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。
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.
该方程只涉及乘法运算，用于转换散射电子的空间坐标。
Using the equation to transform spatial coordinate of scattering electron only involves with multiplication.
根据正投影的机理，建立了点线面屏幕坐标与空间关系的转换关系。
According to mechanism of orthographic projection, this paper has set up the converted relation between screen coordinate and space coordinate.
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