Keyframes Layers trueSKY Actor

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Variable Definition Value
Brightness Power Adjusts light levels to compensate for variations via power function (e.g 0.5 = square root dependence, 1.0 = no adjustment). 0.01 to 1.0
Altitude Higher Altitude, less atmosphere. Will allow more light to pass through. 1 to 8
Max Altitude Max altitude that will be used for fade and sky colour calculations, in km. 2.0 and 100.0
Elevations Number of elevations / height of table. Powers of 2 between 4 and 256.
Distances Number of distances / width of table. Powers of 2 between 4 and 128.
Distance Range Maximum distance for fade. 5.0 and 2000.0.
Variable Definition Value
Light source Which directional light source trueSKY should control Directional Light
Drive Light Direction If trueSKY should alter the angle of the Directional Light based on the movement of the Sun and Moon. Bool
Light Units Radiometric or Photometric Light Units. Only use Photometric if you Unreal’s Exposure settings.Light Units Radiometric or Photometric
Brightness A Brightness Multiplier applied to the Sun, Moon and Sky. 0.1 to 10.0
Gamma Gamma adjustment value. 0.0 to 10.0
Direct Light Amount of direct light on the clouds. 0.0 to 4.0
Indirect Light Amount of indirect light on the clouds. 0.0 to 4.0
Ambient Light Amount of ambient light on the clouds. 0.0 to 4.0
Extinction Amount of light scattered per metre (larger values = darker clouds). 0.0001 to 10.0
Mie Asymmetry Anisotropic distribution of direct lighting, or eccentricity. 0.0 to 1.0

trueSKY Light

This applies a constant ambient light over the whole scene. Check out Unreal’s SkyLight for information on most of the variables. This will just cover any variables we have added.

Variable Definition Value
Update Frequency How often the trueSKYLight will update, in frames. 1 means every frame, two mean every other frame etc. 1 to 100
Blend How much to blend new updates with previous values. 0 to 1
Amortization How much to Amortize rendering. 1 to 8
All Faces Whether to fill all cube maps faces on every update. Bool
All Mips Whether to fill all mipmaps on every update. Bool
Diffuse Multiplier Multiplier for the diffuse illumination from the skylight. 0.0 to 20.0
Specular Multiplier Multiplier for the specular reflections from the skylight. 0.0 to 20.0
Gamma Correction Gamma adjustment to apply. 0.0 to 20.0