This time I've combined two spheres - one for the reflection (blurrier 
in the middle, sharper at the edges) and one for the refraction (sharp 
in the middle, blurry at the edges).

Currently it just has a linear interpolation of blurriness between the 
center and the edge, but that should be easy to change to angle^2 (or 
something even more aggressive like tan(angle)^2/2.5 or tan(angle)^3/4).

Comments? Opinions?

Cheers,
Edouard.

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