If it creates a sphere of radius 7, then it's doing what it's supposed to.

It's plugging in the -7 into the equation for a sphere and solving for
interesections. No mathematical problems occur because of this.

There are a lot of places where you can enter numbers that don't make sense
(like negative colors for light sources or transparency greater than 1) that
allow you to create interesting effects.

I think as long as it doesn't cause any calculation issues (like
vnormalize(0,0,0) did), there's no reason to restrict it.

 - Slime
[ http://www.slimeland.com/ ]

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