Periodic_3_triangulation_3/large_point_set.cpp

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Periodic_3_Delaunay_triangulation_traits_3.h>
#include <CGAL/Periodic_3_Delaunay_triangulation_3.h>

#include <CGAL/Random.h>
#include <CGAL/point_generators_3.h>
#include <CGAL/Timer.h>

#include <iostream>
#include <vector>

typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Periodic_3_Delaunay_triangulation_traits_3<K> GT;

typedef CGAL::Periodic_3_Delaunay_triangulation_3<GT> PDT;

typedef PDT::Point          Point;

int main()
{
  CGAL::Timer t;
  typedef CGAL::Creator_uniform_3<double, Point> Creator;
  CGAL::Random random(7);
  CGAL::Random_points_in_cube_3<Point, Creator> in_cube(.5, random);

  int n = 10000;
  std::vector<Point> pts;

  PDT PT1, PT2, PT3;

  // Generating n random points
  for (int i=0 ; i < n ; i++) {
    Point p = *in_cube;
    in_cube++;
    pts.push_back(Point(p.x()+.5,p.y()+.5,p.z()+.5));
  }

  // Standard insertion
  t.start();
  for (int i=0 ; i < n ; i++) {
    PT1.insert(pts[i]);
  }
  t.stop();
  std::cout<<"  Time: "<<t.time()<<" sec. (Standard insertion)"<<std::endl;
  t.reset();

  // Iterator range insertion using spatial sorting but no dummy points
  t.start();
  PT2.insert(pts.begin(), pts.end()); // third parameter defaults to false
  t.stop();
  std::cout<<"  Time: "<<t.time()<<" sec. (with spatial sorting)"<<std::endl;
  t.reset();

  // Iterator range insertion using spatial sorting and dummy point heuristic
  t.start();
  PT3.insert(pts.begin(), pts.end(), true);
  t.stop();
  std::cout<<"  Time: "<<t.time()<<" sec. (Dummy point heuristic)"<<std::endl;

  return 0;
}