Invisible wrote:
>> 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?


One unbiased way is to do it like this:

R = randomNumber(0...1)

if(R < diffuseProb)
   //Do diffuse stuff and return the traced value;
else
   return 0; //So it got absorbed.

So if diffuseProb is (say) 0.9. You have 10% probability that a ray
stops bouncing anymore. This methods let's you still trace to unlimited
depth without the need to specify max trace depth.

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