A new fog system that you could customize in more ways like the new particle system. Some things that could be added and improved:
>>>Fog actually appears against the skybox, rather than only bricks
>Opacity level
>Ability to make the fog look as if it's being moved by wind
>Hue can fade from one color to another
>Fog blends better with bricks
>>>Fog actually moves around objects and stays outside of buildings
>Ability to have the fog come and go randomly from different directions
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