Solved! Go to Solution.
I suspect that the result depends on the parameter direction of the arc, not on where you select it. If I'm correct, then you'll get the result you want if you reverse the direction of the arc. Controlling arc directions is a bit tricky, though.
Hi @Yamada I just find the solution. Composite Curve can create a copy of the template spline with the reverse direction. Thanks!
I think that a "Reverse Direction" tool could be added to the "Select Template Curve" option for all the related features.