> > 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.
> [...]
> 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)

I do not see why the quality is better than using repulsion
inside the unit circle with a uniform force field before projecting.

  Mark

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