[vtkusers] trackball interface

[Louis Desjardins]

Hello,

Does anyone have a trackball interface already made?  I have a Logitech 
trackball which I need to incorporate in my application (not as a pointing 
device, but moreso to control how my image changes as the trackball is moved 
up down or left right)
If there's one already implemented this would save me a great deal of 
time..!
Thank you
LD

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