"Physical Starlight and Atmosphere" documentation
User Variables explained:
Sun settings
Azimuth - moves the Star (Sun) horizontally (0)
Elevation - moves the Star (Sun) vertically. Sun is at the zenith at 90° and on the horizon at 0°
Sun Disk - toggles Star (Sun) disk in the sky.
Sun Lamp - toggles Sun lamp in the scene. If disabled, sun disk is used as Sun radiance.
Angular Diameter - Star`s angular diameter in the sky. Larger the diameter, larger the star and brighter it gets.
Temperature K - Star`s color temperature in Kelvins
Intensity - Star`s radiance intensity
Atmosphere settings
Density - Atmospheric density at sea level in kg/m3
Height - Atmosphere height where density is 0.0
Intensity - Atmosphere radiance intensity
Color - Atmosphere (gas) particle color
Inscattering - Atmosphere scattering parameters
Absorption - Atmosphere absorption (color extinction) parameters
Mie Scattering
Intensity - intensity of Mie scattering
Anisotropy - directionality of Mie scattering
Artistic Controls
Distance Scalar - scales the scattering values to increase/decrease apparent scale
Falloff - fog falloff curve
Sun Radiance Gamma - Star`s radiance color gamma (increase/decrease color saturation)
Ground
Ground Albedo - parametric ground plane color
Ground Offset - parametric ground plane offset