[vtkusers] PedigreeIds arrays don't propogate accross a pipeline

[Eric E. Monson]

Hey Jenya,

I'm not totally sure, but it may be that you're having problems because you're assigning the Pedigree IDs "outside the pipeline". So, when the pipeline updates, it doesn't know to re-run your pedigree ids assignment statement. Instead of that first line, try putting a vtkAssignAttributes filter into the pipeline:

http://www.vtk.org/doc/nightly/html/classvtkAssignAttribute.html

with a call something like:

m_assignAttributes->Assign("arrayName", vtkDataSetAttributes::PEDIGREEIDS, vtkAssignAttribute::POINT_DATA);

or 

m_assignAttributes->Assign(vtkDataSetAttributes::SCALARS, vtkDataSetAttributes::PEDIGREEIDS, vtkAssignAttribute::POINT_DATA);

will work if the array you want is already the "active" scalar attribute.

-Eric

------------------------------------------------------
Eric E Monson
Duke Visualization Technology Group


On Nov 4, 2010, at 4:52 PM, Jenya Burstein wrote:

> Hello,
>  
> I am having a difficulty of retrieving a pedigree array from a filter's output.
>  
>   m_tableToPolyData->GetOutput()->GetAttributes(vtkDataObject::POINT)->SetPedigreeIds(
>       m_tableToPolyData->GetOutput()->GetPointData()->GetAbstractArray(0));
>   vtkSmartPointer<vtkClipPolyData> anotherFilter = vtkSmartPointer<vtkClipPolyData>::New();
>   anotherFilter->SetInputConnection(m_tableToPolyData->GetOutputPort());
>   anotherFilter->Update();
>  
>   vtkAbstractArray* origPedigreeIds = m_tableToPolyData->GetOutput()->GetAttributes(vtkDataObject::POINT)->GetPedigreeIds();
>   //origPedigreeIds comes back correctly.
>   vtkAbstractArray* pedigreeIds = anotherFilter->GetOutput()->GetAttributes(vtkDataObject::POINT)->GetPedigreeIds();
>   //pedigreeIds comes back as NULL
>  
> Any help is greatly appreciated,
> Jenya
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