Keyframes Layers trueSKY Actor

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Precipitation

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.

Variable Definition Value
Regional Whether rain/snow falls only in specified region, or globally. Bool.
Wind affects position If the wind should affect the regional area. Bool.
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
Strength Amount of rain/snow. 0.0 to 1.0
Rain Streaks Visual strength of rain streak effect. 0.0 to 1.0
Variable Definition Value
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
Waver 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
Variable Definition Value
Rain Cubemap Cubemap to be used to light the Rain Cubemap
Velocity Streaks If the raindrop shape is altered by their velocity. Bool
Simulation Time If time progression should be taken into account for rain fall. Bool
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