Let's start with a triangle in the plane Well, then we need two vectors to describe it say A and B here. How do we find the area of a triangle?
平面上有一个三角形,用两个向量描述,记作A、B，怎样求三角形的面积？
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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