CGAL 5.2.1 - Polygon Mesh Processing
Polygon_mesh_processing/detect_features_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Polygon_mesh_processing/detect_features.h>
#include <fstream>
typedef boost::graph_traits<Mesh>::face_descriptor face_descriptor;
int main(int argc, char* argv[])
{
const char* filename = (argc > 1) ? argv[1] : "data/P.off";
std::ifstream input(filename);
Mesh mesh;
if (!input || !(input >> mesh))
{
std::cerr << "Not a valid input file." << std::endl;
return 1;
}
typedef boost::property_map<Mesh, CGAL::edge_is_feature_t>::type EIFMap;
typedef boost::property_map<Mesh, CGAL::face_patch_id_t<int> >::type PIMap;
typedef boost::property_map<Mesh, CGAL::vertex_incident_patches_t<int> >::type VIMap;
EIFMap eif = get(CGAL::edge_is_feature, mesh);
PIMap pid = get(CGAL::face_patch_id_t<int>(), mesh);
VIMap vip = get(CGAL::vertex_incident_patches_t<int>(), mesh);
std::size_t number_of_patches
= PMP::sharp_edges_segmentation(mesh, 90, eif, pid,
PMP::parameters::vertex_incident_patches_map(vip));
std::size_t nb_sharp_edges = 0;
for(boost::graph_traits<Mesh>::edge_descriptor e : edges(mesh))
{
if(get(eif, e))
++nb_sharp_edges;
}
std::cout<<"This mesh contains "<<nb_sharp_edges<<" sharp edges"<<std::endl;
std::cout<<" and "<<number_of_patches<<" surface patches."<<std::endl;
return 0;
}