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Is this a go?
It may have been dodgy to try to push this as a bugfix, but I strongly
think it warrants a doc clarification.
"Greg M. Johnson" wrote:
> Add somewhere after the fog equation is written:
>
> Note that for this equation, a distance of zero is undefined. In
> practice, povray will treat this value as "fog is off". To use an
> extremely thick fog, use a small nonzero number such as 1e-6 or 1e-10.
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