我使用灯光贴图而不是UV模版的原因是灯光贴图能更好的展现旧的面貌。

We used Lightmap instead of UVTemplate because Lightmap can show a better and more old-fashioned appearance.

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它通过顶点法线所定义的方向察看每个目标面，然后根据来自法线贴图的信息通过补偿它来计算新的灯光效果。

It looks at each target face's direction as defined by it's vertex normals and calculates the new lighting solution by offsetting it with the information from the normal map.

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阴影贴图是基于纹理的方式，最简单的方法把它看作是“阴影纹理”，从灯光投射阴影到场景。

Shadow mapping is a texture based approach, it's easiest to think of it as "shadow textures" projecting out from lights onto the scene.

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