AABB_tree/AABB_triangle_2_example.cpp

// Author(s) : Camille Wormser, Pierre Alliez
 
#include <iostream>
#include <list>
 
#include <CGAL/Simple_cartesian.h>
#include <CGAL/AABB_tree.h>
#include <CGAL/AABB_traits_2.h>
#include <CGAL/AABB_triangle_primitive_2.h>
 
typedef CGAL::Simple_cartesian<double> K;
 
typedef K::FT FT;
typedef K::Ray_2 Ray;
typedef K::Point_2 Point;
typedef K::Triangle_2 Triangle;
 
typedef std::list<Triangle>::iterator Iterator;
typedef CGAL::AABB_triangle_primitive_2<K, Iterator> Primitive;
typedef CGAL::AABB_traits_2<K, Primitive> AABB_triangle_traits;
typedef CGAL::AABB_tree<AABB_triangle_traits> Tree;
 
int main()
{
    Point a(1.0, 0.0);
    Point b(0.0, 1.0);
    Point c(1.0, 1.0);
    Point d(0.0, 0.0);
 
    std::list<Triangle> triangles;
    triangles.push_back(Triangle(a,b,c));
    triangles.push_back(Triangle(a,b,d));
    triangles.push_back(Triangle(a,d,c));
 
    // constructs AABB tree
    Tree tree(triangles.begin(),triangles.end());
 
    // counts #intersections
    Ray ray_query(a,b);
    std::cout << tree.number_of_intersected_primitives(ray_query)
        << " intersections(s) with ray query" << std::endl;
 
    // compute closest point and squared distance
    Point point_query(2.0, 2.0);
    Point closest_point = tree.closest_point(point_query);
    std::cerr << "closest point is: " << closest_point << std::endl;
 
    FT sqd = tree.squared_distance(point_query);
    std::cout << "squared distance: " << sqd << std::endl;
 
    return EXIT_SUCCESS;
}