGoGNerr << tag << " not yet supported in OBJ material reading" << CGoGNendl;
				if (currentMat->textureDiffuse == NULL)
				{
					currentMat->textureDiffuse = new Utils::Texture<2,Geom::Vec3uc>(GL_UNSIGNED_BYTE);
					std::string buff;
					getline (oss, buff);
					std::string tname = buff.substr(buff.find_first_not_of(' '));
					if (tname[tname.length()-1] == '\r')
						tname = tname.substr(0,tname.length()-1);
					currentMat->textureDiffuse->load(m_matPath+tname);
					CGoGNout << "Loading texture "<< m_matPath+tname << " -> "<<std::hex << currentMat->textureDiffuse <<std::dec<<CGoGNendl;
					currentMat->textureDiffuse->setFiltering(GL_LINEAR);
					currentMat->textureDiffuse->setWrapping(GL_REPEAT);
					currentMat->textureDiffuse->update();
				}
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			}
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			if (tag == "map_d") // opacity texture
			{
				CGoGNerr << tag << " not yet supported in OBJ material reading" << CGoGNendl;
			}
			if ((tag == "map_bump") || (tag == "bump"))
			{
				CGoGNerr << tag << " not yet supported in OBJ material reading" << CGoGNendl;
			}
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			tag="";
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		}
	}while (!fp.eof());

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	for (std::vector<MaterialOBJ*>::iterator it = m_materials.begin(); it != m_materials.end(); ++it)
	{
		if (*it == NULL)
			CGoGNerr << "Warning missing material in .mtl"<< CGoGNendl;
	}
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}
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template <typename PFP>
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unsigned int OBJModel<PFP>::getMaterialIndex(const std::string& name) const
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{
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	std::map<std::string, int>::iterator it = m_materialNames.find(name);
	if (it != m_materialNames.end())
		return it->second;
	return 0xffffffff;
}


//template <typename PFP>
//bool OBJModel<PFP>::generateBrowsers(std::vector<ContainerBrowser*>& browsers)
//{
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//	browsers.clear();
//	if (m_groupNames.empty())
//		return false;
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//	ContainerBrowserLinked* MBLptr = new ContainerBrowserLinked(m_map,DART);
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//	browsers.push_back(MBLptr);
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//	for (unsigned int i = 1; i<m_groupNames.size(); ++i)
//	{
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//		ContainerBrowser* MBptr = new ContainerBrowserLinked(*MBLptr);
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//		browsers.push_back(MBptr);
//		m_groupMaterialID[i]= m_materialNames[m_groupMaterialNames[i]];
//	}
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//	for (Dart d=m_map.begin(); d!=m_map.end(); m_map.next(d))
//	{
//		unsigned int g = m_groups[d] -1 ; // groups are name from 1
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//		ContainerBrowserLinked* mb = static_cast<ContainerBrowserLinked*>(browsers[g]);
//		mb->pushBack(d.index);
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//	}
//	return true;
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//}
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template <typename PFP>
short OBJModel<PFP>::readObjLine(std::stringstream& oss, std::vector<unsigned int>& indices)
{
	indices.clear();
	
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	unsigned int nb=0;
	while (!oss.eof())  // lecture de tous les indices
	{
		int index;
		oss >> index;

		indices.push_back(index);

		int slash = 0;
		char sep='_';
		do
		{
			oss >> sep;
			if (sep =='/')
				++slash;
		} while ( ((sep=='/') || (sep ==' ')) && !oss.eof() ) ;

		if ((sep>='0') && (sep<='9'))
			oss.seekg(-1,std::ios_base::cur);

		if (slash == 0)
		{
			if (indices.size()%3 == 1)
			{
				indices.push_back(0);
				indices.push_back(0);
			}
			if (indices.size()%3 == 2)
			{
				indices.push_back(0);
			}
			nb++;
		}


		if (slash == 2)
		{
			indices.push_back(0);
		}
	}
	return nb;
}


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template <typename PFP>
unsigned int OBJModel<PFP>::createSimpleVBO_P(Utils::VBO* positionVBO)
{
	TraversorF<typename PFP::MAP> traf(m_map);
	std::vector<Geom::Vec3f> posBuff;
	posBuff.reserve(16384);
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	unsigned int nbtris = 0;
	for (Dart d=traf.begin(); d!= traf.end(); d = traf.next())
	{
		Dart e = m_map.phi1(d);
		Dart f = m_map.phi1(e);
		do
		{
			posBuff.push_back(m_positions[d]);
			posBuff.push_back(m_positions[e]);
			posBuff.push_back(m_positions[f]);
			e=f;
			f = m_map.phi1(e);
			nbtris++;
		}while (f!=d);
	}

