"Warp" <war### [at] tagpovrayorg> wrote in message 
news:43fb7e4b@news.povray.org...
>  If there is an object inside that sphere, how would you calculate where
> this curved line intersects that object?
>

How about taking the ray on a circular path in one direction as the ior goes 
up and changing the direction when the ior goes down resulting in an 
s-shaped path.

-Nekar Xenos-

-- 
"The truth is out there..."

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