Warp wrote:
> You can test wether a point is inside or outside the object, but you
> can't test if it's exactly on the surface.

Er, if you can test if a point is inside or outside the object, you
can test if it's exactly on the surface (i.e. point is neither
inside nor outside the object, or both, it must be coinciding)

-- 
Tim Cook
http://empyrean.scifi-fantasy.com

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