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In an Earth-like atmosphere, when sunlight interacts with small particles (1) in the atmosphere (2), Rayleigh scattering happens throughout the atmosphere. The upper atmosphere is less dense compared to the lower atmosphere near the Earth's surface (3). The tracing quality of the atmosphere is scalable using the Sky Atmosphere component's Trace Sample Count Scale property. This property is important when generating LUTS, or when using per pixel tracing. The maximum number of samples is clamped but can be increased by using the console command r.SkyAtmosphere.SampleCountMax. Also, keep in mind that the number of samples only reach the specified kilometers set by r.SkyAtmosphere.DistanceToSamplesCountMax.

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When the sun is at its zenith, it should be set to 120000 lux (or cd:sr*m Should your project require Exponential Height Fog, it can be enabled in the Project Settings under the Rendering category by setting Support Sky Atmosphere Affecting Height Fog. The Sky Atmosphere component in Unreal Engine 4 (UE4) is a physically-based sky and atmosphere-rendering technique. It's flexible enough to create an Earth-like atmosphere with time-of-day featuring sunrise and sunset, or to create extraterrestrial atmospheres of an exotic nature. It also provides an aerial perspective to which you can simulate transitions from ground to sky to outer space with proper planetary curvature. If using multiple Directional Lights, set the Atmosphere Sun Light Index for each; for instance, 0 for the Sun and 1 for the Moon. Increased particle density causes the sky to become occluded. It also causes the sky to appear hazy with the strong forward scattering lob around the incident light direction.Set up logic to adjust and tweak atmospheric properties when in outer space to have less particles near the ground, making them more uniform and height distributed. Enable the Sky Atmosphere component by following these steps using the Modes panel in the Level Editor: A high frequency pattern can become visible when it should be absorbed by temporal anti-aliasing (TAA). However, when moving the camera very fast, there is a camera cut that happens—restarting TAA—so it is visible in space views. For outer space views, enable Per Pixel Atmosphere Transmittance to apply accurate planetary shadowing that also casts shadows on nearby celestial objects, such as a moon. The Graph View shows a representation of Rayleigh, Mie, and Absorption values within the Sky Atmosphere component's set Ground Level and Atmosphere Height.

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Atmospheric Height to define the height of the atmosphere above which we stop evaluating light interactions with the atmosphere. Simulating the sky and atmosphere in UE4 requires several properties that mimic the look and feel of a real-world atmosphere. These properties can be used to define the look of the sky and atmosphere by scattering light in an appropriate and accurate manner. By default, the Sky Atmosphere component in UE4 represents the Earth. You can have two atmospheric Directional Lights that receive sun disk representation in the atmosphere with sky color that depends on the sunlight and atmosphere properties.

With these set, you can use the Sky Atmosphere's Height Fog Contribution setting under the Art Direction category to apply artistic control over how much light coming through the atmosphere affects the height fog. Place a Sky Light in the scene to capture Sky Atmosphere and have it contribute to the scene lighting. Ctrl + L + Shift with mouse movement will adjust the Directional Light set to index 1. Typically this would be the Moon. The sky color changes depending on the time-of-day simulation when using the Sky Atmosphere component. Rayleigh Scattering Once disabled, it is worth noting that you may encounter the following issues. These are some suggestions to help you work around them for your project to find a balance that best fits your project.