CGAL 5.6.3 - Triangulated Surface Mesh Approximation

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Surface_mesh_approximation/vsa_approximation_2_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/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;
typedef boost::graph_traits<Mesh>::face_descriptor face_descriptor;
typedef Mesh::Property_map<face_descriptor, std::size_t> Face_proxy_pmap;
namespace VSA = CGAL::Surface_mesh_approximation;
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 triangle mesh
std::vector<Kernel::Point_3> anchors;
std::vector<std::array<std::size_t, 3> > triangles; // triplets of indices
// output face proxy index property map
Face_proxy_pmap fpxmap =
mesh.add_property_map<face_descriptor, std::size_t>("f:proxy_id", 0).first;
// output planar proxies
std::vector<Kernel::Vector_3> proxies;
// free function interface with named parameters
VSA::approximate_triangle_mesh(mesh,
CGAL::parameters::min_error_drop(0.05). // seeding with minimum error drop
number_of_iterations(40). // set number of clustering iterations after seeding
subdivision_ratio(0.3). // set chord subdivision ratio threshold when meshing
face_proxy_map(fpxmap). // get face partition map
proxies(std::back_inserter(proxies)). // output proxies
anchors(std::back_inserter(anchors)). // output anchor points
triangles(std::back_inserter(triangles))); // output indexed triangles
return EXIT_SUCCESS;
}
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Surface_mesh
CGAL::Surface_mesh::add_property_map
std::pair< Property_map< I, T >, bool > add_property_map(std::string name=std::string(), const T t=T())
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)
Kernel