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:
at the start the cross curve is parallel to the curve 's Normal, later it looks like a arbitrary Rotation.
Thanks for some info, that explains this result.
Sweep1_Freeform.3dm (47.0 KB)