	positionVBO->setDataSize(3);
	positionVBO->allocate(posBuff.size());
	Geom::Vec3f* ptrPos = reinterpret_cast<Geom::Vec3f*>(positionVBO->lockPtr());
	memcpy(ptrPos,&posBuff[0],posBuff.size()*sizeof(Geom::Vec3f));
	positionVBO->releasePtr();

	return 3*nbtris;
}
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template <typename PFP>
unsigned int OBJModel<PFP>::createSimpleVBO_PT(Utils::VBO* positionVBO, Utils::VBO* texcoordVBO)
{
	TraversorF<typename PFP::MAP> traf(m_map);
	std::vector<Geom::Vec3f> posBuff;
	std::vector<Geom::Vec2f> TCBuff;
	posBuff.reserve(16384);
	TCBuff.reserve(16384);

	unsigned int nbtris = 0;
	for (Dart d=traf.begin(); d!= traf.end(); d = traf.next())
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	{
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		Dart e = m_map.phi1(d);
		Dart f = m_map.phi1(e);
		do
		{
			posBuff.push_back(m_positions[d]);
			if (m_specialVertices.isMarked(d))
				TCBuff.push_back(m_texCoordsF[d]);
			else
				TCBuff.push_back(m_texCoords[d]);

			posBuff.push_back(m_positions[e]);
			if (m_specialVertices.isMarked(e))
				TCBuff.push_back(m_texCoordsF[e]);
			else
				TCBuff.push_back(m_texCoords[e]);

			posBuff.push_back(m_positions[f]);
			if (m_specialVertices.isMarked(f))
				TCBuff.push_back(m_texCoordsF[f]);
			else
				TCBuff.push_back(m_texCoords[f]);
			e=f;
			f = m_map.phi1(e);
			nbtris++;
		}while (f!=d);
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	}

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	positionVBO->setDataSize(3);
	positionVBO->allocate(posBuff.size());
	Geom::Vec3f* ptrPos = reinterpret_cast<Geom::Vec3f*>(positionVBO->lockPtr());
	memcpy(ptrPos,&posBuff[0],posBuff.size()*sizeof(Geom::Vec3f));
	positionVBO->releasePtr();

	texcoordVBO->setDataSize(2);
	texcoordVBO->allocate(TCBuff.size());
	Geom::Vec2f* ptrTC = reinterpret_cast<Geom::Vec2f*>(texcoordVBO->lockPtr());
	memcpy(ptrTC,&TCBuff[0],TCBuff.size()*sizeof(Geom::Vec2f));
	texcoordVBO->releasePtr();

	return 3*nbtris;
}

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template <typename PFP>
unsigned int OBJModel<PFP>::createSimpleVBO_PN(Utils::VBO* positionVBO, Utils::VBO* normalVBO )
{
	TraversorF<typename PFP::MAP> traf(m_map);
	std::vector<Geom::Vec3f> posBuff;
	std::vector<Geom::Vec2f> normalBuff;
	posBuff.reserve(16384);
	normalBuff.reserve(16384);

	unsigned int nbtris = 0;
	for (Dart d=traf.begin(); d!= traf.end(); d = traf.next())
	{
		Dart e = m_map.phi1(d);
		Dart f = m_map.phi1(e);
		do
		{
			posBuff.push_back(m_positions[d]);
			if (m_specialVertices.isMarked(d))
			{
				normalBuff.push_back(m_normalsF[d]);
			}
			else
			{
				normalBuff.push_back(m_normals[d]);
			}

			posBuff.push_back(m_positions[e]);
			if (m_specialVertices.isMarked(e))
			{
				normalBuff.push_back(m_normalsF[e]);
			}
			else
			{
				normalBuff.push_back(m_normals[e]);
			}

			posBuff.push_back(m_positions[f]);
			if (m_specialVertices.isMarked(f))
			{
				normalBuff.push_back(m_normalsF[f]);
			}
			else
			{
				normalBuff.push_back(m_normals[f]);
			}
			e=f;
			f = m_map.phi1(e);
			nbtris++;
		}while (f!=d);
	}

	positionVBO->setDataSize(3);
	positionVBO->allocate(posBuff.size());
	Geom::Vec3f* ptrPos = reinterpret_cast<Geom::Vec3f*>(positionVBO->lockPtr());
	memcpy(ptrPos,&posBuff[0],posBuff.size()*sizeof(Geom::Vec3f));
	positionVBO->releasePtr();

	normalVBO->setDataSize(3);
	normalVBO->allocate(normalBuff.size());
	Geom::Vec3f* ptrNormal = reinterpret_cast<Geom::Vec3f*>(normalVBO->lockPtr());
	memcpy(ptrNormal, &normalBuff[0], normalBuff.size()*sizeof(Geom::Vec3f));
	normalVBO->releasePtr();


