Precipitation can be attached to any cloud keyframe and will produce rain or snow based on cloud position and thickness.

Rain and snow can be fully customised, from rain speed to snowflake size.

For transparent effects, such as precipitation and lightning to work in Unreal, trueSKYtransluscent needs to be added as a post process material. This should be done automatically. Learn about this here





Whether rain/snow falls only in specified region, or globally.


Wind affects position

If the wind should affect the regional area.


Radius (km)

Radius of precipitation region.

Between 0.1 and 1000

Rain - Snow

How the Precipitation will act. 0 = rain, 1 = snow, values in between will share characteristics.

0.0 to 1.0


Amount of rain/snow.

0.0 to 1.0

Rain Streaks

Visual strength of rain streak effect.

0.0 to 1.0




Max Particles

The maximum number of rain particles to render.

0 to 1000000

Radius (metres)

Size of particle zone. Higher values allow you to render precipitation at greater distances

0.0 to 100.0

Rain Speed (m/s)

Speed at which raindrops will fall.

0.0 to 120.0

Snow Speed (m/s)

Speed at which Snow Flakes will fall.

0.0 to 120.0

Raindrop Size (mm)

Size of each individual Raindrop.

0.001 to 100.0

Snowflake Size (mm)

Size of each individual Snow Flake. Recommended to increase for testing purposes.

0.001 to 100.0


How much precipitation wavers. Waver is how much the rain or snow will sway while falling

0.0 to 1

Waver Time (s)

Intervals between waver. In seconds between

0 to 100

Threshold (km)

Thickness of cloud needed for rainfall. No threshold when set to 0.

0.0 to 10.0

UE4 only




Rain Cubemap

Cubemap to be used to light the Rain


Velocity Streaks

If the raindrop shape is altered by their velocity.


Simulation Time

If time progression should be taken into account for rain fall.


Rain Near Threshold

Draw no rain closer than this distance.

0.01 to 0.5

Rain Mask Scene Capture 2D

2D Screen capture to limit rain below surfaces. Lean more about this here.

Scene Capture 2D

Rain Mask Width

Width of the Rain Mask

100 to 50000

Rain Mask Depth Extent

Height of the Rain Mask

100 to 100000

Translucent RT

The render texture used to render Precipitation effects.

Render Texture