[Paraview] tube filter, surfaces aren't closed?

[burlen]

FYI, I re-organized the images illustrating the bug, and made a 
comparison of nvidia to mesa rendering on two cases 1) the artifacts 2) 
the parallel inconsistency, and removed the older images.

1)
http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/mesa-artifacts.png
http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/nvidia-no-artifacts-decomp.png

2)
http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/mesa-artifacts-decomp.png
http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/nvidia-no-artifacts.png

burlen wrote:
> So you are right these are artifacts not holes. Nasty looking ones at 
> that. zooming in enough makes the artifacts receded toward the egdes 
> of the tube. After some experimentation I'm finding that this has 
> something to do with mesa. It is reproducible only when using mesa. 
> Hardware rendering works fine, no artifacts.
>
> There also looks to be two things going on, 1) the artifacts, 2) 
> inconsistent selection of the visible faces on parallel runs.  This is 
> shown here: 
> http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/decomp-8-procs.png 
>
>
> I was using PV on this cluster fine back in dec to make very similar 
> figures with stream tubes and didn't see any of these issues...
>
> I added the dataset to reproduce to the bug report.
>
> Moreland, Kenneth wrote:
>> It could be a rendering artifact.  What happens when you zoom into 
>> the problem area?
>>
>> -Ken
>>
>>
>> On 1/14/10 12:24 AM, "burlen" <burlen.loring at gmail.com> wrote:
>>
>>     Any ideas as to why tubes from the tube filter aren't closed 
>> surfaces
>>     now? screenshot:
>>     http://public.kitware.com/Bug/view.php?id=10139
>>
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>>    ****      Kenneth Moreland
>>     ***      Sandia National Laboratories
>> ***********  *** *** ***  email: kmorel at sandia.gov
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>