	return 3*nbtris;
}



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template <typename PFP>
unsigned int OBJModel<PFP>::createSimpleVBO_PTN(Utils::VBO* positionVBO, Utils::VBO* texcoordVBO, Utils::VBO* normalVBO )
{
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	if (!m_normals.isValid())
	{
		CGoGNerr << "no normal attribute "<< CGoGNendl;
		return 0;
	}
	if (!m_texCoords.isValid())
	{
		CGoGNerr << "no tex coords attribute "<< CGoGNendl;
		return 0;
	}


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	TraversorF<typename PFP::MAP> traf(m_map);
	std::vector<Geom::Vec3f> posBuff;
	std::vector<Geom::Vec2f> TCBuff;
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	std::vector<Geom::Vec3f> normalBuff;
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	posBuff.reserve(16384);
	TCBuff.reserve(16384);
	normalBuff.reserve(16384);

	unsigned int nbtris = 0;
	for (Dart d=traf.begin(); d!= traf.end(); d = traf.next())
	{
		Dart e = m_map.phi1(d);
		Dart f = m_map.phi1(e);
		do
		{
			posBuff.push_back(m_positions[d]);
			if (m_specialVertices.isMarked(d))
			{
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				if (hasTexCoords())
					TCBuff.push_back(m_texCoordsF[d]);
				else
					TCBuff.push_back(m_texCoords[d]);
				if (hasNormals())
					normalBuff.push_back(m_normalsF[d]);
				else
					normalBuff.push_back(m_normals[d]);
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			}
			else
			{
				TCBuff.push_back(m_texCoords[d]);
				normalBuff.push_back(m_normals[d]);
			}

			posBuff.push_back(m_positions[e]);
			if (m_specialVertices.isMarked(e))
			{
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				if (hasTexCoords())
					TCBuff.push_back(m_texCoordsF[e]);
				else
					TCBuff.push_back(m_texCoords[e]);
				if (hasNormals())
					normalBuff.push_back(m_normalsF[e]);
				else
					normalBuff.push_back(m_normals[e]);
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			}
			else
			{
				TCBuff.push_back(m_texCoords[e]);
				normalBuff.push_back(m_normals[e]);
			}

			posBuff.push_back(m_positions[f]);
			if (m_specialVertices.isMarked(f))
			{
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				if (hasTexCoords())
					TCBuff.push_back(m_texCoordsF[f]);
				else
					TCBuff.push_back(m_texCoords[f]);
				if (hasNormals())
					normalBuff.push_back(m_normalsF[f]);
				else
					normalBuff.push_back(m_normals[f]);
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			}
			else
			{
				TCBuff.push_back(m_texCoords[f]);
				normalBuff.push_back(m_normals[f]);
			}
			e=f;
			f = m_map.phi1(e);
			nbtris++;
		}while (f!=d);
	}

	positionVBO->setDataSize(3);
	positionVBO->allocate(posBuff.size());
	Geom::Vec3f* ptrPos = reinterpret_cast<Geom::Vec3f*>(positionVBO->lockPtr());
	memcpy(ptrPos,&posBuff[0],posBuff.size()*sizeof(Geom::Vec3f));
	positionVBO->releasePtr();

	texcoordVBO->setDataSize(2);
	texcoordVBO->allocate(TCBuff.size());
	Geom::Vec2f* ptrTC = reinterpret_cast<Geom::Vec2f*>(texcoordVBO->lockPtr());
	memcpy(ptrTC,&TCBuff[0],TCBuff.size()*sizeof(Geom::Vec2f));
	texcoordVBO->releasePtr();

	normalVBO->setDataSize(3);
	normalVBO->allocate(normalBuff.size());
	Geom::Vec3f* ptrNormal = reinterpret_cast<Geom::Vec3f*>(normalVBO->lockPtr());
	memcpy(ptrNormal, &normalBuff[0], normalBuff.size()*sizeof(Geom::Vec3f));
	normalVBO->releasePtr();

	return 3*nbtris;
}


template <typename PFP>
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bool OBJModel<PFP>::createGroupMatVBO_P(Utils::VBO* positionVBO)
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{
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	m_beginIndices.clear();
	m_nbIndices.clear();

	std::vector<Geom::Vec3f> posBuff;
	posBuff.reserve(16384);

	std::vector< std::vector<Dart> > group_faces(m_materialNames.size());
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	TraversorF<typename PFP::MAP> traf(m_map);
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	for (Dart d=traf.begin(); d!= traf.end(); d = traf.next())
	{
		unsigned int g = m_attMat[d];
		group_faces[g].push_back(d);
	}

