clipka wrote:
> Distribution over a hemisphere is not enough for radiosity. There needs to be a
> particular bias towards the "zenith".

Do it like I do:

1. Choose a random point on a disc. (You can do this quickly by first
choosing a random point on square and then check if it is inside a circle).
2. Project it on a hemisphere.

Voila! There you have a cosine weighted random point on a hemishpere. No
need to do the cosine weighting anymore.

That is the method I use in ssRay. With 1600+ samples they are very well
distributed with a decent PRNG. If not you can try Halton sequence or
something similar to generate a more even distribution.

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