Severi Salminen wrote:
>> Right. So trace rays, let them bounce off diffuse surfaces at
>> semi-random angles, and gradually total up the results for all rays?
> 
> Basically yes. Although there are many ways to reduce the amount of rays needed
> to achieve certain noise level without affecting "unbiasness". The point is
> that the rays keep on going without stopping them artificially.

Right. Well presumably there must be *some* limit on the maximum 
recursion depth though?

>> Presumably that won't work with point-lights though? (You'd never hit any!)
> 
> There are no point light sources in real life. They always have some volume.

Yes indeed...

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