[vtkusers] light position

[Shyam Prakash]

Hello,
            I am using a widget(an image) to control the position of the
light. Based on the position of this image(x and y screen coordinates) I
would like to calculate the position and focal point of the light. Does
any body have an idea how can I achieve this? Any suggestions will be of
great help.
 
Thanks
Shyam
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