... Between Surface Tangents 曲面间切线平面夹角 Surface Tangent Plane 曲面上任一点的相切平面 Point Location 任一点坐标 ..
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Pick Surface Tangent Plane 相切平面方程式 ; 曲面上任一点的相切平面方程式
Well, that means the gradient is actually perpendicular to the tangent plane or to the surface at this point.
那意味着,梯度向量在这点上,垂直于切平面或者是等值面。
Now, if I have two lines tangent to the surface, well, then together they determine for me the tangent plane to the surface. Let's try to see how that works.
现在,假设曲面上有两条相交切线,那么这两条切线可以确定一个切平面,我们来看看这个平面是怎么搞出来的。
And, at this point, I have the tangent plane to the level surface OK, so this is tangent plane to the level.
在这点上,我们有一个切于等值面的切面,这就是等值面的切平面。
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