"alphaQuad" <alp### [at] earthlinknet> wrote:
> Why does Mike say this is the function for a gravity well?
> x*x - 0.002/y*y + z*z

Because he forgot parentheses. That expression simplifies to x*x-0.002+z*z,
which is a circle for every y, so a cylinder. Try x*x-0.002/(y*y)+z*z

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