Hi Pilou,

> and draw it by helpline for have the oposite mirror points?

This was how I drew my version, by dragging out construction lines from the centerline so that I had end point snaps on either side of it.

But yes doing a mirror + join + delete control point where the segments touch will also work.

In the future I want to add a "symmetry draw" function to make it easier to draw single segment curves like this with only needing to draw the points on one half.

- Michael