单位法(线)向量
Now, if you wanted the unit normal vector to compute flux, then you would just scale this guy down to unit length, OK?
如果想用单位法向量来计算通量,还得先把它标准化到单位长度?
A relation between the unit normal vector and principal curvatures of a surface and its corollaries
曲面法向单位矢与主曲率的关系及其推论
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