	unsigned int firstIndex = 0;

	unsigned int sz = group_faces.size();
	m_beginIndices.resize(sz);
	m_nbIndices.resize(sz);


	for (unsigned int g=0; g<sz; ++g)
	{
		unsigned int nbtris = 0;
		std::vector<Dart>& traf = group_faces[g];

		for (std::vector<Dart>::iterator id=traf.begin(); id!= traf.end(); ++id)
		{
			Dart d = *id;
			Dart e = m_map.phi1(d);
			Dart f = m_map.phi1(e);
			do
			{
				posBuff.push_back(m_positions[d]);
				posBuff.push_back(m_positions[e]);
				posBuff.push_back(m_positions[f]);
				e=f;
				f = m_map.phi1(e);
				nbtris++;
			}while (f!=d);
		}
		m_beginIndices[g] = firstIndex;
		m_nbIndices[g] = 3*nbtris;
		firstIndex += 3*nbtris;
	}
	positionVBO->setDataSize(3);
	positionVBO->allocate(posBuff.size());
	Geom::Vec3f* ptrPos = reinterpret_cast<Geom::Vec3f*>(positionVBO->lockPtr());
	memcpy(ptrPos,&posBuff[0],posBuff.size()*sizeof(Geom::Vec3f));
	positionVBO->releasePtr();

	return true;
}



template <typename PFP>
bool OBJModel<PFP>::createGroupMatVBO_PT(Utils::VBO* positionVBO, Utils::VBO* texcoordVBO)
{
	m_beginIndices.clear();
	m_nbIndices.clear();

	std::vector<Geom::Vec3f> posBuff;
	std::vector<Geom::Vec2f> TCBuff;
	posBuff.reserve(16384);
	TCBuff.reserve(16384);

	std::vector< std::vector<Dart> > group_faces(m_materialNames.size());
	TraversorF<typename PFP::MAP> traf(m_map);
	for (Dart d=traf.begin(); d!= traf.end(); d = traf.next())
	{
		unsigned int g = m_attMat[d];
		group_faces[g].push_back(d);
	}

	unsigned int firstIndex = 0;

	unsigned int sz = group_faces.size();
	m_beginIndices.resize(sz);
	m_nbIndices.resize(sz);


	for (unsigned int g=0; g<sz; ++g)
	{
		unsigned int nbtris = 0;
		std::vector<Dart>& traf = group_faces[g];

		for (std::vector<Dart>::iterator id=traf.begin(); id!= traf.end(); ++id)
		{
			Dart d = *id;

			Dart e = m_map.phi1(d);
			Dart f = m_map.phi1(e);
			do
			{
				posBuff.push_back(m_positions[d]);
				if (m_specialVertices.isMarked(d))
					TCBuff.push_back(m_texCoordsF[d]);
				else
					TCBuff.push_back(m_texCoords[d]);

				posBuff.push_back(m_positions[e]);
				if (m_specialVertices.isMarked(e))
					TCBuff.push_back(m_texCoordsF[e]);
				else
					TCBuff.push_back(m_texCoords[e]);

				posBuff.push_back(m_positions[f]);
				if (m_specialVertices.isMarked(f))
					TCBuff.push_back(m_texCoordsF[f]);
				else
					TCBuff.push_back(m_texCoords[f]);
				e=f;
				f = m_map.phi1(e);
				nbtris++;
			}while (f!=d);
		}
		m_beginIndices[g] = firstIndex;
		m_nbIndices[g] = 3*nbtris;
		firstIndex += 3*nbtris;
	}

	positionVBO->setDataSize(3);
	positionVBO->allocate(posBuff.size());
	Geom::Vec3f* ptrPos = reinterpret_cast<Geom::Vec3f*>(positionVBO->lockPtr());
	memcpy(ptrPos,&posBuff[0],posBuff.size()*sizeof(Geom::Vec3f));
	positionVBO->releasePtr();

	texcoordVBO->setDataSize(2);
	texcoordVBO->allocate(TCBuff.size());
	Geom::Vec2f* ptrTC = reinterpret_cast<Geom::Vec2f*>(texcoordVBO->lockPtr());
	memcpy(ptrTC,&TCBuff[0],TCBuff.size()*sizeof(Geom::Vec2f));
	texcoordVBO->releasePtr();

	return true;
}






template <typename PFP>
bool OBJModel<PFP>::createGroupMatVBO_PN(Utils::VBO* positionVBO, Utils::VBO* normalVBO)
{
	m_beginIndices.clear();
	m_nbIndices.clear();

