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<div class="moz-cite-prefix">Hi Matthias,<br>
<br>
thank you for your help!<br>
I think I successfully deleted all the triangles with zero
surface. Unfortunately the same error still appears (but at least
with much less intersections). You find my new .msh file in the
appendix. Do you have more ideas?<br>
<br>
Regards,<br>
Steffen<br>
<br>
Am 17.03.2014 11:37, 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">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 think you have ill-defined triangles in your
mesh. For example, there is a triangle 15328 which contains
the nodes 7358, 7359, and 7360. But these nodes are aligned,
so the triangle has zero surface. I would suspect this kind
of problem to be the cause for the failure. I discovered
that by examining your mesh after merging the intersect.pos,
and by displaying node labels and surface labels in gmsh. I
saw that this triangle was not visible, just its label, and
searched for “15328” in your msh file to see what nodes it
contains.<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 make sure that this kind of thing
cannot happen when you define the surface mesh.<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 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> Montag, 17. März 2014 11:20<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">Here it is.<br>
<br>
Am 17.03.2014 11:14, 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 found out: Outlook is wrong.</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 just discovered a small info saying that
Outlook thinks that my_file.msh is insecure and that it
has deleted the attachment (Grrrr). So the fault was on
my side, sorry. Could you try to send it again with a
changed extension, e.g. rename it to my_file.msh.txt?</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> Montag, 17. März 2014 10:55<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 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:<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">in the mail you mention there is only a
geo file…</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> Freitag, 14. März 2014 21:09<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>
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>
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<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>
<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>
<br>
<br>
<br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>gmsh mailing list<o:p></o:p></pre>
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</blockquote>
<p class="MsoNormal"><br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
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<br>
<br>
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<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
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