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<div class="moz-cite-prefix">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:<br>
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<div class="moz-cite-prefix">Wrong .geo file, sorry!<br>
<br>
Am 12.03.2014 18:21, schrieb Steffen Becker:<br>
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<div class="moz-cite-prefix">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:<br>
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<div class="moz-cite-prefix">Hi,<br>
<br>
FYI - you can remove double vertices/edges (or repair) in
mesh in FreeCad (for exampe).<br>
<br>
regards<br>
Roman<br>
<br>
<br>
<br>
W dniu 12.03.2014 10:17, Steffen Becker pisze:<br>
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<div class="moz-cite-prefix">Hi Matthias & Roman,<br>
<br>
I create a nodes- and elements-list like this:<br>
# nodes:<br>
N1 0,0,0<br>
N2 0,1,0<br>
N3 1,0,0<br>
N4 0,0,1<br>
# elements, which describe triangles:<br>
E1 1,2,3<br>
E2 2,3,4<br>
<br>
So I do have double edges (here: between node 2+3). Didn't
now that this is a problem for gmsh, sorry.<br>
<br>
I will try Romans solution asap and give you a feedback.<br>
Thank you both!<br>
<br>
Steffen<br>
<br>
<br>
Am 12.03.2014 09:59, schrieb Zenker, Dr. Matthias:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi
Steffen,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">I am not totally sure from what you
wrote that there are really no duplicated nodes. In
gmsh, you need to define the surfaces in a way that
neighbouring surfaces/facets with a common border
use the _<i>same</i>_ nodes to define the border. I
could not see from your file if there are duplicated
nodes, and would propose that you make sure that
there are really no such duplications.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">If the meshing still fails, then this
is a question for the real gurus (Christophe?).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">HTH,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Matthias<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div style="border:none;border-left:solid blue
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<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"
lang="EN-US">Von:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"
lang="EN-US"> Roman Fratczak [<a
moz-do-not-send="true"
class="moz-txt-link-freetext"
href="mailto:fratczakroman@o2.pl">mailto:fratczakroman@o2.pl</a>]
<br>
</span><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">Gesendet:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
Mittwoch, 12. März 2014 09:51<br>
<b>An:</b> Steffen Becker<br>
<b>Cc:</b> <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><br>
<b>Betreff:</b> Re: [Gmsh] Error : Self
intersecting surface mesh, computing
intersections (this could take a while)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Steffen,<br>
<br>
No it is more clear. If you are working with cloud
of point, then you may use Meshlab for surface
regeneration. There are many software that are
able to handle in a resonable way the cloud of
points (like rhino3D + resurf, other). But these
are rather commercial.<br>
<br>
From the other side - try to do the simplest
thing:<br>
<br>
Adjust your python script for surface creation in
order to save not as PLY but as GMSH "geo" file
using points and lines<br>
<br>
Point(1)={0,0,0} ;<br>
Point(2)={0,1,0} ;<br>
...<br>
<br>
Line(1) = {1,2};<br>
..<br>
and.. Line Loop & Surface -> Volume ..<br>
<br>
Then you will get a volume defined by geometric
entities. In this case is shoul be easier to
create a better mesh on surface and then on whole
volume.<br>
<br>
Regards<br>
Roman<br>
<br>
<br>
<br>
W dniu 11.03.2014 17:59, Steffen Becker pisze:<o:p></o:p></p>
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<p class="MsoNormal">Hi,<br>
<br>
@ Roman:<br>
some more details:<br>
I have a point cloud given and generate the
surface mesh by myself (with python). I don't
know a good algorithm to create a volume mesh
out of this surface mesh - that's why I use gmsh
for this task.<br>
I also checked my surface mesh for double
vertexes but I didn't find any. What do you mean
with "double egdes"? Isn't there always a
"double edge", because two neighbour facets
always have one same edge?!<br>
<br>
I will send you a .step or .iges file as soon as
I figured out how to handle the "No OpenCASCADE
