1 #include <iostream>
2 #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
3 #include <CGAL/point_generators_3.h>
4 #include <CGAL/Random.h>
5
6 typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
7 typedef K::Point_3 Point_3;
8 typedef K::Triangle_3 Triangle_3;
9 typedef K::Tetrahedron_3 Tetrahedron_3;
10 typedef CGAL::Random_points_in_triangle_3<Point_3> Point_generator_i;
11 typedef CGAL::Random_points_in_tetrahedron_3<Point_3> Point_generator_ii;
12
main()13 int main() {
14 std::cout << "This example does two things:" << std::endl;
15 std::cout << " (i) it creates 100 random points in a triangle in 3D; and" << std::endl;
16 std::cout << " (ii) it creates 100 random points in a tetrahedron in 3D." << std::endl;
17
18 // The input triangle is as follows
19 Triangle_3 tri(Point_3(0,0,0),Point_3(1,0,0),Point_3(0,1,0));
20 Tetrahedron_3 tet(Point_3(0,0,0),Point_3(1,0,0),Point_3(0,1,0),Point_3(0,0,1));
21
22 // we get output points in these containers
23 std::vector<Point_3> points_in_tri, points_in_tet;
24
25 // creating the first generator, input is the Triangle_3 tri
26 Point_generator_i g_i(tri);
27
28 // creating the second generator, input is the Tetrahedron_3 tet
29 Point_generator_ii g_ii(tet);
30
31 // get 100 random points in tri
32 std::copy_n(g_i, 100, std::back_inserter(points_in_tri));
33
34 // get 100 random points in tet
35 std::copy_n(g_ii, 100, std::back_inserter(points_in_tet));
36
37 // Check that we have really created 100 points.
38 assert( points_in_tri.size() == 100);
39
40 // Check that we have really created 100 points.
41 assert( points_in_tet.size() == 100);
42
43 // print the first points
44 std::cout << "In triangle: " << points_in_tri[0] << std::endl;
45 std::cout << "In tetrahedron: " << points_in_tet[0] << std::endl;
46
47 return 0;
48 }
49
50