CGAL 5.6.3 - Triangulated Surface Mesh Approximation

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Surface_mesh_approximation/vsa_approximation_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Surface_mesh_approximation/approximate_triangle_mesh.h>
#include <CGAL/Polygon_mesh_processing/orient_polygon_soup.h>
#include <CGAL/Polygon_mesh_processing/polygon_soup_to_polygon_mesh.h>
#include <CGAL/Polygon_mesh_processing/orientation.h>
#include <CGAL/Polygon_mesh_processing/IO/polygon_mesh_io.h>
#include <iostream>
#include <fstream>
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef CGAL::Surface_mesh<Kernel::Point_3> Mesh;
namespace VSA = CGAL::Surface_mesh_approximation;
namespace PMP = CGAL::Polygon_mesh_processing;
int main(int argc, char** argv)
{
const std::string filename = (argc > 1) ? argv[1] : CGAL::data_file_path("meshes/bear.off");
// read input surface triangle mesh
Mesh mesh;
if(!CGAL::Polygon_mesh_processing::IO::read_polygon_mesh(filename, mesh) ||
!CGAL::is_triangle_mesh(mesh))
{
std::cerr << "Invalid input file." << std::endl;
return EXIT_FAILURE;
}
// output indexed triangles
std::vector<Kernel::Point_3> anchors;
std::vector<std::array<std::size_t, 3> > triangles; // triplets of indices
// free function interface with named parameters
bool is_manifold = VSA::approximate_triangle_mesh(mesh,
CGAL::parameters::seeding_method(VSA::HIERARCHICAL). // hierarchical seeding
max_number_of_proxies(200). // seeding with maximum number of proxies
number_of_iterations(30). // number of clustering iterations after seeding
anchors(std::back_inserter(anchors)). // anchor vertices
triangles(std::back_inserter(triangles))); // indexed triangles
std::cout << "#anchor vertices: " << anchors.size() << std::endl;
std::cout << "#triangles: " << triangles.size() << std::endl;
if (is_manifold) {
std::cout << "oriented, 2-manifold output." << std::endl;
// convert from soup to surface mesh
PMP::orient_polygon_soup(anchors, triangles);
Mesh output;
PMP::polygon_soup_to_polygon_mesh(anchors, triangles, output);
if (CGAL::is_closed(output) && (!PMP::is_outward_oriented(output)))
PMP::reverse_face_orientations(output);
std::ofstream out("dump.off");
out << output;
out.close();
}
return EXIT_SUCCESS;
}
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Surface_mesh
CGAL::Polygon_mesh_processing::IO::read_polygon_mesh
bool read_polygon_mesh(const std::string &fname, PolygonMesh &g, const NamedParameters &np=parameters::default_values())
CGAL::is_triangle_mesh
bool is_triangle_mesh(const FaceGraph &g)
CGAL::is_closed
bool is_closed(const FaceGraph &g)
Kernel
CGAL::Polygon_mesh_processing