\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)
CGAL 4.13.2 - Polygon Mesh Processing
Polygon_mesh_processing/self_intersections_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Polygon_mesh_processing/self_intersections.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/pig.off";
std::ifstream input(filename);
Mesh mesh;
if (!input || !(input >> mesh) || !CGAL::is_triangle_mesh(mesh))
{
std::cerr << "Not a valid input file." << std::endl;
return 1;
}
bool intersecting = PMP::does_self_intersect(mesh,
PMP::parameters::vertex_point_map(get(CGAL::vertex_point, mesh)));
std::cout
<< (intersecting ? "There are self-intersections." : "There is no self-intersection.")
<< std::endl;
std::vector<std::pair<face_descriptor, face_descriptor> > intersected_tris;
PMP::self_intersections(mesh, std::back_inserter(intersected_tris));
std::cout << intersected_tris.size() << " pairs of triangles intersect." << std::endl;
return 0;
}