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@dexus Your animations are really original although I don’t think I managed to see exactly the same thing you showed in your video. But that doesn’t matter. Today I had the whole afternoon free, and I decided to try to “stress-test” your code. I drew several irregular margins and also tried to draw something resembling a “inlet” like the ones GLAVCVS mentions. However, the result was very consistent. In no case was it possible to make the centerline “lose orientation.” It only failed in the case of closed margins, as shown in the attached image. But I assume this happens because you didn’t consider that possibility, given the context of the rest of my examples. Also, there are a few minor details in some wide curves where the centerline clearly drifts away from the middle. Overall, the result is EXCELLENT. Regarding the “inlets” that @GLAVCVS mentions, I suppose it would be great to have a tool capable of robustly handling those cases. But, normally, these situations only occur in a few places and can be handled manually. In any case, a tool like that would definitely put its author’s name on the map. PS: I've attached the drawing of the image. AxisExple3.dwg

You could try the search function... maybe this thread from lasty week might help?