When he was writing something intended for other people, he wrote in the normal direction.
如果他写的东西是给别人看的，他会按正常方向书写。
And, in terms of direction, it will be normal to the surface.
对于方向，则是曲面的法方向。
Each edge point has a normal vector pointing in the direction perpendicular to the edge.
每个边缘点具有正常矢量指向在垂直的方向上的边缘。
If you find no direction, there is no need to rush, in fact, this is normal.
如果你现在觉得没有方向，也没必要着急，其实这很正常。
If you find no direction, there is no need to rush, in fact, this is normal.
如果你现在觉得没有方向，也没必要着急，其实这很正常。
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