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Atmosphere
Unreal Engine provides a set of components for lighting environments. When lighting an outdoor environment, you need directional lights, a sky light, a sky atmosphere component, and volumetric clouds.
Click Window > Light Mixer to open the Light Mixer. Use this window to add, edit, and reference properties of Directional, Point, Spot, and Rect lights in your level.
Click Window > Env. Light Mixer to open the Environmental Light Mixer. Use this window to add, edit, and reference properties of environment lighting components for sky, clouds, atmosphere lights, and a sky light.
Station Example
In this station, there is a sky light, a directional light, and a sky atmosphere that control the environmental lighting and atmosphere for the level.
To change the direction of the sun, click the sky light, hold Ctrl + L, and move the mouse.
For more information about lighting an environment, see Environmental Light with Fog, Clouds, Sky, and Atmosphere.