CGAL 4.7 - Triangulated Surface Mesh Simplification: Surface_mesh_simplification/edge_collapse_polyhedron.cpp

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CGAL 4.7 - Triangulated Surface Mesh Simplification

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Surface_mesh_simplification/edge_collapse_polyhedron.cpp
#include <iostream>
#include <fstream>
#include <CGAL/Simple_cartesian.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/IO/Polyhedron_iostream.h>
#include <CGAL/boost/graph/graph_traits_Polyhedron_3.h>
// Simplification function
#include <CGAL/Surface_mesh_simplification/edge_collapse.h>
// Stop-condition policy
#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/Count_stop_predicate.h>
#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/Edge_length_cost.h>
#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/Midpoint_placement.h>
typedef CGAL::Simple_cartesian<double> Kernel;
typedef CGAL::Polyhedron_3<Kernel> Surface_mesh;
namespace SMS = CGAL::Surface_mesh_simplification ;
int main( int argc, char** argv )
{
Surface_mesh surface_mesh;
std::ifstream is(argv[1]) ; is >> surface_mesh ;
// This is a stop predicate (defines when the algorithm terminates).
// In this example, the simplification stops when the number of undirected edges
// left in the surface mesh drops below the specified number (1000)
SMS::Count_stop_predicate<Surface_mesh> stop(1000);
// This the actual call to the simplification algorithm.
// The surface mesh and stop conditions are mandatory arguments.
// The index maps are needed because the vertices and edges
// of this surface mesh lack an "id()" field.
int r = SMS::edge_collapse
(surface_mesh
,stop
,CGAL::parameters::vertex_index_map(get(CGAL::vertex_external_index,surface_mesh))
.halfedge_index_map (get(CGAL::halfedge_external_index ,surface_mesh))
.get_cost (SMS::Edge_length_cost <Surface_mesh>())
.get_placement(SMS::Midpoint_placement<Surface_mesh>())
);
std::cout << "\nFinished...\n" << r << " edges removed.\n"
<< (surface_mesh.size_of_halfedges()/2) << " final edges.\n" ;
std::ofstream os( argc > 2 ? argv[2] : "out.off" ) ; os << surface_mesh ;
return 0 ;
}
// EOF //