I replaced the Pipe with an elliptical cross section that twists based on distance from centerline. Not bad but doesn’t match some artistic details of Tom Lawton’s sculpture.
In a different version, I’m exploring the Z coordinate of each perp frame (cross section), so it is flatter at top and bottom and steeply banked at the vertical middle. I’d rather avoid the complexity encountered in a recent thread, banking a figue-8 ramp.
