Function attrack

Best wishes!!! I am submitting to you a small problem with the “attrack” function. During a first test the curve made the entire cylinder but it stretched in certain places. So I lengthened the curve but now it does not go around the cylinder … if you have any idea
ps: in subd mode it’s identical

Good morning,
for this kind of things you should use the _FlowSrf tool.

Happy new year.

Thank’s skysurfer