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<div class="moz-cite-prefix">Hi,<br>
<br>
@ Roman:<br>
some more details:<br>
I have a point cloud given and generate the surface mesh by myself
(with python). I don't know a good algorithm to create a volume
mesh out of this surface mesh - that's why I use gmsh for this
task.<br>
I also checked my surface mesh for double vertexes but I didn't
find any. What do you mean with "double egdes"? Isn't there always
a "double edge", because two neighbour facets always have one same
edge?!<br>
<br>
I will send you a .step or .iges file as soon as I figured out how
to handle the "No OpenCASCADE model found" error.<br>
<br>
I'm appending the other mailing history (with Matthias) to this
mail - sorry for that "double mailing", I just forgot one time to
"reply to all" -.-<br>
Anyone else has an idea why the meshing fails?<br>
<br>
Regards and thank you a lot,<br>
Steffen<br>
<br>
<br>
<pre wrap="">Hi Steffen,
I don't see either why the meshing fails, sorry.
Matthias
</pre>
<pre wrap="">-----Ursprüngliche Nachricht-----
Von: Steffen Becker [<a class="moz-txt-link-freetext" href="mailto:steffenbecker87@yahoo.de">mailto:steffenbecker87@yahoo.de</a>]
Gesendet: Dienstag, 11. März 2014 14:42
An: Zenker, Dr. Matthias
Cc: <a class="moz-txt-link-abbreviated" href="mailto:gmsh@geuz.org">gmsh@geuz.org</a>
Betreff: Re: [Gmsh] Error : Self intersecting surface mesh, computing
intersections (this could take a while)
Oh I'm really sorry, here is the file.
In addition I sent you also the intersect.pos. I don't understand why exactly
these surfaces are problematic and the "neighbour surfaces"
aren't - although they have the same geometry =/
Am 11.03.2014 12:07, schrieb Zenker, Dr. Matthias:
</pre>
<pre wrap="">Hi Steffen,
if you don't provide the myfile.ply2, we cannot see your geometry...
<span class="moz-smiley-s3" title=";)"></span> You can visualize intersect.pos by merging it to your geometry.
HTH,
Matthias
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Am 11.03.2014 14:33, schrieb Roman Fratczak:<br>
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<div class="moz-cite-prefix">Hello,<br>
<br>
It is possible, that you will get your geometry in other format?
<br>
In your "ply" there is already a surface mesh given. Try maybe
use STEP, IGES,... as input- then it is easer to recalculate
the surface mesh.<br>
<br>
In case of need of usage of "a dead mesh" - maybe try first to
remesh it (i.e. in blender with modification Remesh) and/or
clean it (removing double vertexes and edges).<br>
<br>
regards<br>
Roman<br>
<br>
<br>
<br>
<br>
W dniu 11.03.2014 12:13, Steffen Becker pisze:<br>
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<div class="moz-cite-prefix">Hi,<br>
<br>
in the appendix you find my model.<br>
Thanks for help!!<br>
<br>
Regards,<br>
Steffen<br>
<br>
Am 11.03.2014 11:47, schrieb Roman Fratczak:<br>
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<div class="moz-cite-prefix">Hello Steffen,<br>
<br>
Yes. You can try to the first Optimize quality of tetra, or
all of them (just try).<br>
<br>
I don't know how your model looks like. If the elements on
the surface are too big, then the solid elements (probably
tetragonal) may be with intersecting edges or faces.
Therefore the reducing size of element may help (especially
on the surfaces).<br>
<br>
Or- just share your model (ply) -in order to be more
precise.<br>
<br>
regards<br>
Roman<br>
<br>
<br>
<br>
W dniu 10.03.2014 18:06, Steffen Becker pisze:<br>
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<div class="moz-cite-prefix">Hi Roman,<br>
when you say "enable option: optimize", you mean" Tools
-> Options -> Mesh -> Advanced -> Optimize
quality of tetrahedra, Optimize quality of tetrahedra with
Netgen, Optimize high order meshes (experimental)" ?<br>
And why is reducing element size important? In my case it
is important that the object has such "90 degree corners".<br>
<br>
Regards,<br>
Steffen<br>
<br>
Am 10.03.2014 16:55, schrieb Roman Fratczak:<br>
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<div class="moz-cite-prefix">Hi Steffen,<br>
<br>
If your volume is OK (is really a closed one) - try to:<br>
<br>
1. Reduce element size (especially in a curved shapes)<br>
2. Enable option "Optimize" - in mesh options <br>
<br>
Regards<br>
Roman<br>
<br>
<br>
<br>
W dniu 10.03.2014 16:41, Steffen Becker pisze:<br>
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<blockquote cite="mid:531DDD38.6010807@yahoo.de"
type="cite">Hello everyone, <br>
<br>
I'm a gmsh beginner and I want to create a 3D volume
mesh out of a given surface-mesh but I got the error
message as seen in the subject. You find my .geo file in
the appendix. <br>
Can anyone tell me what I have to do to create a 3D
mesh? I even can't figure out where the intersection are
located (don't know how to read the intersect.pos). <br>
Sorry for my poor english. <br>
<br>
Regards, <br>
Steffen <br>
<br>
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