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Decimation.cpp
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Decimation.cpp
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/***************************************************************************
* Copyright (c) 2013 Werner Mayer <wmayer[at]users.sourceforge.net> *
* *
* This file is part of the FreeCAD CAx development system. *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Library General Public *
* License as published by the Free Software Foundation; either *
* version 2 of the License, or (at your option) any later version. *
* *
* This library 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 Library General Public License for more details. *
* *
* You should have received a copy of the GNU Library General Public *
* License along with this library; see the file COPYING.LIB. If not, *
* write to the Free Software Foundation, Inc., 59 Temple Place, *
* Suite 330, Boston, MA 02111-1307, USA *
* *
***************************************************************************/
#include "PreCompiled.h"
#ifndef _PreComp_
#endif
#include "Decimation.h"
#include "MeshKernel.h"
#include "Algorithm.h"
#include "Iterator.h"
#include "TopoAlgorithm.h"
#include <Base/Tools.h>
#include "Simplify.h"
using namespace MeshCore;
MeshSimplify::MeshSimplify(MeshKernel& mesh)
: myKernel(mesh)
{
}
MeshSimplify::~MeshSimplify()
{
}
void MeshSimplify::simplify(float tolerance, float reduction)
{
Simplify alg;
const MeshPointArray& points = myKernel.GetPoints();
for (std::size_t i = 0; i < points.size(); i++) {
Simplify::Vertex v;
v.p = points[i];
alg.vertices.push_back(v);
}
const MeshFacetArray& facets = myKernel.GetFacets();
for (std::size_t i = 0; i < facets.size(); i++) {
Simplify::Triangle t;
for (int j = 0; j < 3; j++)
t.v[j] = facets[i]._aulPoints[j];
alg.triangles.push_back(t);
}
int target_count = static_cast<int>(static_cast<float>(facets.size()) * (1.0f-reduction));
// Simplification starts
alg.simplify_mesh(target_count, tolerance);
// Simplification done
MeshPointArray new_points;
new_points.reserve(alg.vertices.size());
for (std::size_t i = 0; i < alg.vertices.size(); i++) {
new_points.push_back(alg.vertices[i].p);
}
std::size_t numFacets = 0;
for (std::size_t i = 0; i < alg.triangles.size(); i++) {
if (!alg.triangles[i].deleted)
numFacets++;
}
MeshFacetArray new_facets;
new_facets.reserve(numFacets);
for (std::size_t i = 0; i < alg.triangles.size(); i++) {
if (!alg.triangles[i].deleted) {
MeshFacet face;
face._aulPoints[0] = alg.triangles[i].v[0];
face._aulPoints[1] = alg.triangles[i].v[1];
face._aulPoints[2] = alg.triangles[i].v[2];
new_facets.push_back(face);
}
}
myKernel.Adopt(new_points, new_facets, true);
}
void MeshSimplify::simplify(int targetSize)
{
Simplify alg;
const MeshPointArray& points = myKernel.GetPoints();
for (std::size_t i = 0; i < points.size(); i++) {
Simplify::Vertex v;
v.p = points[i];
alg.vertices.push_back(v);
}
const MeshFacetArray& facets = myKernel.GetFacets();
for (std::size_t i = 0; i < facets.size(); i++) {
Simplify::Triangle t;
for (int j = 0; j < 3; j++)
t.v[j] = facets[i]._aulPoints[j];
alg.triangles.push_back(t);
}
// Simplification starts
alg.simplify_mesh(targetSize, FLT_MAX);
// Simplification done
MeshPointArray new_points;
new_points.reserve(alg.vertices.size());
for (std::size_t i = 0; i < alg.vertices.size(); i++) {
new_points.push_back(alg.vertices[i].p);
}
std::size_t numFacets = 0;
for (std::size_t i = 0; i < alg.triangles.size(); i++) {
if (!alg.triangles[i].deleted)
numFacets++;
}
MeshFacetArray new_facets;
new_facets.reserve(numFacets);
for (std::size_t i = 0; i < alg.triangles.size(); i++) {
if (!alg.triangles[i].deleted) {
MeshFacet face;
face._aulPoints[0] = alg.triangles[i].v[0];
face._aulPoints[1] = alg.triangles[i].v[1];
face._aulPoints[2] = alg.triangles[i].v[2];
new_facets.push_back(face);
}
}
myKernel.Adopt(new_points, new_facets, true);
}