"Amir_ni" <nomail@nomail> wrote:
> Hi,
>
> I am trying to make a special shape in povray that is made by spheres, but
> neither "intersection" nor "difference" commands cannot help me. This is the
> problem: if the position of eight spheres are in a cubic form in a way that the
> distance between neighbor sphere is less than 1.4 times the radius of spheres, a
> cavity is formed in the center of cube. I want to make the shape of that cavity.

By the way, you already have a cavity when the distance is less than 1.73 times
the radius (sqrt(3)), because the distance from the center of a sphere to the
center of the cavity is sqrt(r^2 + r^2 + r^2). You have three dimensions here.

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