CGAL users discussion list

[Clément Jamin <>]

On Mon, Apr 8, 2013 at 6:04 PM, David Bernstein
<>
 wrote:
> Mariette Yvinec wrote
>> Hi Dave
>>
>> It is not currently possible to use the implicit surface mesher
>> if you have sharp features.
>>   However you can use for that the  tetrahedral mesher.
>> The 3d mesh generator behaves as the surface mesher
>> when it is launched with trivial criteria
>> for the mesh tetrahedra. Besides it has the advantage
>> to offer the possibility of handling sharp edges.
>>
>> --
>> Mariette Yvinec
>> Geometrica project team
>> INRIA  Sophia-Antipolis
>
> Hi Mariette, Thanks very much for your response.  Can you elaborate on what
> is the "trivial criteria" for tetrahedra?  Is it that they are degenerate,
> or triangles, so that only a surface mesh is created by calling the 3D
> mesher this way?  If so, that would work fine for me.  I would rather not
> have to create a full 3D mesh of tetrahedra and then extract the surface
> mesh (since for the application I have in mind this will most likely be too
> slow).

Hi,

Just don't specify any criteria for the cells, so that they don't get refined.
Then parse the facets of the C3T3 using the iterators
"facets_in_complex_begin" and "facets_in_complex_end", this will give
you the surface triangles

Hope this helps,
Clément Jamin.