Can anyone tell me how best to model what I have described as a spiral tube. To imagine the shape I mean, first imagine a standard helical corkscrew. If you took a vertical section through that, the circular rod section that forms it would become an ellipse. But suppose you wanted it to be a rectangle instead. What you would end up with is something like the spiral you get when you peel an apple.
But as you can also see, the segments are not vertical. I want to end up with a shape that looks as if it has been cut out of a tube.
Any ideas? (This is probably @mihai.s territory).