Nieminen Juha wrote:

>   You should have told that it's the dot-product of the two vectors. It's
> always a good idea to tell where does a formula come from for further
> reference.

Your right, I should have and I will try to do so more in the future.  I
actually got the formula by thinking of the inside/outside test of the
equation a*x+b*y+c*z=0 though.

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