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UDK iOS Fog Issues.

I'm having trouble getting fog to work properly in the mobile previewer.

The look I'm going for is quite simple. Imagine a city on top of a tall hill. It's sunny on top, and the hill pokes through a dense fog, so you can't see the bottom of the hill. I want the impression that it's a hill top poking through a cloud, allowing the city to receive direct sunlight.

I'm using UDK Feb 2013 beta. First I tried using Height fog and Fog Volume in separate occasions. Both were unhidden and the densities jacked way up to test fog visibility. Neither would work in the mobile preview.

I read that if you go to VIEW > World Properites > Mobile you can enable mobile fog. I could finally see fog in my Mobile Preview. However, this does NOT activate the HeightFog or FogVolume properties. It simply adds a generic fog with minimal controls, which won't allow me to get the desired effect I want.

Has anyone out there done much with mobile fog in UDK, that might know how to get this effect i'm looking for? I've been working on this for weeks!!! Any help would be most appreciated!
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