[Paraview] d3 poor domain decomposition

[Burlen Loring]

I wanted to report a situation where D3 is generating really poor domain 
decomposition. In this case it's taking decent data locality and 
destroying it. This is a multiblock with 8 polydata surfaces. Screen 
shot shows result with 4 mpi ranks, 8 produces a similar result. D3 
usually does a great job, so maybe this has hit some of its weak spots. 
I'm surprised that there are so many disconnected regions on each rank 
and that it doesn't retain any of the initial data locality. Although 
here I was just experimenting trying to get a more even data 
distribution by using d3, I think similar use cases arise frequently. 
for example the need to re-balancing the data distribution after an 
iso-surface in parallel. Should this be considered a bug?






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