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。
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。
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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