Help needed for Sweeping a Rectangle profile

[Tom_P]

@RodolfoSantos

force the profile to remain perp from the rail in one dir.

just wanted to add, that the sweep commands somehow handle the
the framestyle in an unexpected way: see this post:

Sweep1 Framestyle Freeform

hallo at @pascal or all others: what is the background of _sweep1 Framestyle = Freeform ? (the option Framestyle = Roadlike is well explained in the help-files) What is the background / how is the rotation of the cross curve defined - for Freestyle ? I always thought, there is some relation between the unit tangent, normal and Bi-normal / osculating plane / Frenet-Serret-Frame. But the following simple example doesn’t look like the the cross curves follows the osculating plane: [06] at t…

please also notice, that the normal of the spiral is not pointing in the same direction as the normal of the (virtual enclosing) surface…

Osculating plane

a spiral has torsion, so the resulting surface will also have torsion !