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	std::vector<Geom::Vec3f> posBuff;
	std::vector<Geom::Vec2f> normalBuff;
	posBuff.reserve(16384);
	normalBuff.reserve(16384);

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	std::vector< std::vector<Dart> > group_faces(m_materialNames.size());
	TraversorF<typename PFP::MAP> traf(m_map);
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	for (Dart d=traf.begin(); d!= traf.end(); d = traf.next())
	{
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		unsigned int g = m_attMat[d];
		group_faces[g].push_back(d);
	}

	unsigned int firstIndex = 0;

	unsigned int sz = group_faces.size();
	m_beginIndices.resize(sz);
	m_nbIndices.resize(sz);


	for (unsigned int g=0; g<sz; ++g)
	{
		unsigned int nbtris = 0;
		std::vector<Dart>& traf = group_faces[g];

		for (std::vector<Dart>::iterator id=traf.begin(); id!= traf.end(); ++id)
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		{
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			Dart d = *id;
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			Dart e = m_map.phi1(d);
			Dart f = m_map.phi1(e);
			do
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			{
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				posBuff.push_back(m_positions[d]);
				if (m_specialVertices.isMarked(d))
				{
					normalBuff.push_back(m_normalsF[d]);
				}
				else
				{
					normalBuff.push_back(m_normals[d]);
				}
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				posBuff.push_back(m_positions[e]);
				if (m_specialVertices.isMarked(e))
				{
					normalBuff.push_back(m_normalsF[e]);
				}
				else
				{
					normalBuff.push_back(m_normals[e]);
				}

				posBuff.push_back(m_positions[f]);
				if (m_specialVertices.isMarked(f))
				{
					normalBuff.push_back(m_normalsF[f]);
				}
				else
				{
					normalBuff.push_back(m_normals[f]);
				}
				e=f;
				f = m_map.phi1(e);
				nbtris++;
			}while (f!=d);
		}
		m_beginIndices[g] = firstIndex;
		m_nbIndices[g] = 3*nbtris;
		firstIndex += 3*nbtris;
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	}

	positionVBO->setDataSize(3);
	positionVBO->allocate(posBuff.size());
	Geom::Vec3f* ptrPos = reinterpret_cast<Geom::Vec3f*>(positionVBO->lockPtr());
	memcpy(ptrPos,&posBuff[0],posBuff.size()*sizeof(Geom::Vec3f));
	positionVBO->releasePtr();

	normalVBO->setDataSize(3);
	normalVBO->allocate(normalBuff.size());
	Geom::Vec3f* ptrNormal = reinterpret_cast<Geom::Vec3f*>(normalVBO->lockPtr());
	memcpy(ptrNormal, &normalBuff[0], normalBuff.size()*sizeof(Geom::Vec3f));
	normalVBO->releasePtr();

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	return true;
}

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template <typename PFP>
bool OBJModel<PFP>::createGroupMatVBO_PTN( Utils::VBO* positionVBO,
											Utils::VBO* texcoordVBO,
											Utils::VBO* normalVBO)
{
	m_beginIndices.clear();
	m_nbIndices.clear();

	if (!m_normals.isValid())
	{
		CGoGNerr << "no normal attribute "<< CGoGNendl;
		return false;
	}
	if (!m_texCoords.isValid())
	{
		CGoGNerr << "no tex coords attribute "<< CGoGNendl;
		return false;
	}

	std::vector<Geom::Vec3f> posBuff;
	std::vector<Geom::Vec2f> TCBuff;
	std::vector<Geom::Vec3f> normalBuff;
	posBuff.reserve(16384);
	TCBuff.reserve(16384);
	normalBuff.reserve(16384);


	std::vector< std::vector<Dart> > group_faces(m_materialNames.size());
	TraversorF<typename PFP::MAP> traf(m_map);
	for (Dart d=traf.begin(); d!= traf.end(); d = traf.next())
	{
		unsigned int g = m_attMat[d];
		group_faces[g].push_back(d);
	}

	unsigned int firstIndex = 0;

	unsigned int sz = group_faces.size();
	m_beginIndices.resize(sz);
	m_nbIndices.resize(sz);


	for (unsigned int g=0; g<sz; ++g)
	{
		unsigned int nbtris = 0;
		std::vector<Dart>& traf = group_faces[g];

		for (std::vector<Dart>::iterator id=traf.begin(); id!= traf.end(); ++id)
		{
			Dart d = *id;

