Atmosphere
GenesisII implements an advanced atmospheric model that realistically reflects the way that light is diffracted and absorbed by our atmosphere. These controls are used to set atmospheric and environmental effects - see also the Clouds controls.

Atmospheric Effects

• Direct Light: Controls the intensity of direct sunlight, this creates highlights and shadows.
• Background Light: This is sunlight that has been scattered by the scene and comes from all directions. Does not create highlights.
• Atmospheric Scatter: Controls how much the direct sunlight is scattered to form the blue of the sky.
• Atmospheric Glow: This causes simple atmospheric haze. Also controls the glare around the sun from haze and clouds.
• Shadow Depth: Controls how dark cast shadows are.
• Mist Density: General atmospheric mist/haze. Also increase glow around the sun if at sufficient height.
• Mist Height: Defines the top of the mist level as a proportion between atmosphere floor and ceiling. The mist top is not a sharply defined boundary but fades in a realistic manner.

Colors

• Sun: The color of the sun. Usually this is set to white or a very light yellow, but can be set to redder tones for sunsets.
• Sky: The base sky color at the zenith. For normal blue skies light blues or black (which then relies entirely on GenesisII's light scatter to produce a dark sky blue) work best. Other colors can also give interesting effects.
• Horizon: The color the atmosphere will tend towards at the horizon. The rate of transition between Sky and Horizon colors is controlled by the positions of the atmosphere floor and ceiling, and .
• Mist: Mist color.
• Decay: Used to fine-tune the light decay profile. Generally this

Sun Position

These control set the altitude and azimuth position of the sun. You can click and drag directly on the blue dial controls or use the edit boxes.

Advanced Parameters

These parameters control how the atmosphere is modeled and should only be altered from the defaults with care.

• Atmospheric Ceiling: The top of the atmosphere. Light traveling above this will not be affected by atmospheric physics. Also effects the behavior of light below the ceiling, particularly for parameters which use the distance between atmosphere ceiling and floor to calculate effects. Default value is 200.0 but may need to be increased for high altitude landscapes.
• Atmospheric Floor: Nominal bottom of the atmosphere. Default is -100.0. May need to be increased in parallel with atmosphere ceiling for high altitude landcapes.
• Atmospheric Control Distance: Nominal distance to the sky. Default is 250.0.
• Infinity: Nominal infinite distance. Default is 10000.0