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。

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.

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法线贴图使用颜色来表述在其他方向的偏移，这使它更有效。

Normal mapping on the other hand uses colors to indicate directional offsets, making it far more efficient.

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视差贴图技术的过程有以下要求：对每个像素都做处理中，一个贴图坐标能被多张贴图使用，并且能做一些偏移。

The process of parallax mapping requires that, for each pixel drawn, a texture coordinate, used to index one or more texture maps, be corrected by some displacement.

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