CGAL users discussion list

[Sascha Zelzer <>]

Hi,

I was finally able to construct a suitable set of seed points and run the mesh generation step successfully.

Many thanks for your hints!

Before my first posting to this list, I have tried using a CGAL::SizingField and setting different values for the tet radii for the different sub-domains. That did obviously not work out and I now know it is because of an inappropriate default seed point set.

Thanks,

Sascha

On 09/10/2012 09:57 AM, Mariette Yvinec wrote:

Currently,
the best way to ensure that small component are mot missed
is to set initial points in them or on them boundary.
Then you have to use refine_mesh_3 instead of
make_mesh_3 for your initaial seeding points to be taken into account.

Another way, if you know the area where the small components are supposed to be,
is to define a  variable sizing field with a value locally similar to the size of the components
to be meshed.

Le 30/08/12 16:18, Sascha Zelzer a écrit :

Hi,

I have posted about my problem already here http://cgal-discuss.949826.n4.nabble.com/3D-volume-mesher-ignoring-small-subdomains-td4655756.html but thought I reformulate it:

I have a labeled image as input to make_mesh_3 which contains a small sub-domain (label 2) inside a larger domain (label 1). Small meaning the its characteristic size is about two orders of magnitude smaller then the embedding domain.

So my question is, what are the criteria for refining cells in the large domain to ensure that they do not "shadow" a complete small sub-domain? I would like to be able to set a large maximum cell size for the large domain and a suitable cell size for small sub-domain. When setting the cell and facet criteria in such a way, my small sub-domain is ignored however.

Any tips would be highly appreciated.

Thanks,

Sascha

-- 
Mariette Yvinec
Geometrica project team
INRIA  Sophia-Antipolis