[Paraview] connectivity of partitioned unstructured grid

[Berk Geveci]

Hi Jean,

I don't think that the problem is with D3. I suspect that it is with
the connectivity filter, which is not parallel-aware. Ghost levels are
not enough (or necessary) for this to work in parallel. Rather, there
needs to be some parallel merge algorithm to identify connected
regions across partition boundaries. Unfortunately, we don't have
anything like that at the moment.

-berk

On Fri, Feb 22, 2013 at 10:31 AM, Favre  Jean <jfavre at cscs.ch> wrote:
> Hello
>
> I have an hexahedral grid, in a *vtu file. When read on a local client, the Connectivity filter *correctly* detects that there is a single region (with Extract All Regions).
>
> The same *vtu file, when read in parallel, shows multiple regions, with *some* region boundaries matching processor boundaries.
>
> Adding D3 in between, makes things even worse, as some cells are completely dropped. Yet, the cells are only hexahedra, thus with face-to-face connectivity. Can D3 be forced to generate ghost cells which would ensure correct region extraction?
>
> -----------------
> Jean/CSCS
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