> The light source is very far away so the light be essentially parallel.
> The result should be an essentially vertical line dividing light and
> dark regardless of diffuse or light. Look at the quarter moon, pictures
> earth from space.
The moon defies the lambertian model because it's exceptionally rough and is covered
with
dust that reflects light in odd directions. Quick solution to your problem
finish {ambient 0 diffuse 1 brilliance 0}
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