wetness

uniform float wetness;

This uniform outputs the current strength of rain and is non-zero when there is currently a rain storm (e.g. weather set rain). The value ranges between 0 to 1 where 0 means no rain and 1 means rain storm, the value is interpolated between those values during transitions in weather. The transition is significantly slower, and can be controlled with wetnessHalfLife.

See also - rainStrength