This is a normal vector of the same length as n, well, up to sign.
这是与N长度相同的法向量，只是符号不定。
That would be an example of a vector field that comes up in physics.
这是物理学中向量场的例子。
And so the normal vector is going towardS what is up for me.
所以法向量指向我的上方。
The normal vector is just sticking straight up or straight down.
从而法向量的方向是竖直向上或向下的。
Now take your disk with its normal vector sticking up.
现在我们拿这个法向量向上的圆盘。
A target and intersect body was chosen, the intersect vector class was set up.
先选定目标和交叉体、并设定其相交矢量类。
A target and intersect body was chosen, the intersect vector class was set up.
先选定目标和交叉体、并设定其相交矢量类。
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