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#include <CGAL/Simple_cartesian.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Surface_mesh_simplification/edge_collapse.h>
#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/Edge_count_stop_predicate.h>
#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/LindstromTurk_cost.h>
#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/LindstromTurk_placement.h>
#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/Bounded_normal_change_filter.h>
#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/Polyhedral_envelope_filter.h>
//bbox
#include <CGAL/Polygon_mesh_processing/bbox.h>
#include <iostream>
#include <fstream>
namespace SMS = CGAL::Surface_mesh_simplification;
typedef CGAL::Simple_cartesian<double> Kernel;
typedef Kernel::Point_3 Point_3;
typedef CGAL::Surface_mesh<Point_3> Surface;
typedef SMS::LindstromTurk_cost<Surface> Cost;
typedef SMS::LindstromTurk_placement<Surface> Placement;
typedef SMS::Polyhedral_envelope_filter<Kernel,SMS::Bounded_normal_change_filter<> > Filter;
int main(int argc, char** argv)
{
Surface mesh;
std::ifstream is(argc > 1 ? argv[1] : CGAL::data_file_path("meshes/helmet.off"));
is >> mesh;
SMS::Edge_count_stop_predicate<Surface> stop(0); // go as far as you can while in the envelope
CGAL::Iso_cuboid_3<Kernel> bbox(CGAL::Polygon_mesh_processing::bbox(mesh));
Point_3 cmin = (bbox.min)();
Point_3 cmax = (bbox.max)();
const double diag = CGAL::approximate_sqrt(CGAL::squared_distance(cmin, cmax));
std::cout << "eps = " << 0.01*diag << std::endl;
Placement placement;
Filter filter(0.01*diag);
SMS::edge_collapse(mesh, stop, CGAL::parameters::get_cost(Cost()).filter(filter).get_placement(placement));
std::ofstream out("out.off");
out << mesh << std::endl;
out.close();
return EXIT_SUCCESS;
}
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