Point_set_processing_3/edge_aware_upsample_point_set_example.cpp

#include <CGAL/Simple_cartesian.h>
 
#include <CGAL/edge_aware_upsample_point_set.h>
#include <CGAL/IO/read_points.h>
#include <CGAL/IO/write_points.h>
 
#include <vector>
#include <fstream>
 
// types
typedef CGAL::Simple_cartesian<double> Kernel;
typedef Kernel::Point_3 Point;
typedef Kernel::Vector_3 Vector;
 
// Point with normal vector stored in a std::pair.
typedef std::pair<Point, Vector> PointVectorPair;
 
// Concurrency
typedef CGAL::Parallel_if_available_tag Concurrency_tag;
 
int main(int argc, char* argv[])
{
  const std::string input_filename = (argc>1) ? argv[1] : CGAL::data_file_path("points_3/before_upsample.xyz");
  const char* output_filename = (argc>2) ? argv[2] : "data/before_upsample_UPSAMPLED.xyz";
 
  // Reads a .xyz point set file in points[], *with normals*.
  std::vector<PointVectorPair> points;
  if(!CGAL::IO::read_points(input_filename,
                            std::back_inserter(points),
                            CGAL::parameters::point_map(CGAL::First_of_pair_property_map<PointVectorPair>())
                                             .normal_map(CGAL::Second_of_pair_property_map<PointVectorPair>())))
  {
    std::cerr << "Error: cannot read file " << input_filename << std::endl;
    return EXIT_FAILURE;
  }
 
  //Algorithm parameters
  const double sharpness_angle = 25;   // control sharpness of the result.
  const double edge_sensitivity = 0;    // higher values will sample more points near the edges
  const double neighbor_radius = 0.25;  // initial size of neighborhood.
  const std::size_t number_of_output_points = points.size() * 4;
 
   //Run algorithm
  CGAL::edge_aware_upsample_point_set<Concurrency_tag>(
    points,
    std::back_inserter(points),
    CGAL::parameters::point_map(CGAL::First_of_pair_property_map<PointVectorPair>()).
    normal_map(CGAL::Second_of_pair_property_map<PointVectorPair>()).
    sharpness_angle(sharpness_angle).
    edge_sensitivity(edge_sensitivity).
    neighbor_radius(neighbor_radius).
    number_of_output_points(number_of_output_points));
 
  // Saves point set.
  if(!CGAL::IO::write_points(output_filename, points,
                             CGAL::parameters::point_map(CGAL::First_of_pair_property_map<PointVectorPair>())
                                              .normal_map(CGAL::Second_of_pair_property_map<PointVectorPair>())
                                              .stream_precision(17)))
    return EXIT_FAILURE;
 
  return EXIT_SUCCESS;
}