Vincent Le Chevalier wrote:

> if (++depth>5) {if (erand48(Xi)<p) f=f*(1/p); else return obj.e;}

Ouch. This isn't going to be pretty...

> I think it's part of the Russian Roulette method (which is what the 
> comment R.R. stands for I suppose). I don't remember the details but you 
> can probably look it up by yourself...

Clearly it flips a coin to decide whether to process further [all of the 
code paths beyond this point involve sending out a new ray] or just stop 
here. However, "f" is the object colour, and I have absolutely no idea 
why it's being scaled by the reciprocol of the brightest component...

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