[Paraview] Pruned output for extract block

[Paul Edwards]

Utkarsh,

If you do that you will end up with all the empty blocks in the structure.
 I would like to just see the extracted blocks without losing the original
structure.

Regards,
Paul

On 25 February 2010 14:50, Utkarsh Ayachit <utkarsh.ayachit at kitware.com>wrote:

> Paul,
>
> If you don't want the ExtractBlock filter to prune the output, you can
> always simply uncheck the "Prune Output" checkbox.
>
> Utkarsh
>
> On Thu, Feb 18, 2010 at 9:45 AM, Paul Edwards <paul.m.edwards at gmail.com>
> wrote:
> > Hi,
> > What is the reason for pruning the structure in the "Extract Block"
> filter
> > when there is only one child item?  I output the following structure from
> > the custom reader:
> >
> > output (multi-block dataset)
> >
> > zone 1 (multi-block dataset)
> >
> > volume (unstructured grid)
> > boundaries (multi-block dataset)
> >
> > blade (poly data)
> > hub (poly data)
> > case (poly data)
> >
> > zone 2 (multi-block dataset)
> >
> > volume (unstructured grid)
> > boundaries (multi-block dataset)
> >
> > blade (poly data)
> > hub (poly data)
> > case (poly data)
> >
> > If I were to extract both the blades then the resulting structured would
> be:
> >
> > output (multi-block dataset)
> >
> > blade (poly data)
> > blade (poly data)
> >
> > This has now lost all the information from the original structure.
> > Commenting out the section for the case when there is only one child item
> > fixes this for me:
> >
> 8<--------------------------------------------------------------------------------------------------
> > Index: ./VTK/Graphics/vtkExtractBlock.cxx
> > ===================================================================
> > RCS file: /cvsroot/ParaView3/ParaView3/VTK/Graphics/vtkExtractBlock.cxx,v
> > retrieving revision 1.6
> > diff -r1.6 vtkExtractBlock.cxx
> > 239,251c239,251
> > <         vtkMultiBlockDataSet* prunedBlock =
> > vtkMultiBlockDataSet::SafeDownCast(block);
> > <         if (prunedBlock && prunedBlock->GetNumberOfBlocks()==1)
> > <           {
> > <           // shrink redundant branches.
> > <           clone->SetBlock(index, prunedBlock->GetBlock(0));
> > <           if (prunedBlock->HasMetaData(static_cast<unsigned int>(0)))
> > <             {
> > <             clone->GetMetaData(index)->Copy(prunedBlock->GetMetaData(
> > <                 static_cast<unsigned int>(0)));
> > <             }
> > <           }
> > <         else
> > <           {
> > ---
> >> //        vtkMultiBlockDataSet* prunedBlock =
> >> vtkMultiBlockDataSet::SafeDownCast(block);
> >> //        if (prunedBlock && prunedBlock->GetNumberOfBlocks()==1)
> >> //          {
> >> //          // shrink redundant branches.
> >> //          clone->SetBlock(index, prunedBlock->GetBlock(0));
> >> //          if (prunedBlock->HasMetaData(static_cast<unsigned int>(0)))
> >> //            {
> >> //            clone->GetMetaData(index)->Copy(prunedBlock->GetMetaData(
> >> //                static_cast<unsigned int>(0)));
> >> //            }
> >> //          }
> >> //        else
> >> //          {
> > 257c257
> > <           }
> > ---
> >> //          }
> >
> -------------------------------------------------------------------------------------------------->8
> > Could this case be removed in the main CVS or is there a good reason for
> > keeping it?  (maybe an option could be added for it....)
> > Thanks,
> > Paul
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