[Paraview] artifacts in image data volume rendering

[Burlen Loring]

Hi Aashish,

Great! I've been seeing this bug for a long time going back at least to 
ParaView 3.8. It's image data, and I have used the ray cast only option 
in ParaView which in the end (via vtk smart volume mapper) corresponds 
to the vtk fixed point volume mapper. For this run I used 256 procs, I 
can share the data and a state file if it would help.

Burlen

On 10/23/2014 12:41 AM, Aashish Chaudhary wrote:
> Burlen,
>
> this certainly looks like the parallel compositing issue to me and we 
> have seen it before. Just to be clear what mapper you were using to 
> generate this image?  I would love to track dow this issue and
> can certainly use your help here.
>
> - Aashish
>
> On Wed, Oct 22, 2014 at 11:01 AM, Burlen Loring 
> <burlen.loring at gmail.com <mailto:burlen.loring at gmail.com>> wrote:
>
>     Hi, I'm encountering what look like process boundaries in image
>     data volume rendering. This is view dependent, only certain camera
>     locations reveal the issue. In examples below these are
>     "horizontal line" like artifacts. This data is large, and I have
>     not been able to successfully volume render after tetrahedralizing
>     it. I'm not sure if it's just insanely slow or there's a deadlock.
>     My attempts have been up to 1024 procs with 8 per node (8 GB per
>     proc), That's about the smallest I can to get enough ram to do the
>     terahedralization, about 50% of the ram is used after the
>     tetrahedralization.  Does anyone know if the fixed point vr
>     algorithm is parallel aware, would adding ghost zones to the image
>     data help??
>
>
>
>
>
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> -- 
> /| Aashish Chaudhary
> | Technical Leader
> | Kitware Inc.
> /
> /| http://www.kitware.com/company/team/chaudhary.html/

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