IMHO, would it not be possible to simulate a sphere of continually 
increasing ior towards its centre? If a ray intersects the sphere close to 
90 degrees to the normal the ior is low because the air is very thin on the 
outside. As the angle of intersection gets closer to the circle's normal the 
ior increases because going towards the centre the ior increases. I think 
this would be the first step in the right direction.

-Nekar Xenos-

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The truth is out there...

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