Polygonal_surface_reconstruction/polyfit_example_model_complexty_control.cpp

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/IO/read_points.h>
#include <CGAL/property_map.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Polygonal_surface_reconstruction.h>

#ifdef CGAL_USE_SCIP // defined (or not) by CMake scripts, do not define by hand
#include <CGAL/SCIP_mixed_integer_program_traits.h>
typedef CGAL::SCIP_mixed_integer_program_traits<double>                        MIP_Solver;
#elif defined(CGAL_USE_GLPK) // defined (or not) by CMake scripts, do not define by hand
#include <CGAL/GLPK_mixed_integer_program_traits.h>
typedef CGAL::GLPK_mixed_integer_program_traits<double>                        MIP_Solver;
#endif


#if defined(CGAL_USE_GLPK) || defined(CGAL_USE_SCIP)

#include <CGAL/Timer.h>

#include <fstream>


typedef CGAL::Exact_predicates_inexact_constructions_kernel                Kernel;
typedef Kernel::Point_3                                                                                        Point;
typedef Kernel::Vector_3                                                                                Vector;
typedef        CGAL::Polygonal_surface_reconstruction<Kernel>                        Polygonal_surface_reconstruction;
typedef CGAL::Surface_mesh<Point>                                                                Surface_mesh;

// Point with normal, and plane index
typedef boost::tuple<Point, Vector, int>                                                PNI;
typedef CGAL::Nth_of_tuple_property_map<0, PNI>                                        Point_map;
typedef CGAL::Nth_of_tuple_property_map<1, PNI>                                        Normal_map;
typedef CGAL::Nth_of_tuple_property_map<2, PNI>                                        Plane_index_map;

/*
* The following example shows how to control the model complexity by
* increasing the influence of the model complexity term.
* In this example, the intermediate results from plane extraction and
* candidate generation are cached and reused.
*/

int main()
{
    const std::string& input_file("data/building.ply");
  std::ifstream input_stream(input_file.c_str());

  std::vector<PNI> points; // store points

  std::cout << "Loading point cloud: " << input_file << "...";
  CGAL::Timer t;
  t.start();

  if (!CGAL::IO::read_PLY_with_properties(input_stream,
                                          std::back_inserter(points),
                                          CGAL::make_ply_point_reader(Point_map()),
                                          CGAL::make_ply_normal_reader(Normal_map()),
                                          std::make_pair(Plane_index_map(), CGAL::PLY_property<int>("segment_index"))))
  {
    std::cerr << "Error: cannot read file " << input_file << std::endl;
    return EXIT_FAILURE;
  }
  else
    std::cout << " Done. " << points.size() << " points. Time: " << t.time() << " sec." << std::endl;


  std::cout << "Generating candidate faces...";
  t.reset();

  Polygonal_surface_reconstruction algo(
    points,
    Point_map(),
    Normal_map(),
    Plane_index_map()
  );

  std::cout << " Done. Time: " << t.time() << " sec." << std::endl;


  // Reconstruction with complexity control

  // Model 1: more detail
  Surface_mesh model;

  std::cout << "Reconstructing with complexity 0.05...";
  t.reset();
  if (!algo.reconstruct<MIP_Solver>(model, 0.8, 0.15, 0.05)) {
    std::cerr << " Failed: " << algo.error_message() << std::endl;
    return EXIT_FAILURE;
  }
  else {
       const std::string& output_file = "data/building_result-0.05.off";
       if (CGAL::IO::write_OFF(output_file, model)) {
           std::cout << " Done. Saved to " << output_file << ". Time: " << t.time() << " sec." << std::endl;
       }
       else {
           std::cerr << " Failed saving file." << std::endl;
           return EXIT_FAILURE;
       }
  }

  // Model 2: a little less detail
  std::cout << "Reconstructing with complexity 0.5...";
  t.reset();
  if (!algo.reconstruct<MIP_Solver>(model, 0.3, 0.2, 0.5)) {
    std::cerr << " Failed: " << algo.error_message() << std::endl;
    return EXIT_FAILURE;
  }
  else {
       const std::string& output_file = "data/building_result-0.5.off";
       if (CGAL::IO::write_OFF(output_file, model))
           std::cout << " Done. Saved to " << output_file << ". Time: " << t.time() << " sec." << std::endl;
       else {
           std::cerr << " Failed saving file." << std::endl;
           return EXIT_FAILURE;
       }
  }

  // Model 3: more less detail
  std::cout << "Reconstructing with complexity 0.7...";
  t.reset();
  if (!algo.reconstruct<MIP_Solver>(model, 0.2, 0.1, 0.7)) {
    std::cerr << " Failed: " << algo.error_message() << std::endl;
    return EXIT_FAILURE;
  }
  else {
    const std::string& output_file = "data/building_result-0.7.off";
    if (CGAL::IO::write_OFF(output_file, model)){
      std::cout << " Done. Saved to " << output_file << ". Time: " << t.time() << " sec." << std::endl;
                }
    else {
      std::cerr << " Failed saving file." << std::endl;
      return EXIT_FAILURE;
    }
  }
  return EXIT_SUCCESS;
}


#else

int main(int, char**)
{
    std::cerr << "This test requires either GLPK or SCIP.\n";
    return EXIT_SUCCESS;
}

#endif  // defined(CGAL_USE_GLPK) || defined(CGAL_USE_SCIP)