[vtkusers] [VTKUsers] How to implement Collision Detection by VTK

[Hongsongyang]

Dear All:
    I have 2 separate volume actor in one rendering window, and I could move
each of them by mouse or by funtion.
But how could I implement the Collision Detection in VTK, to make sure if
they have collide with each other during moving, 
they could not be passed through each other. 
 
Thanks a lot.
 
Best regards,
Hong Songyang
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