			Dart e = m_map.phi1(d);
			Dart f = m_map.phi1(e);
			do
			{
				posBuff.push_back(m_positions[d]);
//				if (m_specialVertices.isMarked(d))
				{
					if (hasTexCoords())
						TCBuff.push_back(m_texCoordsF[d]);
					else
						TCBuff.push_back(m_texCoords[d]);
					if (hasNormals())
						normalBuff.push_back(m_normalsF[d]);
					else
						normalBuff.push_back(m_normals[d]);
				}
//				else
//				{
//					TCBuff.push_back(m_texCoords[d]);
//					normalBuff.push_back(m_normals[d]);
//				}

				posBuff.push_back(m_positions[e]);
//				if (m_specialVertices.isMarked(e))
				{
					if (hasTexCoords())
						TCBuff.push_back(m_texCoordsF[e]);
					else
						TCBuff.push_back(m_texCoords[e]);
					if (hasNormals())
						normalBuff.push_back(m_normalsF[e]);
					else
						normalBuff.push_back(m_normals[e]);
				}
//				else
//				{
//					TCBuff.push_back(m_texCoords[e]);
//					normalBuff.push_back(m_normals[e]);
//				}

				posBuff.push_back(m_positions[f]);
//				if (m_specialVertices.isMarked(f))
				{
					if (hasTexCoords())
						TCBuff.push_back(m_texCoordsF[f]);
					else
						TCBuff.push_back(m_texCoords[f]);
					if (hasNormals())
						normalBuff.push_back(m_normalsF[f]);
					else
						normalBuff.push_back(m_normals[f]);
				}
//				else
//				{
//					TCBuff.push_back(m_texCoords[f]);
//					normalBuff.push_back(m_normals[f]);
//				}

				e=f;
				f = m_map.phi1(e);
				nbtris++;
			}while (f!=d);
		}
		m_beginIndices[g] = firstIndex;
		m_nbIndices[g] = 3*nbtris;

		firstIndex += 3*nbtris;
	}

	positionVBO->setDataSize(3);
	positionVBO->allocate(posBuff.size());
	Geom::Vec3f* ptrPos = reinterpret_cast<Geom::Vec3f*>(positionVBO->lockPtr());
	memcpy(ptrPos,&posBuff[0],posBuff.size()*sizeof(Geom::Vec3f));
	positionVBO->releasePtr();

	texcoordVBO->setDataSize(2);
	texcoordVBO->allocate(TCBuff.size());
	Geom::Vec2f* ptrTC = reinterpret_cast<Geom::Vec2f*>(texcoordVBO->lockPtr());
	memcpy(ptrTC,&TCBuff[0],TCBuff.size()*sizeof(Geom::Vec2f));
	texcoordVBO->releasePtr();

	normalVBO->setDataSize(3);
	normalVBO->allocate(normalBuff.size());
	Geom::Vec3f* ptrNormal = reinterpret_cast<Geom::Vec3f*>(normalVBO->lockPtr());
	memcpy(ptrNormal, &normalBuff[0], normalBuff.size()*sizeof(Geom::Vec3f));
	normalVBO->releasePtr();

	return true;
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}


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template <typename PFP>
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bool OBJModel<PFP>::import( const std::string& filename, std::vector<std::string>& attrNames)
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{
	typedef  typename PFP::VEC3 VEC3;
	typedef Geom::Vec2f VEC2;

	attrNames.clear();
	// open file
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	std::ifstream fp(filename.c_str()/*, std::ios::binary*/);
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	if (!fp.good())
	{
		CGoGNerr << "Unable to open file " << filename << CGoGNendl;
		return false;
	}

	std::string ligne;
	std::string tag;
	do
	{
		std::getline (fp, ligne);
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		std::stringstream oss(ligne);
		oss >> tag;
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		if (tag == "v")
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			m_tagV++;
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		if (tag == "vn")
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			m_tagVN++;
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		if (tag == "vt")
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			m_tagVT++;
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		if (tag == "g")
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			m_tagG++;
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		if (tag == "f")
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			m_tagF++;
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		if (tag == "mtllib")
		{
			unsigned found = filename.find_last_of("/\\");
			std::string mtfn;
			oss >> mtfn;
			m_matPath = filename.substr(0,found) + "/";
			m_matFileName = m_matPath + mtfn;
		}
		tag.clear();

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	}while (!fp.eof());



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	m_positions =  m_map.template getAttribute<typename PFP::VEC3, VERTEX>("position") ;
	if (!m_positions.isValid())
		m_positions = m_map.template addAttribute<VEC3, VERTEX>("position") ;
	attrNames.push_back(m_positions.name()) ;
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	m_texCoords =  m_map.template getAttribute<VEC2, VERTEX>("texCoord") ;
	if (!m_texCoords.isValid())
		m_texCoords = m_map.template addAttribute<VEC2, VERTEX>("texCoord") ;
	attrNames.push_back(m_texCoords.name()) ;

