Hi Tudor, for offset the input index 1 is for a distance value, it is only filled in if you are using offset in its "offset by specific distance" mode, not in through point mode.

So for example if you type in 3 and push enter that input will get initialized to 3 and then your messages would show "3" and "true" when you pick a point for which side to offset on.

There was at one point a "curveOffsetDistance" additional property on the offset factory that would give back the current distance used for "through point" mode, but it's not working currently. I'll take a look and see if I can get that working.

- Michael