Hi Moi3dFan,

re:
> I encountered a problem, when a polyline turns into a polycurve, the script doesn't work anymore

Yes, that's correct, the script is only designed to work on polylines which is what you requested.

Making it work on other types of input would need a pretty different process, it would not be a small change to the script.

I'm sorry I'm not able to do it at this time.

- Michael