[Paraview] Xdmf GlobalID attribute removed by Clip

[Eric E. Monson]

Hey Dave,

I'll definitely try this sometime early next week, but I just wanted to point out something else, first, that may be interfering somewhere:

If you look at the output of the Xdmf reader, like you said, it has allowed Global IDs to be set on the PointData, but they are not read in as idtype (mine says Data type: long), so they aren't recognized by things like the Selection Inspector as real Global Node IDs (the list ends up blank if you try to switch the Selection Type to Global Node IDs). So, I don't know if there is something strange happening when the clip filter tries to copy across the GlobalIds since they're not really of the correct type?

Anyway, thanks for getting back to me on this and I'll let you know how it goes.
-Eric


On Apr 23, 2010, at 4:11 PM, David E DeMarle wrote:

> 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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