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<div class="moz-cite-prefix">Hi Kenneth,<br>
<br>
Sorry for my unclear description of the problem in previous
emails. You actually explained what happened in the second
paragraph of your email. Now I do "Extract Edges" and see all the
edges. But yesterday I saw some internal points have no edges
connecting to them (I referred them as dangling points) when
displaying the Delaunay triangulation grid in wireframe, and
didn't realize it shows only the wireframe of the surface. Thank
you for pointing this out. It all makes sense now.<br>
<br>
Best,<br>
Weiguang<br>
<br>
<br>
On 5/22/2018 4:15 PM, Moreland, Kenneth wrote:<br>
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<p class="MsoNormal"><span style="color:windowtext">Weiguang,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">I just want
to clarify something quickly with your question. When you
say “</span><span style="color:#404040">some of the points
are ignored in the process of Delauney triangulation” and “</span>dangling
points,” do you mean that you can see some spheres that are
inside the rest of the spheres?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I note in your description that you said
you are looking at the wireframe of the Delaunay
triangulation. The wireframe representation actually only
shows the wireframe of the
<i>surface</i>. You will not see the edges on the interior of
the mesh, so any points that are on the interior will not look
connected even if they are.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Instead of showing the wireframe, run the
Extract Edges filter (which will show a wireframe of
<i>all</i> edges). Does that connect the points like you
expect?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-Ken<span style="color:windowtext"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
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<div style="border:none;border-top:solid #E1E1E1
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<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span
style="color:windowtext"> ParaView
[<a class="moz-txt-link-freetext" href="mailto:paraview-bounces@public.kitware.com">mailto:paraview-bounces@public.kitware.com</a>]
<b>On Behalf Of </b>Weiguang Guan<br>
<b>Sent:</b> Tuesday, May 22, 2018 1:58 PM<br>
<b>To:</b> Will Schroeder
<a class="moz-txt-link-rfc2396E" href="mailto:will.schroeder@kitware.com"><will.schroeder@kitware.com></a><br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:paraview@public.kitware.com">paraview@public.kitware.com</a><br>
<b>Subject:</b> [EXTERNAL] Re: [Paraview] Delaunay3D<o:p></o:p></span></p>
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</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Hi Will,<br>
<br>
Thank you very much for your time. I've tried v5.5 and v5.2.
This "issue" doesn't seem to have anything to do with the
versions.<br>
<br>
First of all, I would like to change my words for the N=5
case, where there might be 2, 3, or even 4 terahedra
depending on the relative locations of the 5 points.
<br>
<br>
However, the question for the N=20 case is still pending
one. You can see the dangling points if you change the
representation from "surface" to "wireframe". I basically
have similar result as yours. Because the point source
generates point cloud with random positions of points, you
will see different results each time you change the
parameters of Point Source (either number of point or the
radius).<br>
<br>
Another question: is there another filter that constructs a
grid from a set of points?<br>
<br>
Weiguang<br>
<br>
<br>
On 5/22/2018 3:42 PM, Will Schroeder wrote:<o:p></o:p></p>
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<div>
<p class="MsoNormal"><span
style="font-family:"Verdana",sans-serif">What
version of ParaView? Mine works just
fine..... 5.5.0-323-g37ce137a21 64-bit<o:p></o:p></span></p>
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style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="font-family:"Verdana",sans-serif"><img
style="width:4.6562in;height:5.8541in"
id="_x0000_i1025"
src="cid:part1.02080408.09040808@rhpcs.mcmaster.ca"
alt="image.png" height="562" width="447"><img
style="width:5.4166in;height:5.8541in"
id="_x0000_i1026"
src="cid:part2.03080904.03030001@rhpcs.mcmaster.ca"
alt="image.png" height="562" width="520"><br>
<br>
<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">On Tue, May 22, 2018 at 3:05 PM
Weiguang Guan <<a moz-do-not-send="true"
href="mailto:guanw@rhpcs.mcmaster.ca">guanw@rhpcs.mcmaster.ca</a>>
wrote:<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">Dear
Paraview users,<br>
<br>
Based on the documentation, Delaunay3D will
construct a <span style="color:#404040">
3D Delaunay triangulation from a list of input
points if alpha=0. But I did an experiment that
gave a different result. Here are the steps:<br>
(1) Sources->Point source, and set Number of
points to N (I experiment with different N=5 and
N=20)<br>
(2) Using sphere glyph to display these points<br>
(3) Apply filter "Delaunay 3D" to the points with
alpha=0 and display the resultant unstructured
grid as wireframe.<br>
<br>
When N=20, I can see some of the points are
ignored in the process of Delauney triangulation.
<br>
When N=5, The resultant unstructured grid has 3
cells while I think it should have only 2
tetrahedra.<br>
<br>
Can someone explain it? Thanks a lot.<br>
<br>
Weiguang</span><o:p></o:p></p>
</div>
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<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">William J. Schroeder, PhD<br>
Kitware, Inc. - Building the World's Technical
Computing Software<br>
28 Corporate Drive<br>
Clifton Park, NY 12065<br>
<a moz-do-not-send="true"
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(518) 881-4902<o:p></o:p></p>
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<p class="MsoNormal"><br>
<br>
<br>
<o:p></o:p></p>
<pre>-- <o:p></o:p></pre>
<pre>--<o:p></o:p></pre>
<pre>Weiguang Guan<o:p></o:p></pre>
<pre>Research Scientist<o:p></o:p></pre>
<pre>RHPCS, McMaster University<o:p></o:p></pre>
<pre>Phone: 905-525-9140 x22540<o:p></o:p></pre>
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<br>
<pre class="moz-signature" cols="72">--
--
Weiguang Guan
Research Scientist
RHPCS, McMaster University
Phone: 905-525-9140 x22540
</pre>
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