CGAL users discussion list

[Edouard rivière <>]

Hi,

 

I try to use CGAL to perform line/mesh intersection, so I began with the examples in the documentation. I compiled the '3D Fast intersection and Distance Computation' (http://doc.cgal.org/latest/AABB_tree/AABB_tree_2AABB_polyhedron_facet_intersection_example_8cpp-example.html) that works fine.

 

Then I tried to retrieve the coordinates of all intersection points obtained after     tree.all_intersections(segment_query, std::back_inserter(intersections));

 

by using this code :

 

for(std::list<Segment_intersection>::iterator it = intersections.begin(); it!=intersections.end(); it++) {

     std::cout << *it << std::endl;

}

 

I get error message 'error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>'

 

Is it possible to get some help at this point ?

 

best regards

 

 

 

// Author(s) : Camille Wormser, Pierre Alliez #include <iostream> #include <list> #include <CGAL/Simple_cartesian.h> #include <CGAL/AABB_tree.h> #include <CGAL/AABB_traits.h> #include <CGAL/Polyhedron_3.h> #include <CGAL/boost/graph/graph_traits_Polyhedron_3.h>

#include <CGAL/AABB_face_graph_triangle_primitive.h>

typedef CGAL::Simple_cartesian<double> K; typedef K::Point_3 Point; typedef K::Plane_3 Plane; typedef K::Vector_3 Vector; typedef K::Segment_3 Segment; typedef K::Ray_3 Ray; typedef CGAL::Polyhedron_3<K> Polyhedron; typedef CGAL::AABB_face_graph_triangle_primitive<Polyhedron> Primitive; typedef CGAL::AABB_traits<K, Primitive> Traits; typedef CGAL::AABB_tree<Traits> Tree; typedef boost::optional< Tree::Intersection_and_primitive_id<Segment>::Type > Segment_intersection; typedef boost::optional< Tree::Intersection_and_primitive_id<Plane>::Type > Plane_intersection; typedef Tree::Primitive_id Primitive_id; int main() {

    Point p(1.0, 0.0, 0.0);

    Point q(0.0, 1.0, 0.0);

    Point r(0.0, 0.0, 1.0);

    Point s(0.0, 0.0, 0.0);

    Polyhedron polyhedron;

    polyhedron.make_tetrahedron(p, q, r, s);

    // constructs AABB tree

    Tree tree(faces(polyhedron).first, faces(polyhedron).second, polyhedron);

    // constructs segment query

    Point a(-0.2, 0.2, -0.2);

    Point b(1.3, 0.2, 1.3);

    Segment segment_query(a,b);

    // tests intersections with segment query

    if(tree.do_intersect(segment_query))

        std::cout << "intersection(s)" << std::endl;

    else

        std::cout << "no intersection" << std::endl;

    // computes #intersections with segment query

    std::cout << tree.number_of_intersected_primitives(segment_query)

        << " intersection(s)" << std::endl;

    // computes first encountered intersection with segment query

    // (generally a point)

    Segment_intersection intersection =

        tree.any_intersection(segment_query);

    if(intersection)

    {

        // gets intersection object

      const Point* p = boost::get<Point>(&(intersection->first));

      if(p)

        std::cout << "intersection object is a point " << *p << std::endl;

    }

    // computes all intersections with segment query (as pairs object - primitive_id)

    std::list<Segment_intersection> intersections;

    tree.all_intersections(segment_query, std::back_inserter(intersections));

 

// show all intersection ???

 

    // computes all intersected primitives with segment query as primitive ids

    std::list<Primitive_id> primitives;

    tree.all_intersected_primitives(segment_query, std::back_inserter(primitives));

    // constructs plane query

    Vector vec(0.0,0.0,1.0);

    Plane plane_query(a,vec);

    // computes first encountered intersection with plane query

    // (generally a segment)

    Plane_intersection plane_intersection = tree.any_intersection(plane_query);

    if(plane_intersection)

    {

 

      if(boost::get<Segment>(&(plane_intersection->first)))

            std::cout << "intersection object is a segment" << std::endl;

    }

 

    return EXIT_SUCCESS;

}