Point_set_3/point_set_read_ply.cpp

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
 
#include <CGAL/Point_set_3.h>
 
#include <fstream>
#include <limits>
 
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef Kernel::FT FT;
typedef Kernel::Point_3 Point;
typedef Kernel::Vector_3 Vector;
 
typedef CGAL::Point_set_3<Point> Point_set;
 
int main (int argc, char** argv)
{
  std::ifstream f(argc > 1 ? argv[1] : CGAL::data_file_path("points_3/example.ply"),
                  std::ios_base::binary); // Mandatory on Windows if input is binary PLY
 
  Point_set point_set;
 
  if(!CGAL::IO::read_PLY(f, point_set)) // same as `f >> point_set`
  {
    std::cerr << "Can't read input file " << std::endl;
    return EXIT_FAILURE;
  }
 
  // Shows which properties are defined
  std::vector<std::string> properties = point_set.properties();
  std::cerr << "Properties:" << std::endl;
  for(std::size_t i = 0; i < properties.size(); ++ i)
    std::cerr << " * " << properties[i] << std::endl;
 
  // Recover "label" property of type int
  std::optional<Point_set::Property_map<std::int32_t>> label_prop = point_set.property_map<std::int32_t> ("label");
 
  if(label_prop.has_value())
  {
    std::cerr << "Point set has an integer \"label\" property with values:" << std::endl;
    for (Point_set::iterator it = point_set.begin(); it != point_set.end(); ++ it)
      std::cerr << " * " << (*label_prop)[*it] << std::endl;
  }
 
  if(argc > 2 && strcmp (argv[2], "-b") == 0) // Optional binary output
  {
    CGAL::IO::write_PLY("out.ply", point_set, CGAL::parameters::stream_precision(17));
  }
  else // ASCII output
  {
    CGAL::IO::write_PLY("out.ply", point_set, CGAL::parameters::stream_precision(17)
                                                           .use_binary_mode(false));
  }
 
  return 0;
}