Point_set_processing_3/read_ply_points_with_colors_example.cpp

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/property_map.h>
#include <CGAL/IO/read_ply_points.h>

#include <utility>
#include <vector>
#include <fstream>

// types
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef Kernel::FT FT;
typedef Kernel::Point_3 Point;
typedef Kernel::Vector_3 Vector;
typedef CGAL::cpp11::array<unsigned char, 3> Color;

// Point with normal, color and intensity
typedef CGAL::cpp11::tuple<Point, Vector, Color, int> PNCI;
typedef CGAL::Nth_of_tuple_property_map<0, PNCI> Point_map;
typedef CGAL::Nth_of_tuple_property_map<1, PNCI> Normal_map;
typedef CGAL::Nth_of_tuple_property_map<2, PNCI> Color_map;
typedef CGAL::Nth_of_tuple_property_map<3, PNCI> Intensity_map;

int main(int argc, char*argv[])
{
  const char* fname = (argc>1) ? argv[1] : "data/colors.ply";
    // Reads a .ply point set file with normal vectors and colors

  std::vector<PNCI> points; // store points
  std::ifstream in(fname);

  if (!in ||
      !CGAL::read_ply_points_with_properties
      (in,
       std::back_inserter (points),
       CGAL::make_ply_point_reader (Point_map()),
       std::make_pair (Intensity_map(),
                       CGAL::PLY_property<int>("intensity")),
       std::make_tuple (Color_map(),
                        CGAL::Construct_array(),
                        CGAL::PLY_property<unsigned char>("red"),
                        CGAL::PLY_property<unsigned char>("green"),
                        CGAL::PLY_property<unsigned char>("blue")),
       CGAL::make_ply_normal_reader (Normal_map())
       ))
    {
      std::cerr << "Error: cannot read file " << fname << std::endl;
      return EXIT_FAILURE;
    }

  // Display points read
  for (std::size_t i = 0; i < points.size (); ++ i)
    {
      const Point& p = get<0>(points[i]);
      const Vector& n = get<1>(points[i]);
      const Color& c = get<2>(points[i]);
      int I = get<3>(points[i]);
      std::cerr << "Point (" << p << ") with normal (" << n
                << "), color (" << int(c[0]) << " " << int(c[1]) << " " << int(c[2])
                << ") and intensity " << I << std::endl;
    }
  
  return EXIT_SUCCESS;
}