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A sky color that will vary, depending on the altitude of the sun, or in other terms, how close the dominant Directional Light's vector gets to being parallel with the ground. 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.

Atmosphere Component Properties - Unreal Engine Sky Atmosphere Component Properties - Unreal Engine

Shadowing from a Directional Light source is used to create sunlight shafts within the atmosphere for ground-level and space views.

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The Sky Atmosphere visualization and debugging view enables you to see—in real time—the changes you make to the atmosphere settings. 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. To set up a skydome mesh to work with the Sky Atmosphere component, you'll need to set the following in its Material: Place a Directional Light in the scene, and from its Details panel, enable Atmosphere/Fog Sun Light.

The Ultimate Guide to the Best Atmospheric Lighting: How to

The Hemisphere View shows a visual representation of your atmosphere, taking into account Rayleigh and Mie scattering along with Absorption. 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. Enable the Sky Atmosphere component by following these steps using the Modes panel in the Level Editor: The Graph View shows a representation of Rayleigh, Mie, and Absorption values within the Sky Atmosphere component's set Ground Level and Atmosphere Height.

Why is the Sky Blue?

Use caution when increasing the Aerial Perspective LUT. It uses a 3D volume texture. Increasing its size can significantly increase memory usage. 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. 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. 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).