绿色螺旋线由内部每一个正方形和四分之一圆相切线构成，而红色的螺旋线是黄金螺旋线，它是对数螺旋线的一种特殊类型。
The green spiral is made from quarter-circles tangent to the interior of each square, while the red spiral is a Golden spiral, a special type of logarithmic spiral.
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。
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.
创建表面使用扫描第2轨与相切选项。为了实现切线选项，您将必须建设中的表面部分。
Create the surface using sweep 2 rails with the tangency option on. To achieve tangent option you will have to build the surface in parts.
创建表面使用扫描第2轨与相切选项。为了实现切线选项，您将必须建设中的表面部分。
Create the surface using sweep 2 rails with the tangency option on. To achieve tangent option you will have to build the surface in parts.
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