[Paraview] ParaView 4.0.1 Opacity performance (UNCLASSIFIED)

Wed Sep 11 11:14:48 EDT 2013

Classification: UNCLASSIFIED
Caveats: NONE

I am working on a CTH dataset with 1024 spcth files.    I'm able to extract
8 CTH parts using the "CTH Extract Parts" filter and things work reasonably
well.  In client-server mode, I'm able to interact with the data, rotate,
translate, scale, etc without any noticeable performance issues.   By
default, I have distributed rendering enabled and the interactive
performance is good.

However, if I enable opacity on any of those CTH parts that I extract,
interactive performance drops to the point of being unusable.     Once
enabled, it takes about 10 minutes for ParaView to update the GL window.
I've tried diddling with the render window settings - such totally disabling
distributed rendering, but it doesn't seem to make any difference on the
performance with opacity.

I've also saved out animations of this dataset and use the "disconnect"
feature.    Without opacity enabled, I can march through time at something
slightly less than 1 timestep/minute running in disconnected batch mode.
With opacity enabled on any one of the parts,  it takes ~10
minutes/timestep.       

On the server side, I have paraview 4.0.1 built with the OSMesa library
that's downloaded as part of the superbuild.    I'm assuming that opacity
should not totally destroy performance as we're seeing.     There are other
packages that we use in client-server mode with opacity that show no
noticeable performance degradation when using opacity.  

Thanks
________________________________

Rick Angelini
USArmy Research Laboratory
CISD/HPC Architectures Team
Building 120 Cube 315
Phone:  410-278-6266

Classification: UNCLASSIFIED
Caveats: NONE

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