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added a stop criterion for the MC-Decimater, so that an endless loop is prevented from occuring if no vertex or face constraints are given

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git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@678 fdac6126-5c0c-442c-9429-916003d36597
This commit is contained in:
Isaak Lim
2012-09-18 10:28:26 +00:00
parent 99c8dca30c
commit e3f061f0f0
1 changed files with 28 additions and 4 deletions
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32
src/OpenMesh/Tools/Decimater/McDecimaterT.cc
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@@ -4,10 +4,10 @@
* Copyright (C) 2001-2011 by Computer Graphics Group, RWTH Aachen * * Copyright (C) 2001-2011 by Computer Graphics Group, RWTH Aachen *
* www.openmesh.org * * www.openmesh.org *
* * * *
*---------------------------------------------------------------------------* *---------------------------------------------------------------------------*
* This file is part of OpenMesh. * * This file is part of OpenMesh. *
* * * *
* OpenMesh is free software: you can redistribute it and/or modify * * OpenMesh is free software: you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as * * it under the terms of the GNU Lesser General Public License as *
* published by the Free Software Foundation, either version 3 of * * published by the Free Software Foundation, either version 3 of *
* the License, or (at your option) any later version with the * * the License, or (at your option) any later version with the *
@@ -33,7 +33,7 @@
\*===========================================================================*/ \*===========================================================================*/
/*===========================================================================*\ /*===========================================================================*\
* * * *
* $Revision: 460 $ * * $Revision: 460 $ *
* $Date: 2011-11-16 10:45:08 +0100 (Mi, 16 Nov 2011) $ * * $Date: 2011-11-16 10:45:08 +0100 (Mi, 16 Nov 2011) $ *
* * * *
@@ -181,13 +181,26 @@ size_t McDecimaterT<Mesh>::decimate_to_faces(size_t _nv, size_t _nf) {
unsigned int nf = mesh_.n_faces(); unsigned int nf = mesh_.n_faces();
unsigned int n_collapses(0); unsigned int n_collapses(0);
while ( (_nv < nv) && (_nf < nf) ) {
// check if no vertex or face contraints were set
bool contraintsOnly = (_nv == 0) && (_nf == 1);
// check if no legal collapses were found three times in a row
// for the sampled halfedges
bool foundNoLegalCollapsesThrice = false;
// store the last two amount of legal collapses found
int lastLegalCollapses = -1;
int beforeLastLegalCollapses = -1;
while ( (contraintsOnly && !foundNoLegalCollapsesThrice) && (_nv < nv) && (_nf < nf) ) {
// Optimal id and value will be collected during the random sampling // Optimal id and value will be collected during the random sampling
typename Mesh::HalfedgeHandle bestHandle(-1); typename Mesh::HalfedgeHandle bestHandle(-1);
double bestEnergy = FLT_MAX; double bestEnergy = FLT_MAX;
// Generate random samples for collapses // Generate random samples for collapses
unsigned int legalCollapses = 0;
for ( unsigned int i = 0; i < randomSamples_; ++i) { for ( unsigned int i = 0; i < randomSamples_; ++i) {
// Random halfedge handle // Random halfedge handle
@@ -200,6 +213,7 @@ size_t McDecimaterT<Mesh>::decimate_to_faces(size_t _nv, size_t _nf) {
// Check if legal we analyze the priority of this collapse operation // Check if legal we analyze the priority of this collapse operation
if (this->is_collapse_legal(ci)) { if (this->is_collapse_legal(ci)) {
++legalCollapses;
double energy = this->collapse_priority(ci); double energy = this->collapse_priority(ci);
// Check if the current samples energy is better than any energy before // Check if the current samples energy is better than any energy before
@@ -214,6 +228,15 @@ size_t McDecimaterT<Mesh>::decimate_to_faces(size_t _nv, size_t _nf) {
} }
if (contraintsOnly) {
// check if no legal collapses were found three times in a row
foundNoLegalCollapsesThrice = (beforeLastLegalCollapses == 0) && (lastLegalCollapses == 0) && (legalCollapses == 0);
// store amount of last legal collapses found
beforeLastLegalCollapses = lastLegalCollapses;
lastLegalCollapses = legalCollapses;
}
// Found the best energy? // Found the best energy?
if ( bestEnergy != FLT_MAX ) { if ( bestEnergy != FLT_MAX ) {
@@ -236,6 +259,7 @@ size_t McDecimaterT<Mesh>::decimate_to_faces(size_t _nv, size_t _nf) {
else else
nf -= 2; nf -= 2;
// pre-processing // pre-processing
this->preprocess_collapse(ci); this->preprocess_collapse(ci);