月亮的移动可以柔化浓厚的阴影，但是移动过度则会使光线平淡。
Moon movement softens harsh shadows, however too much movement can create seemingly flat light.
阴影柔化是根据到相机距离进行淡出的。只用于方向光。
Shadow softness fade based on the distance from the camera. Directional light only.
这个削弱的条件提到了阴影的分散或柔化，如果它是从能产生阴影的物体上得到的。
The term attenuated refers to the dissipation or softening of the shadow as it gets further from the shadow-casting object.
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