[vtkusers] Interaction with opacityTransferFunction

[Douglas Summers-Stay]

I would like to be able to change my opacityTransferFunction 
interactively, by pressing keys on the keyboard.  How can I do this? I 
believe I should be adding an observer and overriding the execute() 
command, but the details of it have eluded me. My application is written 
in C++. 
The application loads a volume texture into memory and displays it using 
vtkVolumeTextureMapper2D.  I want to be able to rotate it, change the 
opacityTransferFunction to the next one I have defined by pressing "[", 
rotate it some more, change the function again, and so forth.  Is there an 
example program that does something like this? 

Douglas Summers Stay
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