Tom Melly wrote:

> I'm looking for 3d functions and images of the results of those functions -
> anyone know a good link?
>
> The sort of thing I'm after is z = x^2 + y^2

If you want to render those functions you might try the parametric surfaces
available in MegaPOV
-something like
parametric{
function u ,  v, u^2+ v^2
0 , 1
-1,1
}

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