288 lines
9.4 KiB
C
288 lines
9.4 KiB
C
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/*#***************************************************************************
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* Geodesic.h o o *
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* o o *
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* Visual Computing Group _ O _ *
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* IEI Institute, CNUCE Institute, CNR Pisa \/)\/ *
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* /\/| *
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* Copyright(C) 1999 by Paolo Cignoni, | *
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* All rights reserved. \ *
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* *
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* Permission to use, copy, modify, distribute and sell this software and *
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* its documentation for any purpose is hereby granted without fee, provided *
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* that the above copyright notice appear in all copies and that both that *
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* copyright notice and this permission notice appear in supporting *
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* documentation. the author makes no representations about the suitability *
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* of this software for any purpose. It is provided "as is" without express *
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* or implied warranty. *
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* *
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***************************************************************************#*/
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/*#**************************************************************************
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History
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$Log: not supported by cvs2svn $
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*#**************************************************************************/
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#include <assert.h>
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#include <vcg/container/simple_temporary_data.h>
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#include <vcg/simplex/face/pos.h>
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#include <vcg/math/base.h>
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#include <deque>
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#include <vector>
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#include <list>
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#include <functional>
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namespace vcg{
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template <class MeshType>
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class Geo{
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public:
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typedef typename MeshType::VertexPointer VertexPointer;
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template <class MeshType>
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struct TempData{
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TempData(){}
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TempData(const double & d_){d=d_;visited=false;}
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double d;
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bool visited;
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};
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typedef SimpleTempData<std::vector<typename MeshType::VertexType>, TempData<MeshType> > TempDataType;
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static TempDataType & TD(){ static TempDataType td; return td;}
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struct pred: public std::binary_function<VertexPointer,VertexPointer,bool>{
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bool operator()(const VertexPointer& v0, const VertexPointer& v1) const
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{return (Geo<MeshType>::TD()[v0].d > Geo<MeshType>::TD()[v1].d);}
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};
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static typename MeshType::VertexPointer BuildSP(
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MeshType & m,
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std::vector<typename MeshType::VertexPointer> & _frontier,
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double & max_distance,
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bool fartestOnBorder = false
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)
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{
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TD().c = &m.vert;
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bool isLeaf;
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std::vector<typename MeshType::VertexPointer> frontier;
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std::vector<typename MeshType::VertexPointer> :: iterator tmp;
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frontier.clear();
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//Requirements
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assert(m.HasVFTopology());
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if(m.vn==0) return NULL;
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MeshType::VertexIterator ii;
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std::list<typename MeshType::VertexPointer> children;
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typename MeshType::VertexPointer curr,fartest,pw1;
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bool toQueue;
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TD().Start(TempData<MeshType>(-1.0));
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std::list<typename MeshType::VertexPointer>::iterator is;
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std::deque<typename MeshType::VertexPointer> leaves;
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std::vector <std::pair<typename MeshType::VertexPointer,typename MeshType::ScalarType> > expansion;
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std::vector <typename MeshType::VertexPointer >::const_iterator ifr;
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face::VFIterator<typename MeshType::FaceType> x;int k;
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typename MeshType::VertexPointer pw;
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for(ifr = _frontier.begin(); ifr != _frontier.end(); ++ifr){
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TD()[*ifr].visited= true;
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TD()[*ifr].d = 0.0;
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}
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for(ifr = _frontier.begin(); ifr != _frontier.end(); ++ifr)
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{
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// determina la distanza dei vertici della fan
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for( x.f = (*ifr)->VFp(), x.z = (*ifr)->VFi(); x.f!=0; ++x )
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for(k=0;k<2;++k)
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{
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if(k==0) pw = x.f->V1(x.z);
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else pw = x.f->V2(x.z);
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if(TD()[pw].d ==-1){
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TD()[pw].d = Distance(pw->cP(),(*ifr)->cP());
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frontier.push_back(pw);
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}
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}
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}
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// initialize Heap
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make_heap(frontier.begin(),frontier.end(),pred());
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double curr_d,d_curr = 0.0;
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max_distance=0.0;
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std::vector<typename MeshType::VertexPointer >:: iterator iv;
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while(!frontier.empty())
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{ //printf("size: %d\n", frontier.size());
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expansion.clear();
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pop_heap(frontier.begin(),frontier.end(),pred());
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curr = frontier.back();
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frontier.pop_back();
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d_curr = TD()[curr].d;
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TD()[curr].visited = true;
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isLeaf = (!fartestOnBorder || curr->IsB());
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face::VFIterator<typename MeshType::FaceType> x;int k;
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for( x.f = curr->VFp(), x.z = curr->VFi(); x.f!=0; ++x )
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for(k=0;k<2;++k)
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{
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if(k==0) {
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pw = x.f->V1(x.z);
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pw1=x.f->V2(x.z);
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}
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else {
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pw = x.f->V2(x.z);
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pw1=x.f->V1(x.z);
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}
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const double & d_pw1 = TD()[pw1].d;
