CGAL 5.4.4 - Polygon Mesh Processing
Polygon_mesh_processing/mesh_slicer_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Polygon_mesh_slicer.h>
#include <CGAL/Polygon_mesh_processing/IO/polygon_mesh_io.h>
#include <CGAL/AABB_halfedge_graph_segment_primitive.h>
#include <CGAL/AABB_tree.h>
#include <CGAL/AABB_traits.h>
#include <fstream>
typedef std::vector<K::Point_3> Polyline_type;
typedef std::list<Polyline_type> Polylines;
typedef CGAL::AABB_traits<K, HGSP> AABB_traits;
typedef CGAL::AABB_tree<AABB_traits> AABB_tree;
int main(int argc, char* argv[])
{
const std::string filename = (argc > 1) ? argv[1] : CGAL::data_file_path("meshes/eight.off");
Mesh mesh;
if(!PMP::IO::read_polygon_mesh(filename, mesh) || CGAL::is_empty(mesh) || !CGAL::is_triangle_mesh(mesh))
{
std::cerr << "Invalid input." << std::endl;
return 1;
}
// Slicer constructor from the mesh
Polylines polylines;
slicer(K::Plane_3(0, 0, 1, -0.4), std::back_inserter(polylines));
std::cout << "At z = 0.4, the slicer intersects "
<< polylines.size() << " polylines" << std::endl;
polylines.clear();
slicer(K::Plane_3(0, 0, 1, 0.2), std::back_inserter(polylines));
std::cout << "At z = -0.2, the slicer intersects "
<< polylines.size() << " polylines" << std::endl;
polylines.clear();
// Use the Slicer constructor from a pre-built AABB_tree
AABB_tree tree(edges(mesh).first, edges(mesh).second, mesh);
CGAL::Polygon_mesh_slicer<Mesh, K> slicer_aabb(mesh, tree);
slicer_aabb(K::Plane_3(0, 0, 1, -0.4), std::back_inserter(polylines));
std::cout << "At z = 0.4, the slicer intersects "
<< polylines.size() << " polylines" << std::endl;
polylines.clear();
return 0;
}