[vtkusers] Interactive light position

[Shyam Prakash]

Hi,
            I am trying to implement interactive light positioning. I
have two render windows, one contains a Sphere and a 2d image(window1)
and other contains my actual 3d object(window2). Based on the position
of the 2d image in window1, I want to set the position of the light in
window2. Can some body please suggest me a way of synchronizing two
light sources(How do I calculate the position and focal point of the
light in window2 based on the position of light in window1). 
 
Thanks
Shyam
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