texture.h

/****************************************************************************
* VCGLib                                                            o o     *
* Visual and Computer Graphics Library                            o     o   *
*                                                                _   O  _   *
* Copyright(C) 2004-2016                                           \/)\/    *
* Visual Computing Lab                                            /\/|      *
* ISTI - Italian National Research Council                           |      *
*                                                                    \      *
* All rights reserved.                                                      *
*                                                                           *
* This program is free software; you can redistribute it and/or modify      *   
* it under the terms of the GNU General Public License as published by      *
* the Free Software Foundation; either version 2 of the License, or         *
* (at your option) any later version.                                       *
*                                                                           *
* This program 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 General Public License (http://www.gnu.org/licenses/gpl.txt)          *
* for more details.                                                         *
*                                                                           *
****************************************************************************/
 
 
#ifndef __VCG_TRI_UPDATE_TEXTURE
#define __VCG_TRI_UPDATE_TEXTURE
 
//#include <vcg/space/plane.h>
 
namespace vcg {
namespace tri {
 
 
 
template <class ComputeMeshType>
class UpdateTexture
{
 
public:
typedef ComputeMeshType MeshType; 
typedef typename MeshType::ScalarType     ScalarType;
typedef typename MeshType::VertexType     VertexType;
typedef typename MeshType::VertexPointer  VertexPointer;
typedef typename MeshType::VertexIterator VertexIterator;
typedef typename MeshType::FaceType       FaceType;
typedef typename MeshType::FacePointer    FacePointer;
typedef typename MeshType::FaceIterator   FaceIterator;
typedef typename vcg::Point2<ScalarType> UVCoordType;
 
static void WedgeTexFromPlane(ComputeMeshType &m, const Point3<ScalarType> &uVec, const Point3<ScalarType> &vVec, bool aspectRatio, ScalarType sideGutter=0.0)
{
    Box2f bb;
 
    FaceIterator fi;
    for(fi=m.face.begin();fi!=m.face.end();++fi)
        if(!(*fi).IsD()) 
        {
            for(int i=0;i<3;++i)
            {
                (*fi).WT(i).U()= (*fi).V(i)->cP() * uVec;
                (*fi).WT(i).V()= (*fi).V(i)->cP() * vVec;
                bb.Add((*fi).WT(i).P());
            }
        }   
 
    ScalarType wideU =  bb.max[0]- bb.min[0];
    ScalarType wideV =  bb.max[1]- bb.min[1];
 
    if (sideGutter>0.0)
    {
        ScalarType deltaGutter = std::min(wideU, wideV) * std::min(sideGutter, (ScalarType)0.5);
 
        bb.max[0] += deltaGutter;
        bb.min[0] -= deltaGutter;
        bb.max[1] += deltaGutter;
        bb.min[1] -= deltaGutter;
 
        wideU = bb.max[0] - bb.min[0];
        wideV = bb.max[1] - bb.min[1];
    }
 
    if (aspectRatio) {
        wideU = std::max(wideU, wideV);
        wideV = wideU;
    }
 
    for (fi = m.face.begin(); fi != m.face.end(); ++fi)
    if (!(*fi).IsD())
    {
        for (int i = 0; i<3; ++i)
        {
            (*fi).WT(i).U() = ((*fi).WT(i).U() - bb.min[0]) / wideU;
            (*fi).WT(i).V() = ((*fi).WT(i).V() - bb.min[1]) / wideV;
        }
    }
}
 
static void WedgeTexFromVertexTex(ComputeMeshType &m)
{
  for(FaceIterator fi=m.face.begin();fi!=m.face.end();++fi)
          if(!(*fi).IsD())
              {
               for(int i=0;i<fi->VN();++i)
               {
                 (*fi).WT(i).U() = (*fi).V(i)->T().U();
                 (*fi).WT(i).V() = (*fi).V(i)->T().V();
                 (*fi).WT(i).N() = 0;
               }
              }
}
 
 
static void WedgeTexRemoveNull(ComputeMeshType &m, const std::string &texturename)
{
    bool found=false;
    
    FaceIterator fi;
    // first loop lets check that there are -1 indexed textured face
    for(fi=m.face.begin();fi!=m.face.end();++fi)
        if(!(*fi).IsD()) if((*fi).WT(0).N()==-1) found = true;
    
    if(!found) return;
    m.textures.push_back(texturename);
    
    int nullId=m.textures.size()-1;
    
    for(fi=m.face.begin();fi!=m.face.end();++fi)
        if(!(*fi).IsD()) if((*fi).WT(0).N()==-1)        
        {
            (*fi).WT(0).N() = nullId;
            (*fi).WT(1).N() = nullId;
            (*fi).WT(2).N() = nullId;           
        }                                           
            
}
static int WedgeTexMergeClose(ComputeMeshType &m, ScalarType mergeThr = ScalarType(1.0/65536.0) )
{
  tri::RequireVFAdjacency(m);
  int mergedCnt=0;
  ForEachVertex(m, [&](VertexType &v){
    face::VFIterator<FaceType> vfi(&v);
    std::vector<UVCoordType> clusterVec;
    clusterVec.push_back(vfi.F()->WT(vfi.I()).P());
    ++vfi;
    while(!vfi.End())
    {
      UVCoordType cur= vfi.F()->WT(vfi.I()).P();
      bool merged=false;
      for(auto p:clusterVec) {
        if(p!=cur && Distance(p,cur) < mergeThr){ 
          vfi.F()->WT(vfi.I()).P()=p;
          ++mergedCnt;
          merged=true;
        }
      }
      if(!merged) 
        clusterVec.push_back(cur);
      
      ++vfi;      
    }
  });
  return mergedCnt;
}
 
}; // end class
 
}   // End namespace
}   // End namespace
 
 
#endif