i think the official docs tell us to use fog type two, specify the
height, below which (usually) the fog is constant and to set an altitude
where the fog fades to zero.  to get the effect you want, you have to
also use the up vector in fog and set it to -1*y.  then set fog_offset
to 12, and fog_alt to 0.  that should create a fog that is constant
above 12, and fades to zero at 0. or, you can make a really big hollow
box and fill it with media.

Andre wrote:
> 
> try an altitide of 12 or 14...
> 
> the y*12 is just saying which way is up (i think)
> 
> Good Luck
> Andre

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