>> And increase X until the sphere disappears, on my system X=2e7 doesn't
>> render.
>
>  AFAIK that's not because of precision, but because of an explicit limit
> in the source code for such things.

Is the purpose of the explicit limit to hide precision errors becoming 
visible?

Why is the limit so low, 2e7 is absolutely tiny compared to the 64-bit 
floating point range of 1e300 or whatever it is (which presumably POV uses).

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