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<div class="moz-cite-prefix">Hi,<br>
<br>
FYI - you can remove double vertices/edges (or repair) in mesh in
FreeCad (for exampe).<br>
<br>
regards<br>
Roman<br>
<br>
<br>
<br>
W dniu 12.03.2014 10:17, Steffen Becker pisze:<br>
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<div class="moz-cite-prefix">Hi Matthias & Roman,<br>
<br>
I create a nodes- and elements-list like this:<br>
# nodes:<br>
N1 0,0,0<br>
N2 0,1,0<br>
N3 1,0,0<br>
N4 0,0,1<br>
# elements, which describe triangles:<br>
E1 1,2,3<br>
E2 2,3,4<br>
<br>
So I do have double edges (here: between node 2+3). Didn't now
that this is a problem for gmsh, sorry.<br>
<br>
I will try Romans solution asap and give you a feedback.<br>
Thank you both!<br>
<br>
Steffen<br>
<br>
<br>
Am 12.03.2014 09:59, schrieb Zenker, Dr. Matthias:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi
Steffen,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">I am not totally sure from what you wrote
that there are really no duplicated nodes. In gmsh, you
need to define the surfaces in a way that neighbouring
surfaces/facets with a common border use the _<i>same</i>_
nodes to define the border. I could not see from your file
if there are duplicated nodes, and would propose that you
make sure that there are really no such duplications.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">If the meshing still fails, then this is a
question for the real gurus (Christophe?).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">HTH,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Matthias<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div style="border:none;border-left:solid blue
1.5pt;padding:0cm 0cm 0cm 4.0pt">
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1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"
lang="EN-US">Von:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"
lang="EN-US"> Roman Fratczak [<a
moz-do-not-send="true"
class="moz-txt-link-freetext"
href="mailto:fratczakroman@o2.pl">mailto:fratczakroman@o2.pl</a>]
<br>
</span><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">Gesendet:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
Mittwoch, 12. März 2014 09:51<br>
<b>An:</b> Steffen Becker<br>
<b>Cc:</b> <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><br>
<b>Betreff:</b> Re: [Gmsh] Error : Self intersecting
surface mesh, computing intersections (this could
take a while)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Hi Steffen,<br>
<br>
No it is more clear. If you are working with cloud of
point, then you may use Meshlab for surface
regeneration. There are many software that are able to
handle in a resonable way the cloud of points (like
rhino3D + resurf, other). But these are rather
commercial.<br>
<br>
From the other side - try to do the simplest thing:<br>
<br>
Adjust your python script for surface creation in order
to save not as PLY but as GMSH "geo" file using points
and lines<br>
<br>
Point(1)={0,0,0} ;<br>
Point(2)={0,1,0} ;<br>
...<br>
<br>
Line(1) = {1,2};<br>
..<br>
and.. Line Loop & Surface -> Volume ..<br>
<br>
Then you will get a volume defined by geometric
entities. In this case is shoul be easier to create a
better mesh on surface and then on whole volume.<br>
<br>
Regards<br>
Roman<br>
<br>
<br>
<br>
W dniu 11.03.2014 17:59, Steffen Becker pisze:<o:p></o:p></p>
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<p class="MsoNormal">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>
<br>
<o:p></o:p></p>
<pre>Hi Steffen,<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>I don't see either why the meshing fails, sorry.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Matthias<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>-----Ursprüngliche Nachricht-----<o:p></o:p></pre>
<pre>Von: Steffen Becker [<a moz-do-not-send="true" href="mailto:steffenbecker87@yahoo.de">mailto:steffenbecker87@yahoo.de</a>]<o:p></o:p></pre>
<pre>Gesendet: Dienstag, 11. März 2014 14:42<o:p></o:p></pre>
<pre>An: Zenker, Dr. Matthias<o:p></o:p></pre>
<pre>Cc: <a moz-do-not-send="true" href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><o:p></o:p></pre>
<pre>Betreff: Re: [Gmsh] Error : Self intersecting surface mesh, computing<o:p></o:p></pre>
<pre>intersections (this could take a while)<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Oh I'm really sorry, here is the file.<o:p></o:p></pre>
<pre>In addition I sent you also the intersect.pos. I don't understand why exactly<o:p></o:p></pre>
<pre>these surfaces are problematic and the "neighbour surfaces"<o:p></o:p></pre>
<pre>aren't - although they have the same geometry =/<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Am 11.03.2014 12:07, schrieb Zenker, Dr. Matthias:<o:p></o:p></pre>
<pre>Hi Steffen,<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>if you don't provide the myfile.ply2, we cannot see your geometry...<o:p></o:p></pre>
<pre> You can visualize intersect.pos by merging it to your geometry.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>HTH,<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Matthias<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<p class="MsoNormal">Am 11.03.2014 14:33, schrieb Roman
Fratczak:<o:p></o:p></p>
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<div>
<p class="MsoNormal">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:<o:p></o:p></p>
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<div>
<p class="MsoNormal">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:<o:p></o:p></p>
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style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">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:<o:p></o:p></p>
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style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">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:<o:p></o:p></p>
</div>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">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:<o:p></o:p></p>
</div>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">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>
<br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
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<br>
<br>
<br>
<o:p></o:p></p>
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<br>
<br>
<br>
<o:p></o:p></p>
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