>> 53:  Vec nl=n.dot(r.d)<0?n:n*-1;
>>
>> different from "nl = -abs(n.dot(r.d))"?
> 
> a?b:c evaluates to b if a is true, or c otherwise.

Ah, wait, I misread that as calculating something, assigning it to n, 
and then checking whether n is negative and if not negating it. On 
closer inspection, that's not what this does...

>> Also, where THE HELL is "Xi" defined? I can see it *used* in several 
>> places, but I can't find a definitions.
> 
> Line 82, after the x=0 definition.

Wait - you can define MORE THAN ONE variable in a loop initialisation??

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