translate_vpm.cpp

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polygon_mesh_processing/bbox.h>
#include <CGAL/boost/graph/helpers.h>
#include <CGAL/Surface_mesh.h>

typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Surface_mesh<K::Point_3> SM;


template <class Point, class Vector>
struct Translate_point_map
{
  typedef Point value_type;
  typedef Point reference;
  typedef boost::readable_property_map_tag category;
  typedef typename CGAL::Surface_mesh<Point>::Vertex_index key_type;

  Translate_point_map(const CGAL::Surface_mesh<Point>& sm,
                      const Vector& v)
    : sm(sm)
    , v(v)
  {}

  friend value_type get(const Translate_point_map& m, key_type k)
  {
    return m.sm.point(k) + m.v; 
  }

  const CGAL::Surface_mesh<Point>& sm;
  Vector v;
};

int main()
{
  // create a tetrahedron mesh
  SM sm;
  CGAL::make_tetrahedron(K::Point_3(0,0,0),
                         K::Point_3(0,1,0),
                         K::Point_3(1,0,0),
                         K::Point_3(1,1,0),
                         sm);

  CGAL::Bbox_3 bbox1 = CGAL::Polygon_mesh_processing::bbox(sm);// using the default point map

  Translate_point_map<K::Point_3, K::Vector_3> vpm(sm, K::Vector_3(1,1,1));

  CGAL::Bbox_3 bbox2  = CGAL::Polygon_mesh_processing::bbox(sm,
                          CGAL::parameters::vertex_point_map(vpm));// using the default point map

  return 0;
}