I have imported a prefab from unity that looks like this.
It is a track for a roller coaster.
I want to twist it about the axis in between them such that it forms a roller coaster path like this.
I can't figure out how to twist it, both along its own axis, and also along another axis such that it forms a loop, as shown in the roller coaster figure. I thought that making a parent empty object (Plane Axes) and twisting it would solve the problem, but the Empty object doesn't seem to have modifiers, so I can't even add a twist to that object.