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<div class="moz-cite-prefix">Hi Matthias,<br>
<br>
I think you are talking about your mail from 12.03.2014 09:59 ?<br>
In one of my last mails I already sent you a selfcreated .msh file
- but the 3D mesh still failes. The intersect.pos shows me some
intersections, but when I check my nodes for duplicates I can't
find any.<br>
Hope my steps are correct:<br>
- create "my_file.msh" with my python script and check it for
nodes duplications -> none found<br>
- open "my_file.geo" in Gmsh<br>
- do "Modules" -> "Mesh" -> "3D"<br>
- receive error message<br>
- merge "intersect.pos" and see some intersections but I don't
know why because the are no duplicated nodes<br>
<br>
Steffen<br>
<br>
<br>
Am 14.03.2014 09:50, schrieb Zenker, Dr. Matthias:<br>
</div>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Hi Steffen,<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">you should be able to generate a filled volume
mesh if you follow my suggestion from the other mail:<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">Write the 2D mesh in gmsh format (e.g. as
outerface.msh, gmsh documentation for more info on the msh
format) and merge that one instead of the myfile.ply2 file,
leaving the other command lines in your .geo file as they
are. If you then do a 3D mesh, gmsh will take the 2D mesh as
defined in your file. You can then refine the mesh if you
wish.<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 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">
<div>
<div style="border:none;border-top:solid #B5C4DF
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">Von:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
Steffen Becker [<a class="moz-txt-link-freetext" href="mailto:steffenbecker87@yahoo.de">mailto:steffenbecker87@yahoo.de</a>]
<br>
<b>Gesendet:</b> Mittwoch, 12. März 2014 20:00<br>
<b>An:</b> Roman Fratczak<br>
<b>Cc:</b> Zenker, Dr. Matthias; <a 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>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Hi,<br>
<br>
I'm so sorry for all time you spent with my problem, but
now I see: We talk at cross. It's my fault, I didn't
explained correctly what I need.<br>
I want to receive a *filled* volume mesh.<br>
I created 2 files (steffen.stl and steffen2.stl) with my
python script.<br>
With steffen.stl I successfully could create such a filled
volume mesh as seen in steffen.msh.<br>
When I try exactly the same with steffen2.stl then I get
the error message in the subject (and the surface mesh
doesn't get filled).<br>
So that's why the .iges file you sent me isn't what I
need.<br>
<br>
Sorry for all this confusion,<br>
Steffen<br>
<br>
<br>
Am 12.03.2014 18:53, schrieb Roman Fratczak:<o:p></o:p></p>
</div>
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<div>
<p class="MsoNormal">Steffen,<br>
<br>
I did a volume based on your surface mesh - see attached
IGES (compressed with 7-zip).<br>
After reading it into GMSH, you can create the 1D, then
2D and finally 3D mesh with no errors.<br>
<br>
You can do the same using GMSH volume definition (as
already wrote)-> it will work, as the fundamental
faces are plane triangles.<br>
<br>
Regards<br>
Roman<br>
<br>
<br>
W dniu 12.03.2014 18:27, Steffen Becker pisze:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Wrong .geo file, sorry!<br>
<br>
Am 12.03.2014 18:21, schrieb Steffen Becker:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Thank you so far,<br>
<br>
I create both files: .msh and .geo, but I still get
the same error. What's my mistake?<br>
<br>
Steffen<br>
<br>
Am 12.03.2014 11:48, schrieb Roman Fratczak:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">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:<o:p></o:p></p>
</div>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">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:<o:p></o:p></p>
</div>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi
Steffen,</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></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.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"> </span><o:p></o:p></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?).</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">HTH,</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Matthias</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<div style="border:none;border-left:solid blue
1.5pt;padding:0cm 0cm 0cm 4.0pt">
<div>
<div style="border:none;border-top:solid
#B5C4DF 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"
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"
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)</span><o:p></o:p></p>
</div>
</div>
<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>
</div>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<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>
<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>
</div>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<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>
</div>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<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>
</div>
<blockquote
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>
</div>
<blockquote
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>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>gmsh mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://www.geuz.org/mailman/listinfo/gmsh">http://www.geuz.org/mailman/listinfo/gmsh</a><o:p></o:p></pre>
</blockquote>
<p class="MsoNormal"><br>
<br>
<br>
<br>
<br>
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<pre>_______________________________________________<o:p></o:p></pre>
<pre>gmsh mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://www.geuz.org/mailman/listinfo/gmsh">http://www.geuz.org/mailman/listinfo/gmsh</a><o:p></o:p></pre>
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<pre>_______________________________________________<o:p></o:p></pre>
<pre>gmsh mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://www.geuz.org/mailman/listinfo/gmsh">http://www.geuz.org/mailman/listinfo/gmsh</a><o:p></o:p></pre>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
<br>
_____________________________________________________________________<br>
ERBE Elektromedizin GmbH<br>
Firmensitz: 72072 Tuebingen<br>
Geschaeftsfuehrer: Christian O. Erbe, Reiner
Thede<br>
Registergericht: Stuttgart HRB 380137<o:p></o:p></p>
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<br>
<br>
_____________________________________________________________________<br>
ERBE Elektromedizin GmbH<br>
Firmensitz: 72072 Tuebingen<br>
Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede<br>
Registergericht: Stuttgart HRB 380137<br>
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