CGAL users discussion list

["t.doehring" <>]

Hi Marek,

I'm not an expert on polyhedral surface meshing, but i'm well versed in volumetric meshing with CGAL and meshing in general.

Looking at your model and mesh, I don't think you will be able to reduce mesh density very much using tets in CGAL.

You basically have single element thickness already. Tet meshing of thin shells is a challenging problem. Also, depending on your application, tet shells are really lousy for FE analysis due to the 'locking' problem. 

You need to use a 'non-locking' tet element, I think that Abaqus has one.

As far as I know, CGAL places high priority on edge/surface tolerance. In the volumetric mesher, this is a parameter that you can adjust. Reducing the tolerance allows coarser meshes. I don't know how or if you can do this with the polyhedral mesher. It kind of doesn't make sense to inaccurately mesh a polyhedral surface... kind of defeats the purpose especially in your case where you have pretty strict boundary requirements.

Hope that helps.

===================================================================

Todd Doehring, Ph.D.

Research Assistant Professor

School of Biomedical Engineering, Science, and Health Systems

Drexel University

and CEO: Tensor Biotechnologies LLC (Tensortek.com)

On Thu, May 16, 2013 at 7:06 AM, Marek <> wrote:

Well, I think you are talking about different thing:
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Surface_reconstruction_points_3/Chapter_main.html
I already have shell object and I'm creating 3D mesh from it (as topic
says):
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Mesh_3/Chapter_main.html

I still need help with reducing mesh density. Another example. This:
connections_beam.off
<http://cgal-discuss.949826.n4.nabble.com/file/n4657462/connections_beam.off>
<http://cgal-discuss.949826.n4.nabble.com/file/n4657462/beam_in.png>
is turn into this:
<http://cgal-discuss.949826.n4.nabble.com/file/n4657462/beam.png>
<http://cgal-discuss.949826.n4.nabble.com/file/n4657462/beam2.png>
I need to reduce density. Please, help.

Regards
Marek




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