You can use predefined ambiences and customize their parameters to create your own ambience.
When you select this type, you can edit specific parameters.
Defines a gradient color and separates the background in two, creating a horizon.
You can choose a top and bottom sky color, and a top and bottom ground color.
You can also modify the horizon altitude.
Objects are in an infinite outdoor landscape.
Objects are in an enclosed space and light sources are blocked by walls or other similar elements in the scene.
The selected ambience is applied in the 3D area.
You can then use the ambience panel, customize the parameters for the selected ambience.