[vtkusers] Picking points from (multiple) vtkStructuredGrids using vtkPointPicker

[da xu]

Hey all,
My question is regarding the vtkPointPicker class. I'm trying to use it to
pick some points from my window (which consists of a few
vtkStructuredGrids). It works fine, returning the Index of the point picked
of some vtkStructuredGrid, but how can I also know which vtkStructuredGrid I
picked from? I tried to use the vtkPointPicker->GetDataSet() method, but the
return dataset was not ANY of the vtkStructuredGrids I had on my render
window. Is there another class I can use?

Thanks!
Will
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