Variables¶
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 |
UE4 only¶
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 |