CGAL 6.1.2 - 3D Polyhedral Surface

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Polyhedron/polyhedron_prog_normals.cpp
#include <CGAL/Homogeneous.h>
#include <CGAL/Polyhedron_traits_with_normals_3.h>
#include <CGAL/Polyhedron_3.h>
#include <iostream>
#include <algorithm>
struct Normal_vector {
template <class Facet>
typename Facet::Plane_3 operator()( Facet& f) {
typename Facet::Halfedge_handle h = f.halfedge();
// Facet::Plane_3 is the normal vector type. We assume the
// CGAL Kernel here and use its global functions.
return CGAL::cross_product(
h->next()->vertex()->point() - h->vertex()->point(),
h->next()->next()->vertex()->point() - h->next()->vertex()->point());
}
};
typedef CGAL::Homogeneous<int> Kernel;
typedef Kernel::Point_3 Point_3;
typedef Kernel::Vector_3 Vector_3;
typedef CGAL::Polyhedron_traits_with_normals_3<Kernel> Traits;
typedef CGAL::Polyhedron_3<Traits> Polyhedron;
int main() {
Point_3 p( 1, 0, 0);
Point_3 q( 0, 1, 0);
Point_3 r( 0, 0, 1);
Point_3 s( 0, 0, 0);
Polyhedron P;
P.make_tetrahedron( p, q, r, s);
std::transform( P.facets_begin(), P.facets_end(), P.planes_begin(),
Normal_vector());
CGAL::IO::set_pretty_mode( std::cout);
std::copy( P.planes_begin(), P.planes_end(),
std::ostream_iterator<Vector_3>( std::cout, "\n"));
return 0;
}
CGAL::Polyhedron_3
A polyhedral surface Polyhedron_3 consists of vertices V, edges E, facets F and an incidence relation...
Definition: Polyhedron_3.h:113
CGAL::Polyhedron_traits_with_normals_3
The class Polyhedron_traits_with_normals_3 is a model of the PolyhedronTraits_3 concept.
Definition: Polyhedron_traits_with_normals_3.h:30
Kernel::Point_3
Kernel::Vector_3
CGAL::IO::set_pretty_mode
Mode set_pretty_mode(std::ios &s)
CGAL::cross_product
CGAL::Vector_3< Kernel > cross_product(const CGAL::Vector_3< Kernel > &u, const CGAL::Vector_3< Kernel > &v)
Kernel
CGAL::Homogeneous