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.
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.
基础通道用一个逐像素方向光和所有球面调和光渲染物体。
Base pass renders object with one per-pixel directional light and all SH lights.
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