io_material.h

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* VCGLib                                                            o o     *
* Visual and Computer Graphics Library                            o     o   *
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* Copyright(C) 2004                                                \/)\/    *
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/****************************************************************************
  History

 $Log: not supported by cvs2svn $
 Revision 1.5  2008/02/27 00:34:43  cignoni
 corrected various bugs in the export of texture coords

 Revision 1.4  2007/06/20 10:28:04  tarini
 "newline at end of file" and  "endif" warnings fixed

 Revision 1.3  2006/11/09 07:51:44  cignoni
 bug due to wrong access to eventually unexistent FaceColor

 Revision 1.2  2006/10/09 19:58:08  cignoni
 Added casts to remove warnings

 Revision 1.1  2006/03/07 13:19:29  cignoni
 First Release with OBJ import support

 Revision 1.1  2006/02/16 19:28:36  fmazzant
 transfer of Export_3ds.h, Export_obj.h, Io_3ds_obj_material.h from Meshlab to vcg

 Revision 1.1  2006/02/06 11:04:40  fmazzant
 added file material.h. it include struct Material, CreateNewMaterial(...) and MaterialsCompare(...)


 ****************************************************************************/

#ifndef __VCGLIB_MATERIAL
#define __VCGLIB_MATERIAL

#include <string>
#include <vector>
#include <vcg/space/point3.h>

namespace vcg {
namespace tri {
namespace io {
        
        /*
                structures material
        */
        struct Material
        {
                unsigned int index;//index of material
                std::string materialName;

                Point3f Ka;//ambient
                Point3f Kd;//diffuse
                Point3f Ks;//specular
                
                float d;//alpha
                float Tr;//alpha
                
                int illum;//specular illumination
                float Ns;

                std::string map_Kd; //filename texture
        };

        
        template <class SaveMeshType>
        class Materials
        {
        public: 
                typedef typename SaveMeshType::FaceIterator FaceIterator;
                typedef typename SaveMeshType::VertexIterator VertexIterator;
                typedef typename SaveMeshType::VertexType VertexType;
        
                /*
                        creates a new meterial
                */
                inline static int CreateNewMaterial(SaveMeshType &m, std::vector<Material> &materials, unsigned int index, FaceIterator &fi)
                {                       
                        Point3f diffuse(1,1,1);
      float Transp = 1;
      if(HasPerFaceColor(m)){
        diffuse = Point3f((float)((*fi).C()[0])/255.0f,(float)((*fi).C()[1])/255.0f,(float)((*fi).C()[2])/255.0f);//diffuse
                          Transp = (float)((*fi).C()[3])/255.0f;//alpha
      }
                        
                        int illum = 2; //default not use Ks!
                        float ns = 0.0; //default

                        Material mtl;

                        mtl.index = index;//index of materials
                        mtl.Ka = Point3f(0.2f,0.2f,0.2f);//ambient
                        mtl.Kd = diffuse;//diffuse
                        mtl.Ks = Point3f(1.0f,1.0f,1.0f);//specular
                        mtl.Tr = Transp;//alpha
                        mtl.Ns = ns;
                        mtl.illum = illum;//illumination
                        
                        if(m.textures.size() && (*fi).WT(0).n() >=0 ) 
                                mtl.map_Kd = m.textures[(*fi).WT(0).n()];
                        else
                                mtl.map_Kd = "";
                        
                        int i = -1;
                        if((i = MaterialsCompare(materials,mtl)) == -1)
                        {
                                materials.push_back(mtl);
                                return materials.size();
                        }
                        return i;
                }

                /*
                        returns the index of the material if it exists inside the list of the materials, 
                        otherwise it returns -1.
                */
                inline static int MaterialsCompare(std::vector<Material> &materials, Material mtl)
                {
                        for(unsigned int i=0;i<materials.size();i++)
                        {
                                if(materials[i].Kd     != mtl.Kd    ) continue;
                                if(materials[i].Ka     != mtl.Ka    ) continue;
                                if(materials[i].Ks     != mtl.Ks    ) continue;
                                if(materials[i].Tr     != mtl.Tr    ) continue;
                                if(materials[i].illum  != mtl.illum ) continue;
                                if(materials[i].Ns     != mtl.Ns    ) continue;
                                if(materials[i].map_Kd != mtl.map_Kd) continue;
                                return i;
                        }
                        return -1;
                }
        };
}
}
}
#endif //__VCGLIB_MATERIAL