[vtkusers] Picking

[Shyam Prakash]

Hi,
            I define a plane "pl" with normal "n" and origin "o". Now I
want to pick the point "pt" from my vtkRenderer (which has few actors)
such that if I shoot a ray from "o" perpendicular to plane "pl", "pt" is
the first point hit by the ray. I want to do this programmatically;
hence no user interaction is available. Can you please tell me how I can
achieve this. 
 
Thanks
Shyam
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