If I'm not mistaken, when creating a VTK pipeline inside of a PV filter,
you need to make a shallow copy of the input dataset in order to keep
the PV pipeline isolated as your VTK pipeline executes.
Try making a shallow copy of "input" and passing that into
"extractBlockFilter", and see if it helps.
Burlen
Paul Edwards wrote:
Hi,
I am writing an algorithm to operate on a vtkMultiBlockDataSet where I
would like to extract blocks depending on field data that is set.
Internally in my algorithm I am using the vtkExtractBlock filter and
when this is updated it causes the RequestData for my reader to be
executed again. This doesn't happen when applying ExtractBlock in
ParaView. Below I have included an example RequestData that causes
the data to be reloaded (note: this only happens when running in
parallel):
8<-----------------------------------------------------------------
int vtkTestMulti::RequestData(
vtkInformation* vtkNotUsed(request),
vtkInformationVector** inputVector,
vtkInformationVector* outputVector)
{
vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
vtkMultiBlockDataSet* input = vtkMultiBlockDataSet::SafeDownCast(
inInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkInformation* outInfo = outputVector->GetInformationObject(0);
vtkMultiBlockDataSet* output = vtkMultiBlockDataSet::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
VTK_CREATE(vtkExtractBlock, extractBlockFilter);
extractBlockFilter->SetInput(input);
extractBlockFilter->AddIndex(1);
extractBlockFilter->Update();
output->ShallowCopy(extractBlockFilter->GetOutput());
return 1;
}
----------------------------------------------------------------->8
Can anyone see what I am doing wrong or provide any pointers for where to look?
Thanks in advance,
Paul
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