[Paraview] paraview plugin for vtkImageGaussianSmooth

[Burlen Loring]

Hi Kate,

It shouldn't be too hard for you to expose the vtkImageGaussianSmooth in 
PV.  I have one caveat for you re: using vtkImageGaussianSmooth in 
parallel: when it runs it will trigger a complete re-execution of your 
entire pipeline including the reader.This happens because 
vtkImageGaussianSmooth increases the update extents which, unless 
something has changed in the recent version of PV, would be satisfied by 
the reader re-executing. this could cause you some performance related 
issues especially for large data where I/O becomes a significant 
bottleneck. On the other hand, this re-execution would happen only when 
running in parallel and if you have small data it might not be too bad.

I encountered this issue a while back. with our data size the additional 
I/O was unacceptable. i wrote a parallel ghost cell generator for image 
data to prevent the pipeline re-execution for operations like kernel 
convolution that require ghost cells. The plugin includes a kernel 
convolution filter as well. To use it you'd have to build and load our 
plugin and add the "image ghosts" filter right before the "kernel 
convolution" filter. Our kernel convolution filter also has a CUDA 
implementation that's about 20x faster than the cpu version (note: CUDA 
stuff is still being developed, still some issue when update extent is 
too large to fit on the gpu). I'm attaching a link to the latest release 
of the plugin in case you could use it. It requires a parallel build of 
PV. http://www.hpcvis.com/SciVisToolKit/SciVisToolKit-12.02.tar.gz

Burlen

On 03/14/2012 10:16 AM, FISSELL at pitt.edu wrote:
> Hi,
>
> I didn't see a paraview plugin for the  vtkImageGaussianSmooth.cxx filter
> in the paraview Filters menus or the filters.xml file.
> Is there some equivalent ?
>
> If not:  am I right that I will need to write a little paraview plugin
> wrapper in
> order to be able to use vtkImageGaussianSmooth in a pvpython script ?
> Any reason other than somewhat ugly parameter specification or lack
> of interest/time that there isn't a plugin ?
>
> thanks
> kate
>
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