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	if (m_tagVT != 0)
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	{
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		m_texCoordsF =  m_map.template getAttribute<VEC2, VERTEX1>("texCoordF") ;
		if (!m_texCoordsF.isValid())
			m_texCoordsF = m_map.template addAttribute<VEC2, VERTEX1>("texCoordF") ;
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	}

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	m_normals =  m_map.template getAttribute<typename PFP::VEC3, VERTEX>("normal") ;
	if (!m_normals.isValid())
		m_normals = m_map.template addAttribute<VEC3, VERTEX>("normal") ;
	attrNames.push_back(m_normals.name()) ;

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	if (m_tagVN != 0)
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	{
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		m_normalsF =  m_map.template getAttribute<VEC3, VERTEX1>("normalF") ;
		if (!m_normalsF.isValid())
			m_normalsF = m_map.template addAttribute<VEC3, VERTEX1>("normalF") ;
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	}

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	if (m_tagG != 0)
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	{
		m_groups =  m_map.template getAttribute<unsigned int, FACE>("groups") ;
		if (!m_groups.isValid())
			m_groups = m_map.template addAttribute<unsigned int, FACE>("groups") ;
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		attrNames.push_back(m_groups.name()) ;
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	}
	
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	m_attMat =  m_map.template getAttribute<unsigned int, FACE>("material") ;
	if (!m_attMat.isValid())
		m_attMat = m_map.template addAttribute<unsigned int, FACE>("material") ;
	attrNames.push_back(m_attMat.name()) ;
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	AttributeContainer& container = m_map.template getAttributeContainer<VERTEX>() ;

	fp.close();
	fp.clear();
	fp.open(filename.c_str());

	std::vector<VEC3> normalsBuffer;
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	normalsBuffer.reserve(m_tagVN);
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	std::vector<VEC2> texCoordsBuffer;
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	texCoordsBuffer.reserve(m_tagVT);
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	std::vector<unsigned int> verticesID;
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	verticesID.reserve(m_tagV);
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	std::vector<unsigned int> normalsID;
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	normalsID.reserve(m_tagV);
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	std::vector<unsigned int> texCoordsID;
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	texCoordsID.reserve(m_tagV);
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	std::vector<unsigned int> localIndices;
	localIndices.reserve(64*3);
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	FunctorInitEmb<typename PFP::MAP, VERTEX> fsetemb(m_map);
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	VertexAutoAttribute< NoTypeNameAttribute< std::vector<Dart> > > vecDartsPerVertex(m_map, "incidents");
	VertexAutoAttribute< NoTypeNameAttribute< std::vector<unsigned int> > > vecNormIndPerVertex(m_map, "incidentsN");
	VertexAutoAttribute< NoTypeNameAttribute< std::vector<unsigned int> > > vecTCIndPerVertex(m_map, "incidentsTC");
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	unsigned int currentGroup = 0;
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	unsigned int currentMat = 0;
	unsigned int nextMat = 0;

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	DartMarkerNoUnmark mk(m_map) ;
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	unsigned int i = 0;
	fp >> tag;
	std::getline(fp, ligne);
	do
	{
		if (tag == std::string("v"))
		{
			std::stringstream oss(ligne);

			float x,y,z;
			oss >> x;
			oss >> y;
			oss >> z;

			VEC3 pos(x,y,z);

			unsigned int id = container.insertLine();
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			m_positions[id] = pos;
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			verticesID.push_back(id);
			i++;
		}

		if (tag == std::string("vn"))
		{
			std::stringstream oss(ligne);

			VEC3 norm;
			oss >> norm[0];
			oss >> norm[1];
			oss >> norm[2];
			normalsBuffer.push_back(norm);
		}

		if (tag == std::string("vt"))
		{
			std::stringstream oss(ligne);
			VEC2 tc;
			oss >> tc[0];
			oss >> tc[1];
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			texCoordsBuffer.push_back(tc);
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		}

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		if (tag == std::string("usemtl"))
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		{
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			std::stringstream oss(ligne);
			std::string matName;
			oss >> matName;
			std::map<std::string, int>::iterator it = m_materialNames.find(matName);

			if (it==m_materialNames.end())
			{
				m_materialNames.insert(std::pair<std::string,int>(matName,nextMat));
				currentMat = nextMat++;
				std::cout << "New Material Name = "<< matName << "  index = "<< currentMat << std::endl;

			}
			else
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			{
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				currentMat = it->second;
				std::cout << "Using Material Name = "<<  matName << "  index = "<< currentMat << std::endl;
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			}
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		}

