CGAL 6.2 - Fast Intersection and Distance Computation (AABB Tree)

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AABB_tree/AABB_triangle_3_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_3.h>
#include <CGAL/AABB_triangle_primitive_3.h>
typedef CGAL::Simple_cartesian<double> K;
typedef K::FT FT;
typedef K::Ray_3 Ray;
typedef K::Point_3 Point;
typedef K::Triangle_3 Triangle;
typedef std::list<Triangle>::const_iterator Iterator;
typedef CGAL::AABB_triangle_primitive_3<K, Iterator> Primitive;
typedef CGAL::AABB_traits_3<K, Primitive> AABB_triangle_traits;
typedef CGAL::AABB_tree<AABB_triangle_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<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, 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;
}
CGAL::AABB_traits_3
This traits class handles any type of 3D geometric primitives provided that the proper intersection t...
Definition: AABB_traits_3.h:514
CGAL::AABB_tree
Static data structure for efficient intersection and distance computations in 2D and 3D.
Definition: AABB_tree.h:57
CGAL::AABB_triangle_primitive_3
Primitive type that uses as identifier an iterator with a 3D triangle as value_type.
Definition: AABB_triangle_primitive_3.h:86
Iterator
CGAL::Simple_cartesian