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/****************************************************************************
* 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 __VCGLIB_DUAL_MESH
#define __VCGLIB_DUAL_MESH
#include <vcg/complex/complex.h>
#include <vcg/complex/algorithms/update/topology.h>
#include <vcg/simplex/face/pos.h>
#include <vcg/complex/algorithms/clean.h>
#include <vcg/complex/algorithms/polygonal_algorithms.h>
namespace vcg {
namespace tri {
template <class PolyMeshType>
class DualMeshing
{
typedef typename PolyMeshType::VertexType VertexType;
typedef typename PolyMeshType::FaceType FaceType;
typedef typename PolyMeshType::CoordType CoordType;
typedef typename PolyMeshType::ScalarType ScalarType;
static void ComposeFace(VertexType &startV,
FaceType &startF,
std::map<std::pair<int,int>, int> &EdgeMap,
const std::vector<int> &FaceMap,
const PolyMeshType &primal,
std::vector<int> &vertSeq)
{
(void)EdgeMap;
vcg::face::Pos<FaceType> startP(&startF,&startV);
//get the star of pos
std::vector<vcg::face::Pos<FaceType> > posVec;
vcg::face::VFOrderedStarFF(startP,posVec);
for (size_t i=0;i<posVec.size();i++)
{
FaceType *f=posVec[i].F();
int indexF=vcg::tri::Index(primal,f);
int indexV=FaceMap[indexF];
vertSeq.push_back(indexV);
}
}
static void CreateFaceVert(PolyMeshType &primal,
PolyMeshType &dual,
std::vector<int> &VertMap,
std::vector<int> &VertFace,
bool snapBorder)
{
VertMap.clear();
VertMap.resize(primal.face.size(),-1);
VertFace.clear();
VertFace.resize(primal.vert.size(),-1);
for (size_t i=0;i<primal.face.size();i++)
{
CoordType pos(0,0,0);
int num=0;
if (snapBorder)//search for border edge
{
for (int j=0;j<primal.face[i].VN();j++)
{
if (!primal.face[i].V(j)->IsB())continue;
pos+=primal.face[i].P(j);
num++;
}
if (num>0)
pos/=num;
}
if (num==0)
{
for (int j=0;j<primal.face[i].VN();j++)
{
pos+=primal.face[i].V(j)->P();
}
pos/=(ScalarType)primal.face[i].VN();
}
vcg::tri::Allocator<PolyMeshType>::AddVertex(dual,pos);
VertMap[i]=dual.vert.size()-1;
dual.vert.back().Q()=i;
}
//then initialize VF first face
for (size_t i=0;i<primal.face.size();i++)
for (int j=0;j<primal.face[i].VN();j++)
{
int indexV=vcg::tri::Index(primal,primal.face[i].V(j));
if (VertFace[indexV]!=-1)continue;
VertFace[indexV]=i;
}
}
public:
static void MakeDual(PolyMeshType &primal,
PolyMeshType &dual,
bool snapBorder=true)
{
dual.Clear();
vcg::tri::RequirePolygonalMesh(primal);
vcg::tri::RequirePolygonalMesh(dual);
vcg::tri::RequireFFAdjacency(primal);
vcg::tri::RequirePerFaceQuality(dual);
vcg::tri::UpdateTopology<PolyMeshType>::FaceFace(primal);
vcg::tri::UpdateFlags<PolyMeshType>::VertexBorderFromFaceAdj(primal);
std::map<std::pair<int,int>, int> VertEdgeMap;
std::cout<<"Creating Dual Vertices"<<std::endl;
std::vector<int> VertFaceMap,VertFace;
CreateFaceVert(primal,dual,VertFaceMap,VertFace,snapBorder);
std::cout<<"Creating Dual Faces"<<std::endl;
for (size_t i=0;i<primal.vert.size();i++)
{
if (primal.vert[i].IsB())continue;
FaceType *firstF=&primal.face[VertFace[i]];
std::vector<int> VertSeq;
ComposeFace(primal.vert[i],*firstF,VertEdgeMap,VertFaceMap,primal,VertSeq);
vcg::tri::Allocator<PolyMeshType>::AddFaces(dual,1);
dual.face.back().Alloc(VertSeq.size());
for (size_t j=0;j<VertSeq.size();j++)
dual.face.back().V(j)=&dual.vert[VertSeq[j]];
dual.face.back().Q()=i;
}
vcg::tri::Clean<PolyMeshType>::RemoveUnreferencedVertex(dual);
//finally remove valence 1 vertices on the border
vcg::PolygonalAlgorithm<PolyMeshType>::RemoveValence2Vertices(dual);
}
};
}
}
#endif // __VCGLIB_DUAL_MESH
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