[Paraview] Xdmf GlobalID attribute removed by Clip

[David E DeMarle]

The XDMF in 3.6 did not have the global id attribute so it did the
unsafe thing and let filters have their way with them. It kept the
array around, but in most cases the values in the array at the end of
the pipeline were worthless.

Not that XDMF does have global ids, the clip filter (like most of the
other filters) is doing the safe thing and not keeping the globalids.

Off the top of my head, I can not think of a reason really why the
clip filter shouldn't be allowed to copy the globalids across though.

Erik, try this and see if it works for you:

in vtkTableBasedClipDataSet, look for the three places where it calls
CopyAllocate.
For example:
   outPD->CopyAllocate(inPD, nOutPts);

Insert a line before each one of those that tells VTK that it is OK
top copy this array across.
In that case:
   outPD->SetCopyGlobalIds(1,vtkDataSetAttributes::COPYTUPLE);

The globalIDS will then make it through this filter.

David E DeMarle
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x109



On Mon, Apr 19, 2010 at 1:48 PM, Eric E. Monson <emonson at cs.duke.edu> wrote:
> Hello,
>
> It seems that we're sort of getting the worst of both worlds right now ParaView and Xdmf GlobalID AttributeType: Besides not being read in as "idtype", a Clip filter removes the GlobalID attribute from the data set.
>
> Attached is a simple XML example adapted from the Xdmf source data sets, but with a duplicate scalar point attribute labeled as AttributeType="GlobalID". Load it into PV and apply a Clip filter and you'll see the IDvalues array disappear.
>
> I see this behavior with PV 3.8-RC1 and last week's CVS, but not with 3.6.2. I can't remember if the Xdmf reader in 3.6.2 had GlobalID type or not. (OS X 10.6.3)
>
> I can file a bug report for this if someone can replicate it.
>
> Thanks a lot,
> -Eric
>
> ------------------------------------------------------
> Eric E Monson
> Duke Visualization Technology Group
>
>
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