Hi SUIYAN,

re:
>（This is a boundary surface problem, and there is no corresponding processing tool in Moi.
> In Rhino, you should use the patch tool and then trim it. Please take a look at the pictures
> and demonstrate the process of gif.）

That's something that can be useful in certain cases but it's usually a better modeling technique in NURBS to form extended simplified 4 sided surfaces and then form the final boundary by a boolean operation.

- Michael

Appreciate the quick response guys! I will try these methods out. Couldn't be more grateful, you've been a great help. Thanks!

HI Michael

非常认同，我在#3的讨论中也表达了这样的意思。不过人们更倾向于基于模型原本元素的直接工具，所以我的演示更倾向于此。（I completely agree, and I also expressed this idea in the discussion of # 3. However, people tend to use direct tools based on the existing elements of the model, so my presentation is more inclined towards this.）