HI Michael

好吧，我使用direction模式，然后separate后进行sweep or pipe.js就非常顺利。（附件图片）希望能够解决closest point's bug。

（To send a file that large you will need to use a file sharing service instead of making a forum attachment.）
能够使用截取图片演示吗？我刚刚接触使用 moi3d forum。你知道这些在中国的forum非常的简单。（在使用closest point生成的曲线，点击pick scaling rall能够增加管道生成的概率，尽管还是不能用于布尔等操作。）

Okay, I'll use the direction mode, then separate and proceed with sweep or pipe.js very smoothly. (Attached image) Hope to solve the closed point's bug.
(To send a file that large you will need to use a file sharing service instead of making a forum attachment.)

Can use screenshots to demonstrate? I just started using moi3d forum. You know these forums in China are very simple. (Clicking on pick scaling all can increase the probability of pipeline generation when using closed points to generate curves, although it still cannot be used for Boolean operations.)

Ps：direction与closest point生成的曲线仍然不同的（s4.png）因此应该使用rebuild curves结果更加准确。
The curves generated by direction and closed point are still different (s4. png), so rebuilding curves should be used to obtain more accurate results.

PS2:我发起这篇讨论的初衷是想解决moi3D所有同类或相似的问题，简单的说就是不同曲线的管道扫略（实际可能与fillet等功能都有关联），在我的使用过程中有将螺旋线投影到五角星体或多边形体，所扫略生成的管道都有概率有一些问题。但对我来说起码能够生成就可以，花时间总能够解决问题，但这次是因为不能生成。（我认为fillet的本质也是面在空间弯折后拟合结果，所以与管道是同一种类型的问题。）
（PS2: My original intention in initiating this discussion was to solve all similar or similar problems in Moi3D, in simple terms, pipeline scanning for different curves (which may actually be related to filling and other functions). During my use, I projected spiral lines onto pentagons or polygonal shapes, and the pipelines generated by the scanning may have some problems. But for me, at least being able to generate is enough. Spending time can always solve problems, but this time it's because I can't generate. (I think the essence of filling is also the fitting result of the surface after spatial bending, so it is the same type of problem as the pipeline.)）