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#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/optimal_bounding_box.h>
#include <CGAL/Polygon_mesh_processing/triangulate_faces.h>
#include <CGAL/Polygon_mesh_processing/measure.h>
#include <CGAL/Polygon_mesh_processing/IO/polygon_mesh_io.h>
#include <CGAL/Real_timer.h>
#include <fstream>
#include <iostream>
namespace PMP = CGAL::Polygon_mesh_processing;
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef K::Point_3 Point;
typedef CGAL::Surface_mesh<Point> Surface_mesh;
int main(int argc, char** argv)
{
const std::string filename = (argc > 1) ? argv[1] : CGAL::data_file_path("meshes/pig.off");
Surface_mesh sm;
if(!PMP::IO::read_polygon_mesh(filename, sm) || sm.is_empty())
{
std::cerr << "Invalid input file." << std::endl;
return EXIT_FAILURE;
}
CGAL::Real_timer timer;
timer.start();
// Compute the extreme points of the mesh, and then a tightly fitted oriented bounding box
std::array<Point, 8> obb_points;
CGAL::oriented_bounding_box(sm, obb_points,
CGAL::parameters::use_convex_hull(true));
std::cout << "Elapsed time: " << timer.time() << std::endl;
// Make a mesh out of the oriented bounding box
Surface_mesh obb_sm;
CGAL::make_hexahedron(obb_points[0], obb_points[1], obb_points[2], obb_points[3],
obb_points[4], obb_points[5], obb_points[6], obb_points[7], obb_sm);
std::ofstream("obb.off") << obb_sm;
PMP::triangulate_faces(obb_sm);
std::cout << "Volume: " << PMP::volume(obb_sm) << std::endl;
return EXIT_SUCCESS;
}
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