Ambient light level (0-1). Base light level for the scene.
Fog density (0-1). Affects atmospheric scattering depth.
Star visibility (0-1). 0 = hidden, 1 = fully visible.
Sun angle in degrees (0 = horizon, 90 = zenith/noon, 180 = sunset).
Sun intensity (0-1). 0 = night, 1 = maximum brightness.
State representing the time of day and atmospheric light levels.