Light World

A lighting type:照明类型：

• None — render the atmosphere as if there were no global lights, that is, there will be no sky color gradient in any direction.None —就像没有全局光源一样渲染气氛，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。

注意

Light scattering is defined by a combination of environment scattering LUTs (Look-Up Textures) describing different states of the sky during the day. The atmosphere is rendered based on interpolation between these LUTs.光散射由以下各项的组合定义环境散射LUT（查找纹理）描述白天的不同天空状态。根据这些LUT之间的插值渲染气氛。

Scattering = Sun	Scattering = Moon

Shadow cascade generation mode to be used (available for the Static light mode only):要使用的阴影级联生成模式（适用于Static灯光模式只要）：

• Dynamic — In this mode shadow cascades are built dynamically relative to the camera position making it possible to change the time of day (day-night cycle).Dynamic —在此模式下，阴影级联是相对于相机位置动态构建的，从而可以更改一天中的时间（昼夜循环）。

• Static — In this mode shadow cascades are built relative to the light source position and baked. This mode is suitable as a performance optimization technique for small-area ArchViz projects where shadow cascades can be divided into 2 sections: walkable area with high-resolution shadows (as they're observed closely) and non-walkable area with low-resolution shadows (as they're observed from a distance).Static —在此模式下，相对于光源位置建立阴影层叠并进行烘焙。此模式适合作为小面积ArchViz项目的性能优化技术，在该项目中，阴影级联可以分为两个部分：具有高分辨率阴影的可行走区域（如被仔细观察）和具有低分辨率阴影的不可行走区域（因为它们是从远处观察到的）。

  注意

  Changing the time of day is not available in this mode, as shadow cascades are baked.在此模式下，更改一天中的时间不可用，因为阴影级联已烘焙。

A number of cascades with different shadow maps. Each cascade requires a separate rendering pass. All the shadow maps have the same resolution (the Shadow Resolution parameter value), but are applied to different cascades. Thus, close-range shadows are of higher quality and distant ones of lower. The minimum number of cascades is 1, the maximum is 4. Increasing the number of cascades enhances the rendered image quality. However, at that, performance efficiency drops.许多具有不同阴影贴图的级联。每个级联都需要单独的渲染过程。所有阴影贴图具有相同的分辨率（参数Shadow Resolution的值），但应用于不同的级联。因此，近距离阴影的质量较高，远距离阴影的质量较低。级联的最小数量为1，最大为4。级联数的增加可增强渲染图像的质量。但是，那样会降低性能效率。

注意

To visualize the cascades, enable Helpers -> Shadow cascades.要可视化级联，请启用Helpers -> Shadow cascades。

In Static cascade mode, shadow cascades are additionally visualized by the boxes that define the shadow area.在静态级联模式下，阴影级联还通过定义阴影区域的框可视化。

A multiplier for the distance to the border of the cascade in range [0;1].到级联边界的距离的乘数，范围为[0;1]。

Distance to the border depends on the Cascade Mode and is set as follows:到边界的距离取决于Cascade Mode，其设置如下：

• For Dynamic mode — corresponds to the Shadows Distance value and is measured from the Camera position.对于动态模式-对应于Shadows Distance值，并从“相机”位置开始测量。
• For Static mode — is defined by the dimensions of the shadow area box projection and measured from the Light World position.对于静态模式-由尺寸阴影区框投影并从Light World位置开始测量。

The number of cascade borders depends on the number of cascades:级联边界的数量取决于级联的数量：

• For one cascade, there is no cascade border.对于one级联，没有级联边界。
• For 4 cascades, there are 3 cascade borders (for the first three cascades).对于4级联，有3个级联边界（对于前三个级联）。

For the last cascade, the multiplier is always 1.对于最后一个级联，乘数始终为1。

Setting the cascade borders allows you to accurately adapt the quality of the shadows depending on their remoteness from the viewer.设置级联边界使您可以根据阴影与观看者之间的距离来准确调整阴影的质量。

• Decreasing the multiplier value makes the cascade smaller, more compact positioned and covering less distance. At the same time, the resulting shadow is of a higher quality.减小乘数将使级联更小，位置更紧凑且距离更短。同时，产生的阴影具有更高的质量。
• Increasing the multiplier value makes the cascade larger with broader coverage of the area.增加乘数值将使级联变大，面积覆盖范围也更大。

Cascade border 0 = 0.02 (shadow of higher quality)	Cascade border 0 = 0.1

Distance from the light source position along the light direction vector.沿光方向向量到光源位置的距离。

注意

Ensure that ZFar distance is big enough to have both objects and surfaces that take shadows within the shadow area box.确保ZFar距离足够大，以使对象和曲面都在阴影区域框中包含阴影。