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When the sun is at its zenith, it should be set to 120000 lux (or cd:sr*m The Sky Atmosphere gives an approximation of light scattering through a planetary atmosphere's participating media, giving outdoor levels a more realistic or exotic look by including the following: Ctrl + L + Shift with mouse movement will adjust the Directional Light set to index 1. Typically this would be the Moon. Shadowing from a Directional Light source is used to create sunlight shafts within the atmosphere for ground-level and space views. 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.

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If using multiple Directional Lights, set the Atmosphere Sun Light Index for each; for instance, 0 for the Sun and 1 for the Moon. The Sky Atmosphere visualization and debugging view enables you to see—in real time—the changes you make to the atmosphere settings. Trade performance for quality increase by increasing the number of samples with r.SkyAtmosphere.SampleCountMax or r.SkyAtmosphere.DistanceToCountMax.

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The Sky Atmosphere system is optimized for scenes that are on ground level. However, there is nothing preventing you from traveling from the ground to a high aerial view, or even outer space. While the transition through the atmosphere should be seamless—without a noticeable transition—from the look-up tables (LUTs) to per pixel tracing, you may sometimes experience a hitch or when this happens. The Time-of-Day Preview displays different times of day based on the settings that are applied to the Sky Atmosphere component. Place a Sky Light in the scene to capture Sky Atmosphere and have it contribute to the scene lighting.

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To set up a skydome mesh to work with the Sky Atmosphere component, you'll need to set the following in its Material: Enable the Sky Atmosphere component by following these steps using the Modes panel in the Level Editor: 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. In this material, you will have the freedom to compose the sky, sun disk, clouds and aerial perspective. Also, you will have to compute lighting on the clouds and other elements in the sky. Several Material Expressions can be used to achieve this in your materials. You can find them by searching the term "SkyAtmosphere" in the Material Editor. Ctrl + L with mouse movement will adjust the Directional Light set to index 0. Typically this would be the Sun.The sky material is rendered as the last opaque mesh during the base pass, meaning that aerial perspective will not be applied on it to avoid double contribution. However, height fog and volumetric fog will continue to be applied, if used. Use caution when increasing the Aerial Perspective LUT. It uses a 3D volume texture. Increasing its size can significantly increase memory usage. 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.

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The Graph View shows a representation of Rayleigh, Mie, and Absorption values within the Sky Atmosphere component's set Ground Level and Atmosphere Height.

Set a high value for the Dynamic Shadow Distance. For instance, the examples below used a shadow distance of 100000000 units (or 1000 kilometers). 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. Achieving cinematic quality of atmosphere rendering is done by disabling the Sky View and Aerial Perspective LUTs optimizations, which use a lower resolution to be performant. They can be disabled by setting r.SkyAtmosphere.FastSkyLUT and r.SkyAtmosphere.AerialPerspectiveLUT.FastApplyOnOpaque to 0. Atmosphere will become slower to render but produces fewer visual artefacts with high-frequency detail that appear in some areas, such as a planet's shadow or its scattering lobe. You'll also want to increase the tracing quality on the Sky Atmosphere component (see above). Enable Cast Shadow on Atmosphere to cast shadows from opaque objects. Also, enable Cast Cloud Shadows to enable shadow casting from cloud materials when using the Volumetric Cloud system. 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.