Thanks Matthias,
I'll do as you say.
Best,
Mario
On 08/20/2013 11:57 AM, Zenker, Dr. Matthias wrote:
Hi,
the problem is indeed that the solids have touching surfaces. If the geometry
is defined with gmsh, you can use the same surface as outer surface for more
than one solid. This would avoid the problem, but AFAIK in CAD this is not
possible.
Maybe you could just define(uniquely) the outer faces in your CAD (without the
solids), merge them into a geo file and define the solids with gmsh.
As I wrote, gmsh cannot (yet?) "heal" this kind of problems by identifying and
merging the duplicate surfaces. If I have a problematic geometry, I save it as geo file
and remove the duplicated surfaces by hand, waiting for a better solution...
Matthias
-----Ursprüngliche Nachricht-----
Von: Mario Ceresa [mailto:[email protected]]
Gesendet: Dienstag, 20. August 2013 11:22
An: Zenker, Dr. Matthias
Cc: [email protected]
Betreff: Re: AW: [Gmsh] Some hints to solve self intersecting surface errors?
Hi Matthias,
thanks for your mail. I tried to remove the smaller cilinder and indeed cut and
merge does modify the geo, albeit in a strange way (there are volumes made
of only one surface). It still segfault during 2d meshing.
Meshing joint2.igs *without* cut-and-merge still complains about self-
intersecting faces.
I attach the iges model and the geo file saved after the import and the
automatic cut and merge.
I wonder if the problem is that i create three separate solids which have
touching surfaces. Maybe I'm not supposed to do so? If this is the case,
which is the right way?
Thanks and regards,
Mario
On 08/19/2013 04:09 PM, Zenker, Dr. Matthias wrote:
Hi,
this is a known problem, and there exists no proper solution within gmsh
(yet?).
To see the problematic faces, you can merge the intersect.pos file gmsh
generates. Then you can try to resolve the problematic faces directly in your
CAD or by saving your input file in geo format and modifying that one.
IF your case is not much more complicated than your testcase, it might
suffice to resolve the partial overlap between the outer surfaces of the small
and the large cylinder. If you omit the small cylinder (volume 3 in gmsh) for
testing, does "cut and merge faces" work between the others?
HTH,
Matthias
-----Ursprüngliche Nachricht-----
Von: Mario Ceresa [mailto:[email protected]]
Gesendet: Montag, 19. August 2013 10:14
An: [email protected]
Betreff: [Gmsh] Some hints to solve self intersecting surface errors?
Dear all,
My workflow is to use Sketchup to quickly create the geometry, export
it as iges and then mesh it with gmsh. Sometimes, usually when I have
many co- planar faces, I get the error:
"Self intersecting surface mesh, computing intersections"
and meshing fails. I attach an example. I tried "Cut-and-merge-faces"
option but it segfaults during 2d meshing.
Which is the proper way to solve this? Is there a way to "see" the
problematic faces so to know which parts of the geometry to change?
Thanks and regards,
Mario
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_____________________________________________________________________
ERBE Elektromedizin GmbH
Firmensitz: 72072 Tuebingen
Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede
Registergericht: Stuttgart HRB 380137
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