CGAL 6.2 - Triangulated Surface Mesh Simplification

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Surface_mesh_simplification/edge_collapse_garland_heckbert.cpp
#include <CGAL/Simple_cartesian.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/Edge_count_ratio_stop_predicate.h>
#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/Bounded_normal_change_filter.h>
#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/GarlandHeckbert_policies.h>
#include <CGAL/Surface_mesh_simplification/edge_collapse.h>
#include <CGAL/IO/polygon_mesh_io.h>
#include <chrono>
#include <fstream>
#include <iostream>
#include <vector>
typedef CGAL::Simple_cartesian<double> Kernel;
typedef Kernel::FT FT;
typedef Kernel::Point_3 Point_3;
typedef CGAL::Surface_mesh<Point_3> Surface_mesh;
namespace SMS = CGAL::Surface_mesh_simplification;
typedef SMS::GarlandHeckbert_plane_policies<Surface_mesh, Kernel> Classic_plane;
typedef SMS::GarlandHeckbert_probabilistic_plane_policies<Surface_mesh, Kernel> Prob_plane;
typedef SMS::GarlandHeckbert_triangle_policies<Surface_mesh, Kernel> Classic_tri;
typedef SMS::GarlandHeckbert_probabilistic_triangle_policies<Surface_mesh, Kernel> Prob_tri;
typedef SMS::GarlandHeckbert_plane_and_line_policies<Surface_mesh, Kernel> Plane_and_line;
template <typename GHPolicies>
void collapse_gh(Surface_mesh& mesh,
const double ratio)
{
std::chrono::steady_clock::time_point start_time = std::chrono::steady_clock::now();
SMS::Edge_count_ratio_stop_predicate<Surface_mesh> stop(ratio);
// Garland&Heckbert simplification policies
typedef typename GHPolicies::Get_cost GH_cost;
typedef typename GHPolicies::Get_placement GH_placement;
typedef SMS::Bounded_normal_change_filter<> Filter;
GHPolicies gh_policies(mesh);
const GH_cost& gh_cost = gh_policies.get_cost();
const GH_placement& gh_placement = gh_policies.get_placement();
Filter filter;
int r = SMS::edge_collapse(mesh, stop,
CGAL::parameters::get_cost(gh_cost)
.filter(filter)
.get_placement(gh_placement));
std::chrono::steady_clock::time_point end_time = std::chrono::steady_clock::now();
std::cout << "Time elapsed: "
<< std::chrono::duration_cast<std::chrono::milliseconds>(end_time - start_time).count()
<< "ms" << std::endl;
std::cout << "\nFinished!\n" << r << " edges removed.\n" << edges(mesh).size() << " final edges.\n";
}
// Usage:
// ./command [input] [ratio] [policy] [output]
// policy can be "cp" (classic plane), "ct" (classic triangle), "pp" (probabilistic plane), "pt" (probabilistic triangle), "pl" (plane and line)
int main(int argc, char** argv)
{
Surface_mesh mesh;
const std::string filename = (argc > 1) ? argv[1] : CGAL::data_file_path("meshes/cube-subdivided.off");
if(!CGAL::IO::read_polygon_mesh(filename, mesh))
{
std::cerr << "Failed to read input mesh: " << filename << std::endl;
return EXIT_FAILURE;
}
if(!CGAL::is_triangle_mesh(mesh))
{
std::cerr << "Input geometry is not triangulated." << std::endl;
return EXIT_FAILURE;
}
std::cout << "Input mesh has " << num_vertices(mesh) << " nv "
<< num_edges(mesh) << " ne "
<< num_faces(mesh) << " nf" << std::endl;
const double ratio = (argc > 2) ? std::stod(argv[2]) : 0.2;
std::cout << "Collapsing edges of mesh: " << filename << ", aiming for " << 100 * ratio << "% of the input edges..." << std::endl;
const std::string policy = (argc > 3) ? argv[3] : "cp";
if(policy == "cp")
collapse_gh<Classic_plane>(mesh, ratio);
else if(policy == "ct")
collapse_gh<Classic_tri>(mesh, ratio);
else if(policy == "pp")
collapse_gh<Prob_plane>(mesh, ratio);
else if(policy == "pt")
collapse_gh<Prob_tri>(mesh, ratio);
else
collapse_gh<Plane_and_line>(mesh, ratio);
CGAL::IO::write_polygon_mesh((argc > 4) ? argv[4] : "out.off", mesh, CGAL::parameters::stream_precision(17));
return EXIT_SUCCESS;
}
CGAL::Surface_mesh
Kernel::Point_3
CGAL::is_triangle_mesh
bool is_triangle_mesh(const FaceGraph &g)
CGAL::IO::read_polygon_mesh
bool read_polygon_mesh(const std::string &fname, Graph &g, const NamedParameters &np=parameters::default_values())
CGAL::IO::write_polygon_mesh
bool write_polygon_mesh(const std::string &fname, Graph &g, const NamedParameters &np=parameters::default_values())
CGAL::Surface_mesh_simplification
Definition: edge_collapse.h:2
Kernel
CGAL::Simple_cartesian