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。
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。
Each edge point has a normal vector pointing in the direction perpendicular to the edge.
每个边缘点具有正常矢量指向在垂直的方向上的边缘。
Each edge point has a normal vector pointing in the direction perpendicular to the edge.
每个边缘点具有正常矢量指向在垂直的方向上的边缘。
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