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if((!TD()[pw1].visited ) || d_curr == 0.0)
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{
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if(TD()[pw].d == -1){
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curr_d = TD()[curr].d + (pw->P()-curr->P()).Norm();
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expansion.push_back(std::pair<typename MeshType::VertexPointer,typename MeshType::ScalarType>(pw,curr_d));
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}
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continue;
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}
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assert( TD()[pw1].d != -1);
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assert( (curr!=pw) && (pw!=pw1) && (pw1 != curr));
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assert(d_pw1!=-1.0);
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//************** calcolo della distanza di pw in base alle distanze note di pw1 e curr
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//************** sapendo che (curr,pw,pw1) e'una faccia della mesh
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//************** (vedi figura in file distance.gif)
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Point3<MeshType::ScalarType> w_c = pw->cP()- curr->cP();
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Point3<MeshType::ScalarType> w_w1 = pw->cP()- pw1->cP();
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Point3<MeshType::ScalarType> w1_c = pw1->cP()- curr->cP();
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double ew_c = (w_c).Norm();
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double ew_w1 = (w_w1).Norm();
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double ec_w1 = (w1_c).Norm();
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double alpha,alpha_, beta,beta_,theta_c,theta,h,delta,s,a,b;
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alpha = acos((w_c*w1_c)/(ew_c*ec_w1));
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s = (d_curr + d_pw1+ec_w1)/2;
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a = s/ec_w1;
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b = a*s;
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alpha_ = 2*acos ( math::Min(1.0,sqrt( (b- a* d_pw1)/d_curr)));
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if ( alpha+alpha_ > M_PI){
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curr_d = d_curr + ew_c;
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}else
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{
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beta_ = 2*acos ( math::Min(1.0,sqrt( (b- a* d_curr)/d_pw1)));
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beta = acos((w_w1)*(-w1_c)/(ew_w1*ec_w1));
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if ( beta+beta_ > M_PI)
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curr_d = d_pw1 + ew_w1;
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else
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{
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theta = M_PI-alpha-alpha_;
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delta = cos(theta)* ew_c;
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h = sin(theta)* ew_c;
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curr_d = sqrt( pow(h,2)+ pow(d_curr + delta,2));
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}
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}
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//**************************************************************************************
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toQueue = (TD()[(pw)].d==-1);
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if(toQueue){// se non e'gia' in coda ce lo mette
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expansion.push_back(std::pair<typename MeshType::VertexPointer,typename MeshType::ScalarType>(pw,curr_d));
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}else
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{
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if( TD()[(pw)].d > curr_d )
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TD()[(pw)].d = curr_d;
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}
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if(isLeaf){
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if(d_curr > max_distance){
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max_distance = d_curr;
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fartest = curr;
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}
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}
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}
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std::vector <std::pair<typename MeshType::VertexPointer,typename MeshType::ScalarType> > ::iterator i;
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for(i = expansion.begin(); i!= expansion.end(); ++i)
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{
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TD()[(*i).first].d = (*i).second;
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frontier.push_back((*i).first);
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push_heap(frontier.begin(),frontier.end(),pred());
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} // end for
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}// end while
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// scrivi le distanze sul campo qualita' (nn: farlo parametrico)
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MeshType::VertexIterator vi;
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for(vi = m.vert.begin(); vi != m.vert.end(); ++vi)
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(*vi).Q() = TD()[&(*vi)].d;
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TD().Stop();
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return fartest;
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}
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public:
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static void FartestPoint( MeshType & m,
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std::vector<typename MeshType::VertexPointer> & fro,//insieme di vertici da cui trovare le distanze
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typename MeshType::VertexPointer & fartest, //punto piu'lontano
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double & distance){ //distaza geodesica
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fartest = BuildSP(m,fro,distance,false);
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}
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static void FartestBPoint(
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MeshType & m,
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std::vector<typename MeshType::VertexPointer> & fro, //insieme di vertici da cui trovare le distanze
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typename MeshType::VertexPointer & fartest, //punto piu'lontano
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double & distance){
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fartest = BuildSP(m,fro,distance,true);
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}
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static void DistanceFromBorder( MeshType & m,
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typename MeshType::VertexPointer & v0, //ritorna il vertice piu'lontano da ogni punto sul bordo
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typename MeshType::VertexPointer & v1, // ritorna il vertice di bordo piu'vicino a v0
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double & distance // distanza geodesica tra v0 e v1
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)
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{
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std::vector<typename MeshType::VertexPointer> fro;
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MeshType::VertexIterator vi;
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MeshType::VertexPointer fartest;
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for(vi = m.vert.begin(); vi != m.vert.end(); ++vi)
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if( (*vi).IsB())
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fro.push_back(&(*vi));
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FartestPoint(m,fro,fartest,distance);
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}
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static void MostInternal( MeshType & m,
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typename MeshType::VertexPointer & v0, //ritorna il vertice piu'lontano da ogni punto sul bordo
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typename MeshType::VertexPointer & v1, // ritorna il vertice di bordo piu'vicino a v0
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double & distance // distanza geodesica tra v0 e v1
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)
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{
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std::vector<typename MeshType::VertexPointer> fro;
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MeshType::VertexIterator vi;
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MeshType::VertexPointer fartest;
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for(vi = m.vert.begin(); vi != m.vert.end(); ++vi)
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if( (*vi).IsB())
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fro.push_back(&(*vi));
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FartestPoint(m,fro,fartest,distance);
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fro.clear();
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fro.push_back(fartest);
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FartestBPoint(m,fro,fartest,distance);
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}
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};
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};// end namespace
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