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<div class="moz-cite-prefix">Hi Matthias,<br>
<br>
I don't know what's wrong here.<br>
When I check my mails, there is a .msh file in the mail from
12.03.2014 18:21 and also one in the mail from 14.03.2014 12:33.<br>
Finally, I sent you again a .msh file in this mail. Do you receive
it?<br>
<br>
Steffen<br>
<br>
<br>
Am 17.03.2014 09:52, 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">in the mail you mention there is only a geo
file…<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> Freitag, 14. März 2014 21:09<br>
<b>An:</b> Zenker, Dr. Matthias<br>
<b>Cc:</b> Roman Fratczak; <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 Matthias,<br>
<br>
hm, I sent it on 12.03.2014 18:21, don't know what went
wrong.<br>
As you see, I created a ASCII .msh file as explained in
the documentation, so I hope it's correct.<br>
What can I do now?<br>
<br>
Steffen<br>
<br>
Am 14.03.2014 13:05, 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">there was no msh file in any of your mails.</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">Depending on what is in the msh file, your
steps seem correct to me.</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 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">Von:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
Steffen Becker [<a moz-do-not-send="true"
href="mailto:steffenbecker87@yahoo.de">mailto:steffenbecker87@yahoo.de</a>]
<br>
<b>Gesendet:</b> Freitag, 14. März 2014 12:33<br>
<b>An:</b> Zenker, Dr. Matthias<br>
<b>Cc:</b> Roman Fratczak; <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 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
<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">intersections,
but when I check my nodes for duplicates I can't
find any.<br>
</span>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:<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"
lang="EN-US">Hi Steffen,</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">you should be able to generate a filled
volume mesh if you follow my suggestion from the
other mail:</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">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.</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">Von:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
Steffen Becker [<a moz-do-not-send="true"
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
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,<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>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<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>
<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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<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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<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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<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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<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>
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<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>
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<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>
<br>
<br>
<o:p></o:p></p>
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