[Paraview-developers] MultiBlockDataSet rendering error with parallel Paraview

[Prashant V]

Hi,

I am relatively new to paraview and developing a co-processing framework for a client.
I am facing problem when running paraview in parallel mode.

I have developed a paraview source plugin which collects data from each iteration of solver simulation and renders in paraview.
When simulation is run in parallel mode with n processes, source plugin collects n multiBlockDataSets.
If paraview is also running in parallel mode with n processes, source plugin code assigns one multiblock to each paraview process.
However rendering fails in this scenario with error message:

'vtkMultiBlockDataSet (0x1860afe0): Structure does not match. You must use CopyStructure before calling this method'

While exploring this error, some old paraview e-mails suggested to apply d3 filter to each dataset.

I applied d3 filter to each multiblock as below:

VTK_CREATE(vtkDistributedDataFilter, d3);

d3->AddInputData(multiblock);
d3->UpdateInformation();
exec = static_cast<vtkStreamingDemandDrivenPipeline*>(d3->GetExecutive());
exec->SetUpdateExtent(exec->GetOutputInformation(), piece, numPieces, 1); // 1 -> ghostlevel
d3->Update();

newMultiBlock->ShallowCopy(d3->GetOutput());


However this leads to new set of errors:

vtkPKdTree (0xea7b440): (process 0) VolumeBounds - degenerate volume
vtkDistributedDataFilter (0xe7b6480): Unable to build k-d tree structure
vtkDistributedDataFilter (0xe7b6480): vtkDistributedDataFilter::Execute k-d tree failure

Can anyone advice here what could be going wrong? MultiBlockDataSets render perfectly with sequential run of paraview.

Thanks,
Prashant
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