CGAL users discussion list

[Bo Zhou <>]

Christian Walder wrote:

I see, thanks. Can anyone recommend a good c++ implementation of the marching cubes algorithm? I am quite surprised that this is not easier to find...

On Fri, Jul 17, 2009 at 11:09 AM, Mariette Yvinec <> wrote:

CGAL Surface mesher is not a marching cube.
It builds  iteratively a sampling adapted to the surface geometry
so that the restricted triangulation  of this sampling is
an accurate approximation of the surface and a nice
surface mesh formed with well shaped triangles.

Christian Walder wrote:

Dear All,

I have used the CGAL library to perform marching cubes on an implicit surface. Unfortunately it is extremely slow - previously I have used a different implementation from an unknown author, and it is orders of magnitude faster for roughly the same resolution. I am wondering if I have called the functions correctly, and whether there are any easy ways attempt to speed it up.

Best Regards,

Christian

ps.

The key snippet of code is the following:

 Tr tr;            // 3D-Delaunay triangulation                                                            C2t3 c2t3 (tr);   // 2D-complex in 3D-Delaunay triangulation                                              Surface_3 surface(implicit_function, Sphere_3(Point_3(center[0],center[1],center[2]), radius));
 // defining meshing criteria                                                                            
 CGAL::Surface_mesh_default_criteria_3<Tr> criteria(30.,  // angular bound                                                                                   radius_bound,  // radius bound                                                                           distance_bound); // distance bound                    CGAL::make_surface_mesh(c2t3, surface, criteria, CGAL::Non_manifold_tag());
 

--
Mariette Yvinec
Geometrica project team
INRIA  Sophia-Antipolis  


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