>   function{
>     pow ( pow(abs(x),Power)
>          +pow(abs(y),Power)
>          +pow(abs(z),Power) , 1/Power ) - Size
>     }


You could also try with superellipsoids; the sphere is a particular one (e =
n = 1, e and n being the parameters stated in the docs) and my guess is
that the cube is a limit one (e = n -> +oo should make it). The advantages
are that of using a built-in object and not having to provide a
max_gradient.
The equation it yields differs slightly from yours, though the extreme
shapes should be the same. Would be interesting to compare the intermediate
shapes it goes through!

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