[vtkusers] ImagePlaneWidget

[John Hunter]

I am working with the ImagePlaneWidget.py example and would like to
modify it to include 3 observer windows that show the X, Y, and Z
planes head on.  I am less interested in the logistics of the GUI
windows, than in what the proper VTK entities are that I should be
using so that changes in the position vtk.vtkImagePlaneWidget are
reflected in the slice windows.  Pointers to examples or suggestions
are welcome.

I'm using VTK 4.2.

John Hunter