Help needed for Sweeping a Rectangle profile

[Gijs (Gijs de Zwart)]

Your curve is not a clean spiral I see, so it will be difficult to script it. Otherwise there is a clear relation between a spiral pitch and amount of needed twist.
for more info take a look at this thread:

Is there a way to get the info about the rotation angle for a sweep 1 rail freeform?

I’m looking for a way to report back the total angle of twist of a 1-rail sweep that is set to freeform. See attached example. When I use roadlike and set it to top, then the profile is oriented to the XY plane the same at both ends. But if the profile gets swept freeform, the end profile is rotated. I want to know if I can get info on this angle in a script. Any ideas?angle_of_twist.3dm (234.7 KB)