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Aerial perspective that simulates the curvature of the world when transitioning from ground to sky to space views.

Sky Atmosphere | Unreal Engine Documentation Sky Atmosphere | Unreal Engine Documentation

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. Absorption of some colors may not be as noticeable during different times of day due to the way light scatters through the atmosphere. Altitude Distribution Place a Directional Light in the scene, and from its Details panel, enable Atmosphere/Fog Sun Light. Enable the Sky Atmosphere component by following these steps using the Modes panel in the Level Editor:Planet Top at Absolute World Position places the top ground level of the atmosphere at the world origin coordinates (0,0,0) in the scene. The Sky Atmosphere is not movable when this option is selected. The Graph View shows a representation of Rayleigh, Mie, and Absorption values within the Sky Atmosphere component's set Ground Level and Atmosphere Height. 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 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. Ctrl + L + Shift with mouse movement will adjust the Directional Light set to index 1. Typically this would be the Moon.

Expert advice: how to create atmospheric lighting at home

The Sky Atmosphere visualization and debugging view enables you to see—in real time—the changes you make to the atmosphere settings.Ctrl + L with mouse movement will adjust the Directional Light set to index 0. Typically this would be the Sun. 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. Decreased scattering causes light to scatter less through the atmosphere. This is 10x less dense than Earth's atmosphere. When the sun is at its zenith, it should be set to 120000 lux (or cd:sr*m 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.

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Trade performance for quality increase by increasing the number of samples with r.SkyAtmosphere.SampleCountMax or r.SkyAtmosphere.DistanceToCountMax. This video uses assets and materials that are not part of the Sky Atsmosphere system, such as the star field and meshes that represent the planet surface. 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.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. Use caution when increasing the Aerial Perspective LUT. It uses a 3D volume texture. Increasing its size can significantly increase memory usage. Set a high value for the Dynamic Shadow Distance. For instance, the examples below used a shadow distance of 100000000 units (or 1000 kilometers). 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. The Sky Atmosphere component is freely movable within Level using the selectable Transform Mode. Choose from the following options:

Atmospheric refraction - Wikipedia

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 sky color changes depending on the time-of-day simulation when using the Sky Atmosphere component. Rayleigh Scattering Atmosphere Height defines the height of the atmosphere above the planet's surface (measured in kilometers). 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 Hemisphere View shows a visual representation of your atmosphere, taking into account Rayleigh and Mie scattering along with Absorption.

Sky Light

Stores a latitude/longitude texture of the ray ray marched sky luminance around a point of view. It is applied on the sky pixels only.