> On a single scene, it may likely range from a slightly sub-millimeter 
> scale (details of everyday objects) to some hundreds of millions of km 
> (planets in solar system), that is around 10^-7 to 10^9 in povray units.
> I'm afraid that it wont work for the larger scales, and so that I'll 
> have to cheat somehow (rescaling planets and putting them closer, 
> maybe). But I wasn't expecting problems around 10-3.

You can't mix km with mm in a single scene, at least not without 
modifying POV-Ray to use arbitrary-precision floating-point numbers 
(probably quite a rewrite, and would really slow things down).

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