[Paraview] Delaunay3D

[Weiguang Guan]

Hi Will,

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.

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.

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).

Another question: is there another filter that constructs a grid from a 
set of points?

Weiguang


On 5/22/2018 3:42 PM, Will Schroeder wrote:
> What version of ParaView? Mine works just 
> fine..... 5.5.0-323-g37ce137a21 64-bit
>
> image.pngimage.png
>
>
>
> On Tue, May 22, 2018 at 3:05 PM Weiguang Guan <guanw at rhpcs.mcmaster.ca 
> <mailto:guanw at rhpcs.mcmaster.ca>> wrote:
>
>     Dear Paraview users,
>
>     Based on the documentation, Delaunay3D will construct a 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:
>     (1) Sources->Point source, and set Number of points to N (I
>     experiment with different N=5 and N=20)
>     (2) Using sphere glyph to display these points
>     (3) Apply filter "Delaunay 3D" to the points with alpha=0 and
>     display the resultant unstructured grid as wireframe.
>
>     When N=20, I can see some of the points are ignored in the process
>     of Delauney triangulation.
>     When N=5, The resultant unstructured grid has 3 cells while I
>     think it should have only 2 tetrahedra.
>
>     Can someone explain it? Thanks a lot.
>
>     Weiguang
>
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> -- 
> William J. Schroeder, PhD
> Kitware, Inc. - Building the World's Technical Computing Software
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-- 
--
Weiguang Guan
Research Scientist
RHPCS, McMaster University
Phone: 905-525-9140 x22540

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