Sebastian H. wrote:
> 
> There's a problem with the PARAM_* used in the square roots.
> Actually they are the distance from the "inner box" and must
> be redefined as such before with the code you dropped.
> (Abusing the parameters for this is a bit ugly, but...)
> 
>   PARAM_X = x3 - x2;
>   PARAM_Y = y3 - y2;
>   PARAM_Z = z3 - z2;

As said - i did not yet test it.

> The addition of the square roots with reduced argument number looks good
> though I'm not sure whether by the third one anything is gained.
> It's one additional comparison to maybe save one multiplication and
> one addition.

Well - the most important reason is to maintain the beauty of symmetry 
in the code... ;-)

Christoph

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