[Paraview] TransformFilter problems

[Berk Geveci]

Can you post the source code for the transform filter? It is somehow
failing (returning 0) during RequestDataObject() (which may be in the
superclass). Do you have that method implemented by any chance?

-berk

On Tue, Jun 10, 2008 at 8:06 AM, Paul Edwards <paul.m.edwards at gmail.com> wrote:
> I am trying to use a subclass of TransformFilter in one other Filters
> (subclass of vtkMultiBlockDataSetAlgorithm) in the RequestData method.
>  The RequestData looks like this:
>
> 8<----------------------------------------------------------
> int vtkFilter::RequestData(vtkInformation* info,
>                vtkInformationVector** vector,
>                vtkInformationVector* outputVector)
> {
>        vtkInformation* outInfo = outputVector->GetInformationObject(0);
>        vtkMultiBlockDataSet* output = vtkMultiBlockDataSet::SafeDownCast(
>            outInfo0->Get(vtkMultiBlockDataSet::DATA_OBJECT()));
>
>        vtkSmartPointer<vtkMyMultiBlockDataSetReader> reader =
> vtkSmartPointer<vtkMyMultiBlockDataSetReader>::New();
>        // setup reader here...
>        // .....
>        vtkSmartPointer<vtkXYZTransformFilter> transform =
> vtkSmartPointer<vtkXYZTransformFilter>::New();
>        transform->SetInput(reader->GetOutput());
>        transform->Update();
>        output->ShallowCopy(transform->GetOutput());
>        return 1;
> }
> ---------------------------------------------------------->8
>
> This filter above will work without the transform and the transform
> works as a filter in paraview but when I have it as above I get the
> following error:
>
> 8<----------------------------------------------------------
> ERROR: In /home/paul/workspace/ParaView3/VTK/Filtering/vtkExecutive.cxx,
> line 757
> vtkStreamingDemandDrivenPipeline (0x4a7b1b0): Algorithm
> vtkXYZTransformFilter(0x4a0c7a0) returned failure for request:
> vtkInformation (0x4a7a9a0)
>  Debug: Off
>  Modified Time: 202678
>  Reference Count: 1
>  Registered Events: (none)
>  Request: REQUEST_DATA_OBJECT
>  FORWARD_DIRECTION: 0
>  FROM_OUTPUT_PORT: 0
>  ALGORITHM_AFTER_FORWARD: 1
>
> ERROR: In /home/paul/workspace/ParaView3/VTK/Filtering/vtkExecutive.cxx,
> line 757
> vtkStreamingDemandDrivenPipeline (0x4a7b1b0): Algorithm
> vtkXYZTransformFilter(0x4a0c7a0) returned failure for request:
> vtkInformation (0x4a7a9a0)
>  Debug: Off
>  Modified Time: 202710
>  Reference Count: 1
>  Registered Events: (none)
>  Request: REQUEST_DATA_OBJECT
>  FORWARD_DIRECTION: 0
>  FROM_OUTPUT_PORT: 0
>  ALGORITHM_AFTER_FORWARD: 1
>
> Warning: In /home/paul/workspace/ParaView3/VTK/Filtering/vtkDataObject.cxx,
> line 908
> vtkMultiBlockDataSet (0x173da00): Attempted to ShallowCopy from null.
> ---------------------------------------------------------->8
>
> Can anyone see what I am doing wrong?
>
> Thanks in advance,
> Paul
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