Polygon_mesh_processing/hole_filling_example.cpp

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/Polygon_mesh_processing/triangulate_hole.h>

#include <iostream>
#include <fstream>
#include <vector>
#include <boost/foreach.hpp>

typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef CGAL::Polyhedron_3<Kernel>     Polyhedron;

typedef Polyhedron::Halfedge_handle    Halfedge_handle;
typedef Polyhedron::Facet_handle       Facet_handle;
typedef Polyhedron::Vertex_handle      Vertex_handle;

int main(int argc, char* argv[])
{
  const char* filename = (argc > 1) ? argv[1] : "data/mech-holes-shark.off";
  std::ifstream input(filename);

  Polyhedron poly;
  if ( !input || !(input >> poly) || poly.empty() ) {
    std::cerr << "Not a valid off file." << std::endl;
    return 1;
  }

  // Incrementally fill the holes
  unsigned int nb_holes = 0;
  BOOST_FOREACH(Halfedge_handle h, halfedges(poly))
  {
    if(h->is_border())
    {
      std::vector<Facet_handle>  patch_facets;
      std::vector<Vertex_handle> patch_vertices;
      bool success = CGAL::cpp11::get<0>(
        CGAL::Polygon_mesh_processing::triangulate_refine_and_fair_hole(
                  poly,
                  h,
                  std::back_inserter(patch_facets),
                  std::back_inserter(patch_vertices),
     CGAL::Polygon_mesh_processing::parameters::vertex_point_map(get(CGAL::vertex_point, poly)).
                  geom_traits(Kernel())) );

      std::cout << " Number of facets in constructed patch: " << patch_facets.size() << std::endl;
      std::cout << " Number of vertices in constructed patch: " << patch_vertices.size() << std::endl;
      std::cout << " Fairing : " << (success ? "succeeded" : "failed") << std::endl;
      ++nb_holes;
    }
  }

  std::cout << std::endl;
  std::cout << nb_holes << " holes have been filled" << std::endl;
  
  std::ofstream out("filled.off");
  out.precision(17);
  out << poly << std::endl;
  return 0;
}