Warp wrote:
> 
>   I think that the function is defined so that everything point for which
> f(x,y,z) < 0 is inside the surface while every point for which f(x,y,z) > 0
> is outside the surface.

Yes, and you can easily switch the orientation of an isosurface with "sign -1"

-- 
Margus Ramst

Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg

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