Nekar Xenos <go_### [at] yahoocom> wrote:
> 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.

  If there is an object inside that sphere, how would you calculate where
this curved line intersects that object?

-- 
                                                          - Warp

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