[Paraview] TransformFilter problems

[David E DeMarle]

Try setting transform's Executive to a new instance of
vtkCompositeDataPipeline. I suspect that the default executive created
for the algorithm is a vtkStreamingDemandDrivenPipeline, which does
not know how to iterate over all of the blocks.

cheers,
Dave DeMarle


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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