> I have no idea if POV-Ray handles what used to be called 
> 'persistant variables' or not.
MegaPOV 0.7 supported them IMHO. But you can simulate them without 
problems, using File I/O. That's the way most particle systems do it 
(e.g. Rune's). If you do not want to reinvent the wheel, you can take a 
look at Tim Nikias' I/O Macros which can be found at 
http://www.nolights.de/download.html#IO-Macros

HTH,
Florian

P.S.: You hopefully know that the only reason I'm telling you this is 
that I really want to see this great image animated ;)

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