After loft, line is missing

Hi, wonder why there is no connected line there?


profile is like this:

Hi Wilson -

But then you should also wonder why there are no such lines in these locations:

The answer is likely that there is no crease splitting in Grasshopper. When you create an object from tangent input curves, the result will be a single surface.

The fact that there is a connecting line in that one location shows there’s a tangency issue in that location.

But, since you didn’t post your *.gh file with all relevant referenced geometry internalized, that is just speculation…

Note that, for many downstream operations, it is better to have a polysurface rather than a single surface. You could consider to loft (or extrude) single segments and joining them after that operation.

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