环境

The environment system simulates Scattering by interpolating specific pre-computed Look-UP Textures (LUTs) to achieve physically correct atmosphere rendering and decent ambient lighting.为了实现正确的大气渲染和良好的环境照明，环境系统通过内插特殊的查找纹理（LUT）来模拟 散射 。

The Environment Settings are available in the Render Settings (choose Window -> Settings in the main menu, then, in the Settings window, go to Runtime -> World -> Render -> Environment). 环境设置 在“渲染设置”中可用（在主菜单中选择Window -> Settings，然后在Settings窗口中转到Runtime -> World -> Render -> Environment）。

Environment Settings环境设置

Three Environment Presets enable you to interpolate between most of the parameters. Presets work as layers: Preset 1 overlays Preset 0, Preset 2 overlays Presets 1 and 0. By configuring the presets, it is possible to create a smooth transition between different weather conditions by tweaking the Intensity scroll bars.共有三个 Environment Presets ，可让您在大多数参数之间进行插值。预设用作图层：第一个预设将覆盖零个，第二个将覆盖第一个和零个。通过配置预设，可以通过调整强度滚动条在不同天气状况之间创建平滑过渡。

The transition between two Environment presets两个环境预设之间的过渡

The atmosphere rendering is based on interpolation between several LUTs (Look-Up Textures) describing different sky states during the day.大气渲染是基于几个LUTs (Look-Up Textures)之间的插值，这些插值描述了白天的不同天空状态。

Scattering LUT settings分散LUT设置

• The Base LUT texture defines the base color of the sky, given the current position of the light source. Base LUT纹理定义给定光源当前位置的天空的基色。
• The Mie LUT texture defines the Mie light (the color of the light around the Sun and the Moon). Mie LUT纹理定义了Mie光（太阳和月球周围的光的颜色）。
• The Light Color texture defines the color of the World Light for different times of the day. Light Color纹理定义了一天中不同时间的World Light的颜色。

The scattering simulation is affected by the current enabled World Light Source that automatically generates the dynamic environment cube map providing lighting and reflections for all objects in the scene.散射模拟受当前启用的World Light Source影响，该参数会自动生成动态环境立方体贴图，为场景中的所有对象提供照明和反射。

The Scattering option of the World Light provides the following lighting types: World Light的Scattering选项提供以下照明类型:

• None — render the atmosphere as if there were no global lights: there will be no sky color gradient in any direction. None —像没有全局光照一样渲染气氛，也就是说，在任何方向上都没有天空颜色渐变。
• Sun — render the atmosphere in accordance with the sun's lighting. Sun —根据太阳的光照渲染气氛。
• Moon — render the atmosphere in accordance with the moon's lighting. Moon —根据月球的照明渲染气氛。

Scattering options of the World Light World Light的散射选项

The Disable Angle setting for the World Light defines a critical angle above the horizon, where the light source is still enabled. Thus, an appropriate day-night cycle is easy to implement: you can create two World Lights representing the Sun and the Moon, which will replace each other with global time. World Light的Disable Angle设置定义了地平线上方的临界角，仍在该角度启用光源。 因此，很容易实现适当的昼夜循环：您可以创建两个代表太阳和月亮的世界之光，它们将随着全球时间相互替换。

Day-night cycle using 2 World Lights使用2个世界之光的昼夜循环

环境设置还包括环境光照强度，雾度，天体等设置。

Ambient lighting and reflections can also be defined by a cube map set as the Environment Texture. You can download suitable images from such websites as polyhaven.com. We recommend using an HDR or uncompressed EXR image for better shading results. Note that lossy compression types B44, B44A, PIX24, which the EXR format may use, are not supported. 环境照明和反射也可以通过设置为Environment Texture的立方体贴图进行定义。你可以从 polyhaven.com 等网站下载合适的图片。我们建议使用 HDR 或未压缩的 EXR 图像，以获得更好的阴影效果。请注意，EXR格式可能使用的有损压缩类型B44, B44A, PIX24 是 不支持的。

Environment Texture settings环境纹理设置

注意

• Note how Ambient lighting affects the color of shadowed areas, making them more saturated by the sky (e.g., more bluish in the default Preset 0). Refer to the Global Illumination section if you need to simulate realistic light propagation in a virtual environment.
• If you need to change reflections locally, for example, indoors, use an Environment Probe with a unique cube map or consider other types of reflections.

如果需要在本地（例如室内）更改反射，请使用具有唯一立方体贴图的环境探针。

Additionally, a Sky Object is used to recreate the atmosphere in the scene. It can represent a hemisphere or a sphere with a cube map assigned, tiled with clouds texture to produce plausible and inexpensive dynamic clouds.另外，使用Sky Object可以重新创建场景中的气氛。它可以表示分配有立方体贴图的半球或整个球体，并用云纹理平铺以产生合理且廉价的动态云。

See Also也可以看看#