[vtkusers] Selections

[David Doria]

I am trying to demonstrate vtkSelectionSource and vtkExtractSelection:
http://www.vtk.org/Wiki/VTK/Examples/ExtractSelection

The example is setup to create 50 random points and extract 10 of them (IDs
10 through 20, so maybe 11?). Is this the right idea? Create a
selectionSource, tell it which things you want to select, then extract the
selection?

The output of the extractSelection filter is NULL, so clearly it is not
exactly correct :)

Also, the output of the ExtractSelection is a vtkDataObject, so I tried to
cast it as a vtkDataSet to get back to a sane data type - is this a
reasonable approach? 'obj' is null for now so I can't tell if the cast will
work.

Any suggestions?

Thanks,

David
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