Comment 6 for bug 550912

(The first report was about syntax error in source, so this is really a different issue. Anyway)

a is side of the equilateral triangle. In the xy plane, spheres are laid in rows parallel with x. Distance of these rows is hy=a*sqrt(3)/2. In the z direction, the planes need to assume distance equal to height of equilateral terahedron with side a. This height is hz=a*sqrt(6)/3. This is also what is in the code. Did I overlook something?