AABB_tree/AABB_segment_3_example.cpp

// Author : Pierre Alliez
 
#include <iostream>
#include <list>
 
#include <CGAL/Simple_cartesian.h>
#include <CGAL/AABB_tree.h>
#include <CGAL/AABB_traits_3.h>
#include <CGAL/AABB_segment_primitive_3.h>
 
typedef CGAL::Simple_cartesian<double> K;
 
typedef K::FT FT;
typedef K::Point_3 Point;
typedef K::Plane_3 Plane;
typedef K::Segment_3 Segment;
typedef K::Triangle_3 Triangle;
 
typedef std::list<Segment>::iterator Iterator;
typedef CGAL::AABB_segment_primitive_3<K, Iterator> Primitive;
typedef CGAL::AABB_traits_3<K, Primitive> Traits;
typedef CGAL::AABB_tree<Traits> Tree;
 
int main()
{
    Point a(1.0, 0.0, 0.0);
    Point b(0.0, 1.0, 0.0);
    Point c(0.0, 0.0, 1.0);
    Point d(0.0, 0.0, 0.0);
 
    std::list<Segment> segments;
    segments.push_back(Segment(a,b));
    segments.push_back(Segment(a,c));
    segments.push_back(Segment(c,d));
 
    // constructs the AABB tree and the internal search tree for
    // efficient distance computations.
    Tree tree(segments.begin(),segments.end());
 
    // counts #intersections with a plane query
    Plane plane_query(a,b,d);
    std::cout << tree.number_of_intersected_primitives(plane_query)
        << " intersections(s) with plane" << std::endl;
 
    // counts #intersections with a triangle query
    Triangle triangle_query(a,b,c);
    std::cout << tree.number_of_intersected_primitives(triangle_query)
        << " intersections(s) with triangle" << std::endl;
 
    // computes the closest point from a point query
    Point point_query(2.0, 2.0, 2.0);
    Point closest = tree.closest_point(point_query);
 
    std::cerr << "closest point is: " << closest << std::endl;
    return EXIT_SUCCESS;
}