Overlays two kinds of fog onto the scene: distance-based fog which gets thicker as you get further from the camera, and height-based fog which operates on world height.

Parameters

Distance-based Fog

• Distance Strength - Visual strength of the distance-based fog.
• Start Distance - The distance from the camera at which distance-fog starts appearing.
• Start Distance Color - Color of the distance-fog at the Start Distance.
• Full Strength Distance - The distance from the camera at which distance-fog is at maximum strength.
• Full Strength Distance Color - Color of the distance-fog at the Full Strength Distance.
• Distance Falloff - Controls the color curve between the Start and Full Strength Distances.

Height-based Fog

• Height Strength - Visual strength of the height-based fog.
• Start Height - The height in world space at which height-fog starts appearing.
• Start Height Color - Color of the height-fog at the Start Height.
• Full Strength Height - The height in world space at which height-fog is at maximum strength. Note that if this value is lower than start height, the fog gets stronger as height drops, and vice versa.
• Full Strength Height Color - Color of the height-fog at the Full Strength Height.
• Use Fog At Skybox - Should the fog be visible at the skybox?
• Skybox Height - A modified height value to use at the skybox. For all distances between Full Strength Distance and the skybox distance, the shader will interpolate between Full Strength Height and Skybox Height. This ensures a smooth gradient transition between both fog values at the skybox, so I recommend making this value much lower than Full Strength Height.
• Height Falloff - Controls the color curve between the Start and Full Strength Heights.