Here we don't have a notion of orienting the surface other than by precisely choosing one of the two possible normal vectors.
这里我们并没有曲面定向的概念，能做的就是，从两个法向量中选出一个作为正方向。
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。
If the two level curves are tangent to each other that means they have the same tangent line. That means that the normal vectors should be parallel. Let me maybe draw a picture here.
如果两个等高线相切，说明它们的切线相同，也就是说他们的法向量应该平行，我再在这里画个图。
Taking gauss curvatures and normal vectors as random variables, Lorentz Curve was extended to 3d Lorentz Surface.
以高斯曲率和法向量为随机变量，将洛伦兹曲线扩展为三维，得到洛伦兹曲面。
Normal vectors are vectors perpendicular to the face of each triangle that defines a mesh.
法向量是与构成网状结构的所有三角形表面都垂直的向量。
Normal vectors are vectors perpendicular to the face of each triangle that defines a mesh.
法向量是与构成网状结构的所有三角形表面都垂直的向量。
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