The geometry gym group is probably best place to ask questions, then I can attach files etc. http://www.grasshopper3d.com/forum/topics/extruding-profile-through-a might help you with orienting a profile to a surcace (surface normal closest to path curve mid point). I can add mesh if needed, but I'm sure in your case you can generate the underlying cylinder.
Jon Mirtschin
Hey Antonio,
The geometry gym group is probably best place to ask questions, then I can attach files etc. http://www.grasshopper3d.com/forum/topics/extruding-profile-through-a might help you with orienting a profile to a surcace (surface normal closest to path curve mid point). I can add mesh if needed, but I'm sure in your case you can generate the underlying cylinder.
Let me know if it doesn't help.
Sep 8, 2011