Christoph Hormann wrote:
> Because it uses a fixed table for the sample directions.  If you know a
> way for generating an arbitrary number of sample directions on the fly
> with random yet uniform distribution (and cos theta density distribution)
> you are welcome to share it... ;-)

Actually, that's easy, if I understand the question correctly: let (x, y) be
a random point in the unit circle (x^2 + y^2 <= 1), and let z = sqrt(1 -
x^2 - y^2).

Anders

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