VIS-GroundFog is a simple to use system to add some volume-looking animated ground fog to your scenes.
Now approved for Unity 4.x
The system works on plane undergrounds and Unity terrains.
The package contains some example scenes that show:
-Daylight fog
-Mystic glowing night fog
-Sandstorm
Manuals are also included in the package.
The performance and the number of drawcalls of the system depends on the input parameters and can be configured as needed.
See the example
video.