[vtkusers] Partitioning Data

[Terry Jordan]

I am trying to partition a unstructured grid into 4 evenly sized pieces.  Currently I am doing the following:
 
vtkXMLPUnstructuredGridWriter *writer = vtkXMLPUnstructuredGridWriter::New();
writer->SetInput( filteredGrid );
writer->SetFileName(vtkFilename);
writer->SetNumberOfPieces( 4 );
writer->SetStartPiece(0);
writer->SetEndPiece(3);
writer->Write();
 
filteredGrid is a vtkUnstructuredGrid
 
The result of this code is 4 copies of the data (1 pvtu and 4 vtu).  Each is identical to the original data.  What am I missing?  I am running this code on a single cpu without the use of MPI.  Do I have to use MPI?
 
Thanks in advance.
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