Light and shadow - though having the same source and the same origin, they are always in opposition.
光与影——虽然发源相同，起因一致，它们却往往背道而驰。
When an object space normal map tells a face it's supposed to receive light coming from the left of the object it will always do so, even if the face is pointing away from the light source.
当一个物体空间的法线贴图告诉一个面，它被期望接受来自物体左边的光线，它就会这样做，即使这个面实际是指向光源的。
Face the light: Lights can dispel shadows and create soft features on your face, so always try to turn your face toward the main light source.
面朝光线：光线能驱散阴影，让五官显得柔和。所以，自拍时要尽量面朝主要光源。
The speed of light is always the same regardless of the motion of the observer or the light source.
光速是恒定的，完全不依赖于观测者及光源的速度。
The speed of light is always the same regardless of the motion of the observer or the light source.
光速是恒定的，完全不依赖于观测者及光源的速度。
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