Ambient

Ambient Sky/Equator/Ground Color

These three colors determine the ambient lighting color coming from the skybox. This ambient lighting is used in calculations for both primary GI close to the camera, as well as the fallback GI for far away objects.

Ambient Lights

If you want a more manual way to define ambient lighting, then you can use this array to define as many ambient "lights" as you want with a direction, color, and intensity.

Ambient Intensity

A multiplier on the intensity of ambient light from all sources.