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//		if (tag == std::string("g"))
//		{
//			m_groupNames.push_back(ligne);
//			std::string buf;
//			fp >> buf;
//			if (buf != "usemtl")
//			{
//				CGoGNerr << "problem reading OBJ, waiting for usemtl get "<< buf << CGoGNendl;
//			}
//			fp >> buf;
//			m_materialNames.insert(std::pair<std::string,int>(buf,-1));
//			m_groupMaterialNames.push_back(buf);
//			currentGroup++;
//		}

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		if (tag == std::string("f"))
		{
			std::stringstream oss(ligne);

			short nbe = readObjLine(oss,localIndices);

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			Dart d = m_map.newFace(nbe, false);
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			if (m_tagG!=0)
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				m_groups[d] = currentGroup;
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			m_attMat[d] = currentMat;
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			for (short j = 0; j < nbe; ++j)
			{
				unsigned int em = localIndices[3*j]-1;		// get embedding
				fsetemb.changeEmb(em) ;
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				m_map.template foreach_dart_of_orbit<PFP::MAP::VERTEX_OF_PARENT>(d, fsetemb);
				mk.mark(d) ;								// mark on the fly to unmark on second loop
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				vecDartsPerVertex[em].push_back(d);		// store incident darts for fast adjacency reconstruction
				vecTCIndPerVertex[em].push_back(localIndices[3*j+1]-1);
				vecNormIndPerVertex[em].push_back(localIndices[3*j+2]-1);
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				d = m_map.phi1(d);
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			}
		}
		fp >> tag;
		std::getline(fp, ligne);
	} while (!fp.eof());
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	fp.close ();
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	// reconstruct neighbourhood
	unsigned int nbBoundaryEdges = 0;
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	for (Dart d = m_map.begin(); d != m_map.end(); m_map.next(d))
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	{
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		if (mk.isMarked(d))
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		{
			// darts incident to end vertex of edge
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			std::vector<Dart>& vec = vecDartsPerVertex[m_map.phi1(d)];
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			unsigned int embd = m_map.template getEmbedding<VERTEX>(d);
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			Dart good_dart = NIL;
			for (typename std::vector<Dart>::iterator it = vec.begin(); it != vec.end() && good_dart == NIL; ++it)
			{
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				if (m_map.template getEmbedding<VERTEX>(m_map.phi1(*it)) == embd)
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					good_dart = *it;
			}

			if (good_dart != NIL)
			{
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				if (good_dart == m_map.phi2(good_dart) && (d == m_map.phi2(d)))
					m_map.sewFaces(d, good_dart, false);
				else
					m_dirtyEdges.mark(d);
				mk.unmarkOrbit<EDGE>(d);
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			}
			else
			{
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				mk.unmark(d);
				m_dirtyEdges.mark(d);
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				++nbBoundaryEdges;
			}
		}
	}

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	// A SIMPLIFIER ???

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	TraversorV<typename PFP::MAP> tra(m_map);
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	for (Dart d = tra.begin(); d != tra.end(); d = tra.next())
	{
		std::vector<Dart>& vec			= vecDartsPerVertex[d];
		std::vector<unsigned int>& vtc	= vecTCIndPerVertex[d];
		std::vector<unsigned int>& vn	= vecNormIndPerVertex[d];

		// test if normal vertex or multi-attrib vertex
		unsigned int nb = vtc.size();
		bool same=true;
		for (unsigned int j=1; (j<nb)&&(same); ++j)
		{
			if ( (vtc[j] != vtc[0]) || (vn[j] != vn[0]) )
				same = false;
		}

		// if not all faces the same embedding
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//		if (!same)
//		{
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			for (unsigned int j=0; j<nb; ++j)
			{
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				Dart e = vec[j];
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				if (m_tagVT)
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				{
					if (vecTCIndPerVertex[e][j] != 0xffffffff)
						m_texCoordsF[e] = texCoordsBuffer[ vecTCIndPerVertex[e][j] ];
					else
						m_texCoordsF[e] = Geom::Vec2f(0);
				}
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				if (m_tagVN)
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				{
					if (vecNormIndPerVertex[e][j] != 0xffffffff)
						m_normalsF[e] = normalsBuffer[ vecNormIndPerVertex[e][j] ];
					else
						m_normalsF[e] = VEC3(0);
				}
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			}
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			m_specialVertices.mark(d);
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//		}
//		else
//		{
//			if (tagVT)
//				m_texCoords[d] = texCoordsBuffer[ vecTCIndPerVertex[d][0] ];
//			if (tagVN)
//				m_normals[d] = normalsBuffer[ vecNormIndPerVertex[d][0] ];
//			m_specialVertices.unmark(d);
//		}
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	}

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	readMaterials();

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	return true;
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}



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}
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}
} // end namespaces
}