Michael Andrews wrote:
> 
> Hi Christoph,
> 
> The cos-theta distribution on the hemisphere is given by creating an
> even distribution on a unit circle and then projecting up or down to a
> unit hemisphere.
> 
> [...]

It is fairly possible that this is the method how the directions array was
originally created but there is no way how to prove this.

Another method (which probably produces higher quality for a fixed number
of rays if done well) would be a repulsion algorithm with a non uniform
force field (i.e. higher repulsive forces between the points at low angle)

Christoph

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