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[Ramin H <>]

I really appreciate your comments.

Thank you,
-Ramin

On Thu, May 6, 2010 at 4:33 AM, Stephane Tayeb <> wrote:

Hi Ramin,

Let me just add that I get the same results as you on my computer. As Mariette says, it just mean that the mesh resolution is not sufficient to obtain a tetrahedralization of the volume between two very close input faces (they are seen as one single input face).

Something that you can probably do is to remove the faces which are incident to the same subdomain from the c3t3.

Best regards,
Stéphane.


Mariette Yvinec wrote:

We add some discussions here about that.
In fact, what happens in  the meshing  of polyhedral_domain
is the following:
- when you asked if a facet is on the surface, you actually
test if there is any intersection between the dual segment of this facet
and the input polyhedral surface
- when you compare the sub_domain index of  the two cells incident
 to a given facet, you  get the same index if the dual segment
od the facets intersects twice (or any even number of time)
the boundary surface of this subdomain.

This explain while the first test can tell that a facet is on the surface
while its two incident cells belong to the same subdomain.
Such a behavior especially happens when the input polyhedral surfaces has very close
faces that the mesher has not  resolved in its actual  state of refinement.
In particular, in the case in the model
elephant.off, this may happens
because the input triangulated surface of this model
is self intersecting.

I hope this helps,
Mariette

Ramin H wrote:

Recently most of my questions get ignored before a resolution is found. Are my questions irrelevant?

On Wed, May 5, 2010 at 10:16 AM, Ramin H < <mailto:>> wrote:

   I am attaching a slightly modified version of
   mesh_polyhedral_domain.cpp  and input.off (the elephant that comes
   with the CGAL examples).

   Can you please compile and the .cpp file and run it against the
   input.off and see if you get any output such as:
   Cell and it's mirror have equal subdomain_index: 0

   If yes, then why do you think this is happening? How can we fix this?

   Thank you for your time.
   -Ramin

--
Stephane Tayeb
Software engineer - INRIA Sophia Antipolis
Geometrica Project-Team

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