The first unit about cross-products,normal vectors and so on is actually useful now.

第一单元学得叉积、法向量这些,现在就有用了。

youdao

And the way it will work is that you have to choose an orientation of a surface, which just means choosing one of the two possible unit normal vectors.

具体方法是，先给曲面定向，也就是选择两个单位法向量中的一个。

youdao

And the way it will work is that you have to choose an orientation of a surface, which just means choosing one of the two possible unit normal vectors.

具体方法是，先给曲面定向，也就是选择两个单位法向量中的一个。

youdao