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<div class="moz-cite-prefix">Hi,<br>
<br>
sorry, that was unfortunate: I had accidentally attached the case
for dist = 2.1, which works also here. For larger dists (e.g. 3.5)
it fails, see new attachment.<br>
<br>
It fails with all the triangulation methods, and the resulting
triangulation always shows weird artifacts (see attached
screenshot), but at different places depending on the
triangulation method.<br>
<br>
Thank you for your rapid answer<br>
<br>
Johannes<br>
<br>
<br>
On 03/13/2013 02:11 PM, Christophe Geuzaine wrote:<br>
</div>
<blockquote
cite="mid:FAAD22CB-21A1-41EE-ADD1-5AB29073E37E@ulg.ac.be"
type="cite">
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Hi Johannes,
<div><br>
</div>
<div>That's weird - it seems to work fine over here (cf
screenshot). I will test it on our Linux machine when I have the
time.</div>
<div><br>
</div>
<div>Does it happen with all the triangulation methods (MeshAdapt,
Delaunay, Frontal, Delaunay for quads)?</div>
<div><br>
</div>
<div><br>
</div>
<div>Christophe</div>
<div><img id="3a59c91a-7926-4974-b666-51aae2148d24"
apple-width="yes" apple-height="yes"
src="cid:part1.00090103.08070301@unifr.ch" width="958"
height="837"></div>
<div><br>
<div>
<div>On 13 Mar 2013, at 13:32, Johannes Reinhardt <<a
moz-do-not-send="true"
href="mailto:johannes.reinhardt@unifr.ch">johannes.reinhardt@unifr.ch</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">Hello everybody,<br>
<br>
first I want to thank everybody involved in the development
of gmsh. It is a really great tool and has helped me a lot
in my research.<br>
<br>
However I run into a probem when I try to create a 2D quad
mesh with the outline of two superimposed disks embedded.
However Blossom almost always fails with the message:<br>
<br>
Warning : Perfect Match Failed in Quadrangulation, Applying
Graph Splits<br>
<br>
printed 10 times. I attached a simple geometry file that
shows this problem.<br>
<br>
For small distances (e.g. dist=2.1) this problem does not
occur, but for larger distances (and these are the ones that
I want to study), I always get this error.<br>
<br>
For other geometries where I had this problem, playing a bit
with the mesh element sizes helped, but I could not find
good numbers for this case. I also tried both DelQuad and
MeshAdapt as Meshing Algorithms, but I always get the error
above.<br>
<br>
I briefly looked at the Blossom Quad publication, but could
not find any explanation for this behaviour. My best guess
is, that the embedded curve conflicts with a perfect
matching, and the extra edges mechanism fails in this case.<br>
<br>
I tested both gmsh 2.6.1 compiled from source and the
precompiled gmsh 2.7.0 Linux 64bit binary on Ubuntu 11.10,
both show the same behaviour.<br>
<br>
Has anybody an idea how to reformulate the geometry
description to avoid this problem?<br>
<br>
Thanks in advance and greetings<br>
<br>
Johannes<br>
<span><tip.geo></span>_______________________________________________<br>
gmsh mailing list<br>
<a moz-do-not-send="true" href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><br>
<a class="moz-txt-link-freetext"
href="http://www.geuz.org/mailman/listinfo/gmsh">http://www.geuz.org/mailman/listinfo/gmsh</a><br>
</blockquote>
</div>
<br>
<div apple-content-edited="true">-- <br>
Prof. Christophe Geuzaine<br>
University of Liege, Electrical Engineering and Computer
Science <br>
<a moz-do-not-send="true"
href="http://www.montefiore.ulg.ac.be/%7Egeuzaine">http://www.montefiore.ulg.ac.be/~geuzaine</a><br>
<br>
<br>
</div>
<br>
</div>
</blockquote>
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