\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)
CGAL 5.0.1 - Polygon Mesh Processing
Polygon_mesh_processing/orient_polygon_soup_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/Polyhedron_items_with_id_3.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/IO/OFF_reader.h>
#include <vector>
#include <fstream>
#include <iostream>
int main(int argc, char* argv[])
{
const char* filename = (argc > 1) ? argv[1] : "data/tet-shuffled.off";
std::ifstream input(filename);
std::vector<K::Point_3> points;
std::vector<std::vector<std::size_t> > polygons;
if(!input || !CGAL::read_OFF(input, points, polygons) || points.empty())
{
std::cerr << "Cannot open file " << std::endl;
return EXIT_FAILURE;
}
Polyhedron mesh;
// Number the faces because 'orient_to_bound_a_volume' needs a face <--> index map
int index = 0;
for(Polyhedron::Face_iterator fb=mesh.facets_begin(), fe=mesh.facets_end(); fb!=fe; ++fb)
fb->id() = index++;
if(CGAL::is_closed(mesh))
std::ofstream out("tet-oriented1.off");
out << mesh;
out.close();
std::ofstream out2("tet-oriented2.off");
out2 << mesh;
out2.close();
return EXIT_SUCCESS;
}