>  If it's an isosurface defined with a function, then you can calculate
>the lowest point using mathematics.


This is not true. Many functions have no algebraic solutions. (Above 5th
order polynomials it's impossible!)

The surface in question is:  x^4 + y ^4 + z^4 - (x^2 + y^2 + z^2) -1 = 0.

This is a fouth order plynomial, and is not easily solved using algebra.. A
numerical methos would be better...

Simen.

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