Wasn't it SharkD who wrote:
>I was thinking of using a giant toroidal lens around the entire scene. 
>Nearby objects would lie inside the torus and would not be refracted. 
>Distant objects would lie outside the torus and would be refracted. Not 
>sure what exact shape the lens should be. My optics is a bit rusty from 
>high school...

It might be worth trying placing the camera and nearby objects inside a 
spherical lens, and giving that lens an IOR less than 1.0.

-- 
Mike Williams
Gentleman of Leisure

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