Hi Pilou, also note that the method that I recommended earlier just does not work right, for actually a couple of reasons (sorry I led you astray!).

One reason is that you'll need to get equal length line segments which is not necessarily easy to automatically generate.

Then the other is you need to arrange things such that the point used for each array instance along the polyline falls within the midpoints of the polyline rather than right at the juncture between 2 segments. That's because if it is at the juncture between segments there are 2 possible tangents for that point and any small deviation from one side to the other will use one of those 2 possible tangents.

That's another reason why this would probably work best as a special tool that copied things to line segments rather than using the general purpose array curve for it.

- Michael