[Paraview] Paraview 3 parallel rendering artefacts (with Points, Wireframes and Volume representations)

[Marc Baaden]

(NB: this is a follow-up on a previous thread with several issues, 
focusing on one of them )

kmorel at sandia.gov said:
>>> - there seem to be some artefacts for eg Volume Rendering or Points
>>> representation (presumably at the boundaries of the rendered
>>> sub-images). Can these artefacts be avoided or corrected for?

>> It would be helpful to see the artifacts. 

Ok, here are snapshots:
http://www.shaman.ibpc.fr/pv3_arefact1.png
http://www.shaman.ibpc.fr/pv3_arefact2.png
http://www.shaman.ibpc.fr/pv3_arefact3.png
http://www.shaman.ibpc.fr/pv3_arefact4.png

There are some kind of "ghost" planes that only appear when I use 
parallel rendering. The same data on a single node has none such 
planes. Furthermore the number of planes seems to depend on the number 
of processors: with two processors there is one plane dividing the data 
into two parts, with 4 processors there are two planes dividing into 
four parts.
I have seen this clearly with points, wireframe and volume 
representations. The artefacts depend on the viewing angle. One can 
make them disappear from some angle or make them more apparent choosing 
the right direction to look from.
Can it be avoided or corrected for?

Thanks in advance,
  Marc Baaden

NB: the snapshots were made using paraview 3.0.2 on MacOSX running a 
server on 4 processors
-- 
 Dr. Marc Baaden  - Institut de Biologie Physico-Chimique, Paris
 mailto:baaden at smplinux.de      -      http://www.baaden.ibpc.fr
 FAX: +33 15841 5026  -  Tel: +33 15841 5176  ou  +33 609 843217