[vtkusers] updated image from vtkImagePlaneWidget

[ljp19890525]

Hi all,
I've got an orthogonal rendering of some 3D data with three vtkImagePlaneWidgets.  I can drag the 3  vtkImagePlaneWidgets along axis.  I'd like to be able to display each plane as a separate 2D image which would get updated as the corresponding plane widget is altered (if the slice index is changed, for instance). i know I should USE the AddObserver(vtkCommand::InteractionEvent,mycallback) for the  vtkImagePlaneWidget. But how to define  the mycallback???
Many thanks !



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