Darren New wrote:

> Cute. Hard to read, but cute. :-)

Wait... THE WALLS ARE GIANT SPHERES?! o_O

Well that's *one* way to cut down the code size... No ray/plane 
intersection test to code.

44:  double n=sizeof(spheres)/sizeof(Sphere);

Well... that's... one way to figure out how big an array is. :-.

Evidently my C++ is weak, but... how is

53:  Vec nl=n.dot(r.d)<0?n:n*-1;

different from "nl = -abs(n.dot(r.d))"?

Also, where THE HELL is "Xi" defined? I can see it *used* in several 
places, but I can't find a definitions.

Line 79 means each row of pixels is computed in parallel, right?

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