Sure, I must training this part of the prog ! :)

That I say by same orientation : if I take the same orientation of the orient function than my object that works on the top curve surface, that don't work for the single curve!
That is curious that we must take some different regulate for a curve who have same position except a move displacement

In the file , I want move my object like your cone :)

I must find a tricky way for not have hesitate to choose the good orientation of the axe of the Orient tool!