The eye vector can be created in global coordinates by subtracting a surface position from the eye position and transforming the resulting vector into tangent space.

视向量能够在全局坐标系中通过视点坐标减去表面坐标来创建，并且要把结果转换到切线空间中。

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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。

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And therefrom three formulas for calculating the coordinates of the eye movement track and the rotating angle of mandrel are given.

从而得出了丝嘴运动轨迹坐标和芯模转角的计算公式。

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