235 lines
8.4 KiB
C++
235 lines
8.4 KiB
C++
/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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#ifndef __VCG_DECIMATION_TRICOLLAPSE
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#define __VCG_DECIMATION_TRICOLLAPSE
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#include<vcg/complex/algorithms/edge_collapse.h>
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#include<vcg/simplex/face/pos.h>
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#include<vcg/complex/algorithms/local_optimization.h>
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#include<vcg/complex/algorithms/update/topology.h>
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namespace vcg{
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namespace tri{
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/** \addtogroup trimesh */
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/*@{*/
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/// This Class is specialization of LocalModification for the edge collapse.
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/// It wraps the atomic operation EdgeCollapse to be used in a optimizatin routine.
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/// Note that it has knowledge of the heap of the class LocalOptimization because
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/// it is responsible of updating it after a collapse has been performed;
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/// This is the base class of all the specialized collapse classes like for example Quadric Edge Collapse.
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/// Each derived class
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template<class TriMeshType, class VertexPair, class MYTYPE>
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class TriEdgeCollapse: public LocalOptimization<TriMeshType>::LocModType
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{
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public:
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/// static data to gather statistical information about the reasons of collapse failures
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class FailStat {
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public:
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static int &Volume() {static int vol=0; return vol;}
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static int &LinkConditionFace(){static int lkf=0; return lkf;}
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static int &LinkConditionEdge(){static int lke=0; return lke;}
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static int &LinkConditionVert(){static int lkv=0; return lkv;}
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static int &OutOfDate() {static int ofd=0; return ofd;}
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static int &Border() {static int bor=0; return bor;}
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static void Init()
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{
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Volume() =0;
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LinkConditionFace()=0;
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LinkConditionEdge()=0;
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LinkConditionVert()=0;
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OutOfDate() =0;
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Border() =0;
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}
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};
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protected:
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typedef typename TriMeshType::FaceType FaceType;
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typedef typename TriMeshType::FaceType::VertexType VertexType;
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// typedef typename VertexType::EdgeType EdgeType;
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typedef typename FaceType::VertexType::CoordType CoordType;
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typedef typename TriMeshType::VertexType::ScalarType ScalarType;
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typedef typename LocalOptimization<TriMeshType>::HeapElem HeapElem;
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typedef typename LocalOptimization<TriMeshType>::HeapType HeapType;
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TriMeshType *mt;
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///the pair to collapse
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VertexPair pos;
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///mark for up_dating
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static int& GlobalMark(){ static int im=0; return im;}
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///mark for up_dating
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int localMark;
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/// priority in the heap
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ScalarType _priority;
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public:
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/// Default Constructor
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inline TriEdgeCollapse()
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{}
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///Constructor with postype
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inline TriEdgeCollapse(const VertexPair &p, int mark, BaseParameterClass *pp)
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{
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localMark = mark;
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pos=p;
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_priority = ComputePriority(pp);
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}
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~TriEdgeCollapse()
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{}
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private:
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public:
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inline ScalarType ComputePriority(BaseParameterClass *)
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{
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_priority = Distance(pos.V(0)->cP(),pos.V(1)->cP());
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return _priority;
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}
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virtual const char *Info(TriMeshType &m) {
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mt = &m;
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static char buf[60];
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sprintf(buf,"%i -> %i %g\n", int(pos.V(0)-&m.vert[0]), int(pos.V(1)-&m.vert[0]),-_priority);
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return buf;
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}
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inline void Execute(TriMeshType &m, BaseParameterClass *)
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{
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CoordType MidPoint=(pos.V(0)->P()+pos.V(1)->P())/2.0;
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EdgeCollapser<TriMeshType,VertexPair>::Do(m, pos, MidPoint);
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}
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static bool IsSymmetric(BaseParameterClass *) { return true;}
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// This function is called after an action to re-add in the heap elements whose priority could have been changed.
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// in the plain case we just put again in the heap all the edges around the vertex resulting from the previous collapse: v[1].
