[vtkusers] Finding position on Actor

Lim, Theodore T.Lim at hw.ac.uk
Fri Jun 24 11:41:45 EDT 2005

Is there a function to find out if a position (or point) is lying inside, outside or on an Actor?
What i have is a pick position in world coords (obtained from a Haptic device) which is then converted to display coords to enable picking. I am picking an Assembly which contains several Actors and want to identify a particular Actor so that i can interact with it. 
I would like to determine if the pick position lies on the surface of the Actor.
Please advice.
Many thanks,
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