scott wrote:
>> Oh, I see. You're only computing the Z ordinate of the cross product? 
> 
> Well the other 2 ordinates are always zero, so there seems little point :-)

...that's true, of course. I had it in my head that you would only 
compute the X and Y ordinates (which would take *more* effort than a 
simple dot product). But, of course, that would be pointless.

I should go sit in the corner now. :'{

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