Due to the size differences involved, it's not practical (AFAIK) to 
model the curvature of the Earth in scenes with objects as small as a 
person. However, I was theorizing that it might be possible to fake the 
curvature by surrounding the scene (a few thousands of meters) with a 
"lens" of a precise shape. I was wondering, is this actually feasible? 
If so, what shape of a lens should I use? How will this affect rendering 
time?

-Mike

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