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<div class="moz-cite-prefix">Thank you a lot!<br>
I couldn't yet find out why/where I create those ill-defined
triangles, but that's not you problem ;-P<br>
<br>
I have one last question:<br>
Can you tell me in a short, easy way the algorithm how Gmsh
creates new nodes inside the given surface-mesh?<br>
<br>
Regards,<br>
Steffen<br>
<br>
Am 19.03.2014 09:15, 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"
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">the difference between 0 and 0.0000000001 might
be a rounding error.<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">Now if you have holes in your surface if you
just delete all ill-defined triangles, I don’t know. It
depends on how you made your triangulation. IMO it would be
better to make sure that such triangles are not even be
created.
<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> Dienstag, 18. März 2014 21:47<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">What I just think about:<br>
I just deleted all the lines in my elements-list where
area is <= 0.000000001. Doesn't that mean that I have
small holes in my surface mesh now? How is Gmsh able to
work with this? I just don't understand why this makes a
difference compared to just check if area is = 0<br>
<br>
Steffen<br>
<br>
Am 18.03.2014 21:41, schrieb Steffen Becker:<o:p></o:p></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Hi,<br>
puh, that's weird:<br>
First I checked my triangles if their area is > 0 (to
get the ones which are aligned). This didn't helped as I
said in my last mail. Now I (just for fun) checked if
the area > 0.000000001 and now it works - but I don't
know why this is such a difference?!<br>
<br>
Anyway, thanks for your help!<br>
Steffen<br>
<br>
Am 18.03.2014 10:57, 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">there
are still ill-defined triangles, e.g. 2319, 2320,
2321.
</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">You can find that out by yourself by
inspecting your mesh with gmsh in the way I described
in my last 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">Remark: checking “surface faces” can help
to examine the surface.</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> Montag, 17. März 2014 22:39<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>
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:<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 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.</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 make sure that this kind
of thing cannot happen when you define the surface
mesh.</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 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 11:20<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">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>
</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>
<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>
<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>
<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>
<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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<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>
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>
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>
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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<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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<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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<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>
<br>
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