Wasn't it Luiz who wrote:
>Hello everybody,
>
>I wonder if it is possible to somehow get the coordinates of a shadow... let me
>explain:
>
>I build sundials, and povray could be very useful in planning, using sunpos.inc
>which comes with povray. If I, for instance have a sphere floating over a
>plane, would it be possible to get the coordinates of the center of the shadow
>of the sphere on the plane?

You should be able to use trace() to trace a ray:
   to the plane
   from the position of the light source
   in the direction of (sphere centre minus position of light source)

-- 
Mike Williams
Gentleman of Leisure

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