[Paraview] Parallel unfriendly filters?

[David Ortley]

I'm running Paraview in client/server mode with the server running on an
HPC platform across multiple nodes.

My input is a multi-block silo file that contains ghost zone information.
The way I do a seamless contour when visualizing on my workstation is to do
the following:

Load the silo file
    -> Threshold out the ghost zones (threshold filter)
        -> Merge the blocks
            -> Cell data to point data
                -> Contour

This works well enough when on a single machine.  But when visualizing
client/server with the server running across multiple nodes, there appear
seams on the contours.

Is this an expected behavior given my setup?  Are any of the filters that I
listed above (Threshold, Merge Blocks, Cell data to point data, and
Contour) not fully implemented in parallel yet?

nb - I've not spent a lot of time trying to debug the problem, so I don't
know if the problem exists when a server is running on a single node only.
It looks like something that is happening at node boundaries, but I could
be wrong and it could be a per/processor thing.

Thanks.

-David Ortley
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