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Thomas -- you mentioned using a mesh lens... I would think using an formula would give you a much nicer result
I just tried it and it seems to work great -- take two formula objects with the following formula:
x=(v-0.5));
y=(u-0.5) ;
r=sqrt(x*x+y*y);
z=(-(cos(r) * 0.6)+0.5);
Flip one of them to be opposite of the other such that the concave sides face outwards -- give them both glass shaders, and position them in front of your camera.
John
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