animating large amount of cylindrical vectors

[Jody Winston]

pahsieh at usgs.gov writes:
 > 
 > > Well, I'm having problems with extracting extents.  When I extract
 > > some data using vtkStructuredGridGeometryFilter() and then try to
 > > display it, I only have points.  So, I thought to myself, why I need
 > 
 > I think the filter that you want is not vtkStructuredGridGeometryFilter,
 > but vtkExtractGrid.
 > 
 > Paul
 > 
 > 

That fixes my problem, thanks:

The code was changed to:

    grid = vtkExtractGrid()
    grid.SetInput(sgrid)
    grid.SetVOI(0, shots,
                0, shots,
                0, 4)
    mapper = vtkDataSetMapper()
    mapper.SetInput(grid.GetOutput())

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