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#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/hierarchy_simplify_point_set.h>
#include <CGAL/IO/read_xyz_points.h>
#include <CGAL/IO/write_xyz_points.h>
#include <CGAL/Timer.h>
#include <CGAL/Memory_sizer.h>
#include <vector>
#include <fstream>
// types
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef Kernel::Point_3 Point;
int main(int argc, char*argv[])
{
// Reads a .xyz point set file in points[].
std::vector<Point> points;
const char* fname = (argc>1)?argv[1]:"data/oni.xyz";
std::ifstream stream(fname);
if (!stream ||
!CGAL::read_xyz_points(stream, std::back_inserter(points)))
{
std::cerr << "Error: cannot read file " << fname << std::endl;
return EXIT_FAILURE;
}
std::cout << "Read " << points.size () << " point(s)" << std::endl;
CGAL::Timer task_timer; task_timer.start();
// simplification by clustering using erase-remove idiom
points.erase (CGAL::hierarchy_simplify_point_set (points.begin (), points.end (),
100, // Max cluster size
0.01), // Max surface variation
points.end ());
std::size_t memory = CGAL::Memory_sizer().virtual_size();
std::cout << points.size () << " point(s) kept, computed in "
<< task_timer.time() << " seconds, "
<< (memory>>20) << " Mib allocated." << std::endl;
std::ofstream f ("out.xyz");
CGAL::write_xyz_points (f, points.begin (), points.end ());
return EXIT_SUCCESS;
}
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