OptionalgroundOptionalhorizonControls the angular width (in elevation) of the horizon blend band.
Larger values give a wider, softer transition. Default is 0.15.
OptionalhorizonHorizon color. Default is a light hazy blue.
OptionalskySky zenith color. Default is a medium blue.
OptionalsunAngular diameter of the sun disc in degrees. Default is 3.0.
OptionalsunSun disc and corona color. Default is warm yellow-white.
OptionalsunWorld-space direction toward the sun (need not be normalized). Default is [0.577, 0.577, 0.577].
OptionalsunWhether to render a sun disc and glow. Default is true.
OptionalsunPeak intensity of the sun glow. Default is 0.25.
OptionalsunExponent controlling how tightly the glow hugs the sun disc. Higher = tighter. Default is 16.
OptionalworldWorld-space "up" direction. Defaults to Z-up [0,0,1] to match the Scene default.
Below-horizon color. Default is a dark earthy tone.