> #declare m = 1;
> #declare cm = m/100;
> #declare mm = m/1000;

I strongly suggest to use MUCH larger values if possible; see my
thread "Small is NOT BEAUTIFUL" in p.g, 11 Feb. 2003. Especially
transparency, almost-coincident surfaces and shadows are highly
problematic. For indoor scenes of "normal" scale I suggest to
use 1 POV-unit = 1 mm or less.

   Sputnik


P.S. If the sphere in the second "Small is NOT BEAUTIFUL" demo scene
     is removed, then all errors are reduced by about three orders
     of magnitude -- try with scale 0.004!

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