model found" error.<br>
<br>
I'm appending the other mailing history (with
Matthias) to this mail - sorry for that "double
mailing", I just forgot one time to "reply to
all" -.-<br>
Anyone else has an idea why the meshing fails?<br>
<br>
Regards and thank you a lot,<br>
Steffen<br>
<br>
<br>
<br>
<o:p></o:p></p>
<pre>Hi Steffen,<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>I don't see either why the meshing fails, sorry.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Matthias<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>-----Ursprüngliche Nachricht-----<o:p></o:p></pre>
<pre>Von: Steffen Becker [<a moz-do-not-send="true" href="mailto:steffenbecker87@yahoo.de">mailto:steffenbecker87@yahoo.de</a>]<o:p></o:p></pre>
<pre>Gesendet: Dienstag, 11. März 2014 14:42<o:p></o:p></pre>
<pre>An: Zenker, Dr. Matthias<o:p></o:p></pre>
<pre>Cc: <a moz-do-not-send="true" href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><o:p></o:p></pre>
<pre>Betreff: Re: [Gmsh] Error : Self intersecting surface mesh, computing<o:p></o:p></pre>
<pre>intersections (this could take a while)<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Oh I'm really sorry, here is the file.<o:p></o:p></pre>
<pre>In addition I sent you also the intersect.pos. I don't understand why exactly<o:p></o:p></pre>
<pre>these surfaces are problematic and the "neighbour surfaces"<o:p></o:p></pre>
<pre>aren't - although they have the same geometry =/<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Am 11.03.2014 12:07, schrieb Zenker, Dr. Matthias:<o:p></o:p></pre>
<pre>Hi Steffen,<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>if you don't provide the myfile.ply2, we cannot see your geometry...<o:p></o:p></pre>
<pre> You can visualize intersect.pos by merging it to your geometry.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>HTH,<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Matthias<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<p class="MsoNormal">Am 11.03.2014 14:33, schrieb
Roman Fratczak:<o:p></o:p></p>
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<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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<div>
<p class="MsoNormal">Hello Steffen,<br>
<br>
Yes. You can try to the first Optimize
quality of tetra, or all of them (just
try).<br>
<br>
I don't know how your model looks like. If
the elements on the surface are too big,
then the solid elements (probably
tetragonal) may be with intersecting edges
or faces. Therefore the reducing size of
element may help (especially on the
surfaces).<br>
<br>
Or- just share your model (ply) -in order
to be more precise.<br>
<br>
regards<br>
Roman<br>
<br>
<br>
<br>
W dniu 10.03.2014 18:06, Steffen Becker
pisze:<o:p></o:p></p>
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style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Hi Roman,<br>
when you say "enable option: optimize",
you mean" Tools -> Options -> Mesh
-> Advanced -> Optimize quality of
tetrahedra, Optimize quality of
tetrahedra with Netgen, Optimize high
order meshes (experimental)" ?<br>
And why is reducing element size
important? In my case it is important
that the object has such "90 degree
corners".<br>
<br>
Regards,<br>
Steffen<br>
<br>
Am 10.03.2014 16:55, schrieb Roman
Fratczak:<o:p></o:p></p>
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style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Hi Steffen,<br>
<br>
If your volume is OK (is really a
closed one) - try to:<br>
<br>
1. Reduce element size (especially in
a curved shapes)<br>
2. Enable option "Optimize" - in mesh
options <br>
<br>
Regards<br>
Roman<br>
<br>
<br>
<br>
W dniu 10.03.2014 16:41, Steffen
Becker pisze:<o:p></o:p></p>
</div>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Hello everyone, <br>
<br>
I'm a gmsh beginner and I want to
create a 3D volume mesh out of a given
surface-mesh but I got the error
message as seen in the subject. You
find my .geo file in the appendix. <br>
Can anyone tell me what I have to do
to create a 3D mesh? I even can't
figure out where the intersection are
located (don't know how to read the
intersect.pos). <br>
Sorry for my poor english. <br>
<br>
Regards, <br>
Steffen <br>
<br>
<br>
<br>
<o:p></o:p></p>
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<br>
<br>
<br>
<o:p></o:p></p>
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