目的：研究不同方向光源对数码色度值的影响。

Objective: To study the effect of light from different direction on digital chromatic value.

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如果灯光是聚光灯或方向光，这必须是一个2d纹理。

If the light is a Spot or a Directional light, this must be a 2d texture.

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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.

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