[Paraview] TransformFilter problems

[Paul Edwards]

I've added the SetExecutable call in there and it has got rid of the
first two errors, but it still says:

8<----------------------------------------------------------
Warning: In /home/paul/workspace/ParaView3/VTK/Filtering/vtkDataObject.cxx,
line 908
vtkMultiBlockDataSet (0x1727c50): Attempted to ShallowCopy from null.
---------------------------------------------------------->8

BTW Here is my modified requestData:

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();

       vtkSmartPointer<vtkCompositeDataPipeline> pipeline =
vtkSmartPointer<vtkCompositeDataPipeline>::New();
       transform->SetExecutive(pipeline);

       transform->SetInput(reader->GetOutput());
       transform->Update();
       output->ShallowCopy(transform->GetOutput());
       return 1;
}
---------------------------------------------------------->8

Regards,
Paul

2008/6/10 David E DeMarle <dave.demarle at kitware.com>:
> 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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>