[vtkusers] Multiple pieces in one unstructuredgrid

[Mikael Öhman]

Hi.

I can't figure out how to add several pieces to a single
vtkUnstructuredGrid.
I want to achieve
<UnstructuredGrid>
<Piece ...> </Piece>
<Piece ...> </Piece>
</UnstructuredGrid>

I can see that vtkUnstructuredGrid has a function GetNumberOfPieces(),
which suggest to me that this is actually possible with unstructured grids
somehow, but I can't find any way to do *anything* w.r.t pieces.
How do I do it?

Regards, Mikael
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