Scale_space_reconstruction_3/scale_space_manifold.cpp

#include <fstream>
#include <iostream>

#include <CGAL/Scale_space_surface_reconstruction_3.h>

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>

#include <CGAL/IO/read_off_points.h>
#include <CGAL/Timer.h>

typedef CGAL::Exact_predicates_inexact_constructions_kernel     Kernel;

typedef CGAL::Scale_space_surface_reconstruction_3< Kernel >                Reconstruction;
typedef CGAL::Scale_space_reconstruction_3::Weighted_PCA_smoother< Kernel > Smoother;
typedef CGAL::Scale_space_reconstruction_3::Alpha_shape_mesher< Kernel >    Mesher;

typedef Reconstruction::Point                                   Point;

typedef Reconstruction::Facet_const_iterator                    Facet_iterator;
typedef Mesher::Facet_const_iterator                            Mesher_iterator;
typedef CGAL::Timer Timer;

int main(int argc, char* argv[]) {
  if (argc!=2){
    std::cerr << "Error, no input file provided\n";
    return 1;
  }
  // Read the data.
  std::vector<Point> points;
  std::ifstream in(argv[1]);
  std::cerr << "Reading " << std::flush;
  if( !in || !CGAL::read_off_points( in, std::back_inserter( points ) ) ) {
    std::cerr << "Error: cannot read file" << std::endl;
    return EXIT_FAILURE;
  }
  std::cerr << "done: " << points.size() << " points." << std::endl;

  Timer t;
  t.start();
  // Construct the mesh in a scale space.
  Reconstruction reconstruct( points.begin(), points.end() );
  Smoother smoother( 10, 200 );
  reconstruct.increase_scale (4, smoother);

  Mesher mesher( smoother.squared_radius(),
                 false, // Do not separate shells
                 true // Force manifold output
               );                 
  reconstruct.reconstruct_surface( mesher );
  
  std::cerr << "Reconstruction done in " << t.time() << " sec." << std::endl;
  t.reset();
  std::ofstream out ("out.off");
  // Write the reconstruction.
  for( Facet_iterator it = reconstruct.facets_begin( ); it != reconstruct.facets_end(  ); ++it )
    out << "3 "<< *it << '\n'; // We write a '3' in front so that it can be assembled into an OFF file

  std::cerr << "Writing result in " << t.time() << " sec." << std::endl;

  out.close();

  t.reset();
  std::ofstream garbage ("garbage.off");
  // Write facets that were removed to force manifold output
  for( Mesher_iterator it = mesher.garbage_begin( ); it != mesher.garbage_end(  ); ++it )
    garbage << "3 "<< *it << '\n'; // We write a '3' in front so that it can be assembled into an OFF file
  std::cerr << "Writing garbage facets in " << t.time() << " sec." << std::endl;

  garbage.close ();

  std::cerr << "Done." << std::endl;
  return EXIT_SUCCESS;
}