以往景物中最明亮的部分，天空，此刻变得暗淡无光。
Instead of being the brightest part of a scene, the sky becomes the darkest.
当太阳和乌云纠缠不休时，总能时不时地露一小脸，照亮景物的某个部分。
The best bad weather is a stormy day, when the sun is battling the clouds and often breaks through to ignite one part of the scene.
点光源或者完全或者部分被场景物体遮挡的聚光灯光源所照射的像素则被GPU所跳过，因此更加廉价。
Point or spot lights that are fully or partially occluded by some scene objects get their pixels skipped on the GPU, so they are even cheaper.
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