CGAL 4.7 - Triangulated Surface Mesh Segmentation: Surface_mesh_segmentation/sdf_values_example.cpp

\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.7 - Triangulated Surface Mesh Segmentation

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Surface_mesh_segmentation/sdf_values_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/boost/graph/graph_traits_Polyhedron_3.h>
#include <CGAL/IO/Polyhedron_iostream.h>
#include <CGAL/mesh_segmentation.h>
#include <CGAL/property_map.h>
#include <iostream>
#include <fstream>
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef CGAL::Polyhedron_3<Kernel> Polyhedron;
int main()
{
// create and read Polyhedron
Polyhedron mesh;
std::ifstream input("data/cactus.off");
if ( !input || !(input >> mesh) || mesh.empty() ) {
std::cerr << "Not a valid off file." << std::endl;
return EXIT_FAILURE;
}
// create a property-map
typedef std::map<Polyhedron::Facet_const_handle, double> Facet_double_map;
Facet_double_map internal_map;
boost::associative_property_map<Facet_double_map> sdf_property_map(internal_map);
// compute SDF values
std::pair<double, double> min_max_sdf = CGAL::sdf_values(mesh, sdf_property_map);
// It is possible to compute the raw SDF values and post-process them using
// the following lines:
// const std::size_t number_of_rays = 25; // cast 25 rays per facet
// const double cone_angle = 2.0 / 3.0 * CGAL_PI; // set cone opening-angle
// CGAL::sdf_values(mesh, sdf_property_map, cone_angle, number_of_rays, false);
// std::pair<double, double> min_max_sdf =
// CGAL::sdf_values_postprocessing(mesh, sdf_property_map);
// print minimum & maximum SDF values
std::cout << "minimum SDF: " << min_max_sdf.first
<< " maximum SDF: " << min_max_sdf.second << std::endl;
// print SDF values
for(Polyhedron::Facet_const_iterator facet_it = mesh.facets_begin();
facet_it != mesh.facets_end(); ++facet_it) {
std::cout << sdf_property_map[facet_it] << " ";
}
std::cout << std::endl;
}