> 
>> 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!

In many internal calculations of POV-Ray, numbers will get *squared*. 
That's reason why there are inaccuracies even with ranges that don't 
seem so high.

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