[Paraview] FW: Coloured isosurfaces when running MPI

[Utkarsh Ayachit]

That's very peculiar. What datatype are you contouring? (With the
reader selected in the pipeline browser, go to the information tab,
what does the "Type" field say?) Also after generating the
iso-surface, open the statistics inspector (View | Statistics
Inspector). What is the size of the geometry generated from  the
contour filter. If that's not too large, you try doing local-rendering
(go to Edit | Settings, on the Server page, uncheck Remote Render
Threshold). Does that help? This will help diagnose if the issue is
with rendering or with the data generated by the contour filter
itself.

Utkarsh

On Sun, Jun 19, 2011 at 11:25 AM, Philipp Schlatter
<pschlatt at mech.kth.se> wrote:
> Dear forum,
>
> I am using Paraview to visualise a large dataset coming from a direct
> simulation of turbulence (size of the original data of order 10-100GB).
> Naturally, I am running in parallel on a cluster (using the mesa), which
> also works very well.
>
> However, there is one issue: I want to visualise isosurfaces of a quantity,
> and colour them using another scalar quantity. When running serial,
> everything is fine. When using multiple processors with MPI leading to the
> data being distributed, the rendering of the isosurfaces is still ok.
> However, the colouring seems to be based on the scalar field of the first
> data segment (i.e. the first processor) only. This then leads to very
> visible boundaries between the processors as the colours are clearly not
> correct (see example on
> http://www.mech.kth.se/~pschlatt/files/resampled.jpg). Again, running on a
> single processor everything is correct, and running on different numbers of
> processors will shift the edges.
>
> This issue could be confirmed in all version up to 3.10.
>
> Due to this, I am required to run in serial, which is very painful both due
> to memory requirements and very long rendering times (up to 15 minutes for a
> single frame). Thus, if there would be a simple fix, I'd be very interested.
>
> Thanks a lot in advance for any hint.
> Best regards,
> Philipp Schlatter
> KTH Mechanics, Stockholm, Sweden
>
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