Keyframes Layers trueSKY Actor

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Variable Definition Value
Sea Level Deg. C For infra-red rendering. -273.0 to 1000
Zenith Colour of the Zenith (Sky above you). See Sky Colours RGB
Horizon Colour of the Horizon (Sky around you). See [Sky Colours] RGB
Variable Definition Value
Loop If the sky should loop the first day. The loop can be seen on the timeline, indicated by a yellow bracket above the Sky Layer. Bool
Variable Definition Value
Sky Multiplier Multiplier to scale the brightness of the Sky. 1 to 100


Variable Definition Value
Planet Radius Radius of the planet in meters. 100 to 100000
Atmosphere Thickness Thickness of the Atmosphere in Km. 10 to 1000
Ozone Ozone level of the atmosphere. 0 to 0.2
Emissivity Emissivity of the Atmosphere. 0 to 1
Rayleigh Coefficient Rayleigh scattering coefficients at standard sea level density, xyz = RGB. Can be calculated based on wavelength with Auto Button. 0 to 10000
Variable Definition Value
Atmospherics Amortization How to spread the cost of rendering atmospherics over frames. Similar to Cloud Amortization. 1 to 8


Variable Definition Value
Automatic Sun Position Whether to calculate sun’s position to be Geographically Accurate. Disable to set the position manaully. Bool
Variable Definition Value
Light Wavelength (R,G,B) Wavelength of the light from the sun. 0 to 1000
Irradiance Irradiance of the Sun, in Watts/m2/nm. XYZ=RGB. 0 to 50
Diameter Size of sun’s radius in degrees. 0.0 to 3600.0
Link Keyframe time and daytime See Link Keyframe Time Bool
Time Zone Time Zone based on Greenwich Mean Time (GMT). Between -12.0 and 12.0
Start Date For calculating position of sun/moon. Where 01/01/2000 = 0 , -1 = 31/12/1999, 01/01/2016 = 5844(format DD:MM:YYYY). -100000 to 100000
Variable Definition Value
Sun Multiplier Multiplier to scale the brightness of sunlight in the scene. From 1 to 10
Max Sun Radiance Maximum Sun radiance produced. 0 to 1000000.0
Adjust Sun Radiance If enabled, adjusting the Sun radiance will cause the sun to automatically scale to keep spectral irradiance the same. Bool

Moon (Legacy 4.1 System)

The moon has a customisable texture, so you can use it to make some interesting effects! This is a legacy system found in 4.1a and 4.2 versions of the plugin)

Variable Definition Value
Automatic Moon Position Whether to calculate moon position from date and time. Bool
Variable Definition Value
Albedo The proportion of the incident light that is reflected by a surface. 0.0 to 1.0
Diameter Size of moon’s radius in degrees 0.0 to 3600.0
Colour Colour of the moon. Uses a colour wheel, can also input HTML Colour Code. RGB
Variable Definition Value
Moon texture Texture to use for the Moon. trueSKY has a moon texture by default. .png
Moon Multiplier Brightness multiplier for the Moon. 0.0 to 10.0

Moon (Multi Moon - 4.2a)

This system is found in unreal 4.2a versions and allows for multiple moons and extensive customisation of both the moons and the orbital paths. Find more information and indepth descriptions go here

Variable Definition Value
Name Allows for assigning a name for each Moon within the scene. This help differentiate between multiple Moons. text
Texture 2D Texture to use for the Moon. .png
Name Allows for assigning a name for each Moon within the scene. This help differentiate between multiple Moons. text
Colour Affects the texture of the Moon and the light that is reflected off of it. RGB
Use Preset Allows you to use one of the preset Moon templates. Checking this will cause all your currently setting to be overridden. Bool
Moon Preset Changes all of the settings within the Moon array element to a series of preassigned values. Dropdown
Albedo Controls the proportion of light that is reflected by the Moon. 0.0 to 10.0
Longitude of the Acending Node The points in which the Moon crosses the plane of the equator. 0.0 to 360.0
Longitude of Ascending Node Rate The amount the ascending node increases each day (24 hour period). 0.0 to 10.0
Inclination This controls the tilt angle of the orbit. 0.0 to 360.0
Argument of Pericentre The closest point of that the Moon is to the Earth’s surface. 0.0 to 360.0
Argument of Pericentre Rate How much the argument of the pericentre changes per day. 0.0 to 10.0
Mean Distance The mean (average) distance the Moon is from the center of the Earth. 0.0 to 100.0
Eccentricity Controls how elliptical the orbit of the Moon will be around the Earth. 0.0 to 1.0
Mean Anomaly The position that the Moon will be around its orbit at midnight of each day. 0.0 to 360.0
Mean Anomaly Rate Controls how much the mean anomaly changes each day. 0.0 to 10.0
Radius Arc Minutes Controls the apparent size of the Moon when visualized from the surface of the Earth. 0.0 to 1000.0


Variable Definition Value
Max Magnitude Maximum Magnitude of stars. 0.0 to 9.0
Brightness Star Brightness. 1.0 to 10000.0
Minimum Pixel Size Minimum size of each star. 1.0 to 10000.0
Background Brightness multiplier for background texture. 0.000001 to 0.001
Find Constellation Out for Repairs Out for Repairs
Variable Definition Value
Cosmic Background Texture Texture to appear for the night sky. Default is an image of the Milky way. .png
Minimum Star Pixel Size Minimum pixel size of stars in the sky. If set to 0 they are drawn as point, otherwise as quads. Does not affect the Sun. 0 to


A keyframe’s haze value determines how much Mie-scattered haze (i.e. mist or fog) is present. Haze is considered to have a density that falls-off exponentially with altitude, so the HazeScaleHeightKm property determines the scaling height for this exponential. TheHazeBaseHeightKm is also used. Below this height, full haze is applied.

Variable Definition Value
Visibility Visibility controls haze/fog, represents visibility at sea level. 0.1 to 10000
Haze/fog Amount of haze/mist. 0.00001 to 1000.0.
Haze Base Base altitude above which haze decreases in density. -2.0 to 20.0.
Haze Scale Vertical scale over which haze reduces with altitude. 0.1 to 10.0.
Eccentricity Anisotropy of Mie scattering. 0.0 to 1.0.
Ground Fog Strength of ground fog. 0.0 to 10.0.
Fog Ceiling Fog Ceiling in Km. 0 to 10.
Mie Coefficients Mie scattering coefficients. XYZ = RGB. 0 to 50