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The atmosphere rendering is based on interpolation between several LUTs (Look-Up Textures) describing different states of the sky during the day.
The built-in WorldLight dynamic environment cubemap automatically generates lighting and reflections for all objects in the scene. The result depends on the position of the Sun and Moon. It acts similarly to the infinitely large environment probe, but works faster and doesn't require placing addition object to the scene.
Sun and Moon
The WorldLight Scattering option provides the following lighting types:
- None — render the atmosphere as if there were no global lights, that is, there will be no sky color gradient in any direction.
- Sun — render the atmosphere in accordance with the Sun's lighting.
- Moon — render the atmosphere in accordance with the Moon's lighting.
There is also a new Disable angle setting for LightWorld defining a critical angle above the horizon, where the light source is still enabled.
The environment cubemap is tweaked in the Rendering panel -> Environment tab. The scattering can have up to 3 separate settings presets that can be blended by the Preset intensity scroll bars.
Presets work as layers: the first preset will overlay the zero one, the second will overlay the first and the zero ones. For example, you can set the zero preset for the clean and clear sky, set the first preset for the cloudy sky and lerp them smoothly.
Scaterring LUT Settings
All the presets settings are identical. The scattering versatility is achieved mostly because of the scattering LUT textures.
Base LUT Texture
Ground LUT Texture
Mie LUT Texture
Light Color LUT Texture
Environment settings are required for creating environment by means of panorama (cubemap). Besides, this texture is used for imitating landscape reflections and lighting in accordance with the Ground mask.
|Texture||A cubemap defining the environment color.|
|Color||The environment color multiplier, where alpha defines the visibility of a cubemap above scattering. This parameter is required when you need to display a sky with a photo texture and dynamic gradients at the same time.|
This group of parameters set the atmosphere haze. It automatically uses the color from the scattering LUTs, so objects smoothly fade into the distance without any artifacts.
The haze is controlled by the render_haze console command:
- 0 — disables the haze.
With this mode on, performance is slightly increased.
- 1 — uses the haze color from the color parameter.
- 2 — uses the color from the sky LUTs (recommended for better realism).