他抓握有力，他会把头朝向光源。
His grip is strong now and he'll turn his head toward light sources.
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.
在我们的场景里，只有朝向光源的多边形是被照亮的。
At the moment, only the polygons pointed towards the light source will be lit.
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