Is there a fog where would be solid enough to be a settling fog? I remember an option like that in UDK but unreal only has atmospheric and exponential and Ive played with both of them and I cant get a good solid volume to move up and down, if that makes any sense.
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https://www.youtube.com/watch?v=cfTzUwDeUbM
His site is down or gone so you can use this:
http://web.archive.org/web/20130510011917/http://www.chrisalbeluhn.com/UDK_Mist_Fog_Tutorial.html