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// if the collapse is not symmetric you should add also backward edges (because v0->v1 collapse could be different from v1->v0)
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inline void UpdateHeap(HeapType & h_ret, BaseParameterClass *pp)
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{
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GlobalMark()++;
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VertexType *v[2];
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v[0]= pos.V(0);v[1]=pos.V(1);
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v[1]->IMark() = GlobalMark();
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// First loop around the remaining vertex to unmark visited flags
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vcg::face::VFIterator<FaceType> vfi(v[1]);
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while (!vfi.End()){
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vfi.V1()->ClearV();
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vfi.V2()->ClearV();
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++vfi;
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}
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// Second Loop: add all the outgoing edges around v[1]
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// for each face add the two edges outgoing from v[1] and not visited.
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vfi = face::VFIterator<FaceType>(v[1]);
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while (!vfi.End())
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{
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assert(!vfi.F()->IsD());
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if( !(vfi.V1()->IsV()) && (vfi.V1()->IsRW()))
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{
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vfi.V1()->SetV();
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h_ret.push_back(HeapElem(new MYTYPE(VertexPair( vfi.V(),vfi.V1() ),GlobalMark(),pp)));
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std::push_heap(h_ret.begin(),h_ret.end());
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if(! this->IsSymmetric(pp)){
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h_ret.push_back(HeapElem(new MYTYPE(VertexPair( vfi.V1(),vfi.V()),GlobalMark(),pp)));
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std::push_heap(h_ret.begin(),h_ret.end());
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}
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}
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if( !(vfi.V2()->IsV()) && (vfi.V2()->IsRW()))
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{
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vfi.V2()->SetV();
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h_ret.push_back(HeapElem(new MYTYPE(VertexPair(vfi.F()->V(vfi.I()),vfi.F()->V2(vfi.I())),GlobalMark(),pp)));
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std::push_heap(h_ret.begin(),h_ret.end());
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if(! this->IsSymmetric(pp)){
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h_ret.push_back(HeapElem(new MYTYPE(VertexPair (vfi.F()->V1(vfi.I()),vfi.F()->V(vfi.I())),GlobalMark(),pp)));
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std::push_heap(h_ret.begin(),h_ret.end());
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}
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}
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// if(vfi.V1()->IsRW() && vfi.V2()->IsRW() )
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// {
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// h_ret.push_back(HeapElem(new MYTYPE(EdgeType(vfi.V1(),vfi.V2()),this->GlobalMark())));
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// std::push_heap(h_ret.begin(),h_ret.end());
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// if(IsSymmetric()){
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// h_ret.push_back(HeapElem(new MYTYPE(EdgeType(vfi.V2(),vfi.V1()), this->GlobalMark())));
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// std::push_heap(h_ret.begin(),h_ret.end());
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// }
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// }
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++vfi;
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} // end while
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}
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ModifierType IsOfType(){ return TriEdgeCollapseOp;}
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inline bool IsFeasible(BaseParameterClass *){
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return EdgeCollapser<TriMeshType,VertexPair>::LinkConditions(pos);
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}
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inline bool IsUpToDate() const
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{
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VertexType *v0=pos.cV(0);
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VertexType *v1=pos.cV(1);
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if( v0->IsD() || v1->IsD() ||
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localMark < v0->IMark() ||
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localMark < v1->IMark() )
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{
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++FailStat::OutOfDate();
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return false;
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}
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return true;
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}
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virtual ScalarType Priority() const {
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return _priority;
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}
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static void Init(TriMeshType &m, HeapType &h_ret, BaseParameterClass *pp)
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{
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vcg::tri::UpdateTopology<TriMeshType>::VertexFace(m);
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h_ret.clear();
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typename TriMeshType::FaceIterator fi;
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for(fi = m.face.begin(); fi != m.face.end();++fi)
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if(!(*fi).IsD()){
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for (int j=0;j<3;j++)
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{
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VertexPair p((*fi).V0(j), (*fi).V1(j));
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p.Sort();
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h_ret.push_back(HeapElem(new MYTYPE(p, IMark(m),pp)));
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//printf("Inserting in heap coll %3i ->%3i %f\n",p.V()-&m.vert[0],p.VFlip()-&m.vert[0],h_ret.back().locModPtr->Priority());
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}
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}
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}
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};
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}//end namespace tri
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}//end namespace vcg
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#endif
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