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On Wed, 20 Nov 2002 23:55:37 +0100
"Philippe Debar" <phd### [at] wanadoo be> wrote:
> I am not sure about al : it surely isn't the surface of the area
Yes, it's badly commented... it tries to be sqrt(sqrt(area)).
> you could have problem with square roots of negative numbers (you can
> fix that with abs, but there are several different ways to do that and
> they would produce quite different results, so...).
I do not expect negative numbers on area light vectors!
> #local al=vlength(ala1)*vlength(ala2);
Thanks! ...my maths are really poor.
> #local al=vlength(vdot(ala1,ala2));
Hmmm... sorry, as I said my maths are really bad: I can understand
the prior form (vlength*vlength), but this one scapes me, and gives
always 0. There is a typo?
--
Jaime Vives Piqueres
La Persistencia de la Ignorancia
http://www.ignorancia.org
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