For something like that, Nerd's Fog Tool is probably best. You can also try my free Fog plane, it's in Free Stuff.. WAYYY back. You could probably make something better with a few planes and ome procedurals nowadays. Same principle though :) - some semi-transparent planes. Much easier to control than the atmospherics in Poser. Those are cool WHEN they work, but it's too often a hit-AND-miss situation IMO L

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.