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#include <CGAL/Simple_cartesian.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Surface_mesh_simplification/edge_collapse.h>
#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/Edge_count_ratio_stop_predicate.h>
#include <chrono>
#include <fstream>
#include <iostream>
typedef CGAL::Simple_cartesian<double> Kernel;
typedef Kernel::Point_3 Point_3;
typedef CGAL::Surface_mesh<Point_3> Surface_mesh;
namespace SMS = CGAL::Surface_mesh_simplification;
int main(int argc, char** argv)
{
Surface_mesh surface_mesh;
const std::string filename = (argc > 1) ? argv[1] : CGAL::data_file_path("meshes/cube-meshed.off");
if(!CGAL::IO::read_polygon_mesh(filename, surface_mesh))
{
std::cerr << "Failed to read input mesh: " << filename << std::endl;
return EXIT_FAILURE;
}
if(!CGAL::is_triangle_mesh(surface_mesh))
{
std::cerr << "Input geometry is not triangulated." << std::endl;
return EXIT_FAILURE;
}
std::chrono::steady_clock::time_point start_time = std::chrono::steady_clock::now();
std::cout << num_vertices(surface_mesh) << " vertices, " << num_edges(surface_mesh) << " edges (BEFORE)" << std::endl;
// In this example, the simplification stops when the number of undirected edges
// drops below 10% of the initial count
double stop_ratio = (argc > 2) ? std::stod(argv[2]) : 0.1;
SMS::Edge_count_ratio_stop_predicate<Surface_mesh> stop(stop_ratio);
int r = SMS::edge_collapse(surface_mesh, stop);
std::chrono::steady_clock::time_point end_time = std::chrono::steady_clock::now();
std::cout << "\nFinished!\n" << r << " edges removed.\n" << surface_mesh.number_of_edges() << " final edges.\n";
std::cout << "Time elapsed: " << std::chrono::duration_cast<std::chrono::milliseconds>(end_time - start_time).count() << "ms" << std::endl;
CGAL::IO::write_polygon_mesh((argc > 3) ? argv[3] : "out.off", surface_mesh, CGAL::parameters::stream_precision(17));
return EXIT_SUCCESS;
}
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