It can be a normal vector of any length you want to the surfaces.
它可以是曲面上想要的任意长度的法向量。
This is a normal vector of the same length as n, well, up to sign.
这是与N长度相同的法向量，只是符号不定。
Zero vector can have a lot of direction, but only one length.
零向量可以有很多方向，却只有一个长度。
Returns the length of this vector (Read Only).
返回这个向量的长度（只读）。
The radius vector of each solid is always a positive length.
每个立体的矢径总是正值长度。
获取此向量的长度。
获取此向量的长度。
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