[Paraview] Volumes of Interest

[Berk Geveci]

I didn't mention Python because it doesn't give you a way of popping up a
file chooser - you have to edit the script and change the file name. Maybe
we should add a Python command to pop up the file chooser... It is not super
easy but if there is enough demand, we can do it. Feel free to add a feature
request to the bug tracker or uservoice.

-berk

On Thu, Feb 18, 2010 at 8:06 AM, Jean M. Favre <jfavre at cscs.ch> wrote:

> Natalie Happenhofer wrote:
> > Another topic - selecting volumes of interest: I can do that for one
> file, and it works well. But is it really necessary to repeat this procedure
> for every file I open in Paraview? Is it possible to select a volume of
> interest and for every file I open afterward, just this VoI is displayed?
> >
> >
> I would suggest doing this in Python in order to avoid reading the full
> resolution dataset by default. When opening a file, paraview forces you
> to click Apply before you can do anything else (such as creating an
> Extract Subset filter). Thus, the data reader uses
> UPDATE_EXTENT=WHOLE_EXTENT and you may run out of memory before being
> able to subset the grid.
>
> if instead, you instantiate your reader, do not execute it, do not
> create a representation for it, then create an Extract Subset with the
> VOI you desire, and then execute the whole thing, you will end-up
> passing the VOI extents upstream directly to the reader, and your reader
> will only execute once with the correct extents.
>
> Use the python shell and the followin example:
>
> reader = XMLImageDataReader( FileName= '/path/to/data/foo.vti'] )
> reader.PointArrayStatus = ['data1']
>
> ExtractSubset1 = ExtractSubset()
>
> ExtractSubset1.VOI = [2000, 2255, 2000, 2255, 2000, 2255]
>
> DataRepresentation2 = Show(ExtractSubset1)
>
> Render()
>
> Jean--
> Swiss National Supercomputing Center
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