Hi,



>> 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.

> 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).

Thanks for this info. You mean that a scale range from 1 to 10^6 is too 
much? Seems pretty narrow to me. I'll see!

Thanks,

	Yannick

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