By offsetting all the texture coordinates individually, high areas of the surface would shift away from the eye and low areas of the surface would shift toward the eye.
通过偏移所有这样的贴图坐标，表面上的较高的地方会相对眼睛被移远，而低的地方被移近。
Input should contain any texture coordinates and extra automatic variables needed by surface function.
Input结构中包含所有纹理坐标和surfaceFunction所需的额外的自动变量。
Input should contain any texture coordinates and extra automatic variables needed by surface function.
Input结构中包含所有纹理坐标和surfaceFunction所需的额外的自动变量。
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