[Paraview] Best way to make a part of a 3D field/VR invisible

[Stéphane Backaert]

Dear all,

I have a big rectangular 3D field (few GB) sitting on a uniform grid (hdf5+xdmf reader, 3DCORECTMesh topology).
I would like to make a 3D volume rendering but only on a part of it as this scheme tries to show:
/------/
/-----/  |------/
|      l-------/  |
|_______| / 
This helps me to visualize something placed near the center… Unfortunately, a "clip" or an "extract subset" do not help me… 

Actually, I already did this operation but with some tricky operations like putting  the points of interest to zero directly in the hdf5 dataset…
(I did it serially, it took one night…). I am looking for a smarter way to do that…

Does anyone have an idea to do this? If it could also use the parallel feature of PV ;-)

Stephane

PS: this is not my first attempt, for example I tried with a custom filter: 
http://www.paraview.org/pipermail/paraview/2012-April/024738.html
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