But also small translation (or jittering) of the sphere would involve
a complete check of all other spheres if I don't do anything else...
Maybe I could (after I detected some collisions) save the nearest ones
and only check these ones ...

But I found a problem in my other approach. Does POV-Ray support some-
thing like chained-lists efficiently ? I don't know, how to find out,
if I have a given box, which of my thousands spheres are in that very
one box.

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