Exponential Height Fog
An overview of the height-based, distant fog system.
Unreal Engine provides a set of components that allow for designers and artists to create immersive worlds with physically based lighting at large — or even small — scale while working efficiently to do so. These environment lighting components for atmosphere, clouds, fog, and lighting all work seamlessly together to create a unified experience that supports fully dynamically lit worlds.
The tools and features in this page will help you get started with creating your own worlds.
Environment Light Mixer
The Environment Light Mixer is a dockable editor window where you can add, edit, and reference properties of environment lighting components for sky, clouds, atmosphere lights, and a sky light.
For arists and designers, this window simplifies and can speed up your workflow by having them all available in one location.
For more information, see Environment Light Mixer.
Fog Effects
Fog effects are useful for adding ambiance to the world and setting the mood for environments. This includes creating multi-layered fog for high and low-lying areas, and volumetric effects for light shafts.
The Sky Atmosphere includes its own scattering and height fog simulation, but also works well with the Exponential Height Fog to support all types of lights in the scene.
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When the Project Setting Support Sky Atmosphere Affecting Height Fog is enabled, any contribution from Exponential Height Fog is additive. The Sky Atmosphere's height fog is applied on top of the Exponential Height Fog colors. However, should the Fog Inscattering Color and Directional Inscattering Color be set to black, the Sky Atmosphere will directly affect and influence the coloring of any Exponential Height Fog in the scene.
Fog Effects Topics
Atmosphere, Cloud, and World Lighting Effects
The lighting components for Sky Atmosphere, Volumetric Clouds, Directional Lights, and Sky Light make up the majority of your enviornment lighting. These components all work seamlessly together dynamically lit large worlds possible.
In your Levels, you can use the following components:
Up to two Directional Lights for the sun and moon, two suns, or any combination.
A single Sky Light with optional real-time capturing.
A Sky Atmosphere with its own height fog.
Volumetric Clouds with or without a sky dome mesh.
With Real Time Capture enabled on the Sky Light, use the keyboard shortcut Right Ctrl + L (first Directional Light) or Right Ctrl + Right Shift + L (second Directional Light) in combination with moving the mouse to change lighting dynamically and see the results instantly.
