I followed the instructions in a tutorial, and it worked for one air-duct, but not another, even though the two are almost identical in setup. The tube tends to twist along the curve, I don’t know why. In the image below you’ll see a horizontal tube with a rectangular section at one end and a flat elliptical section at the other end. That’s the straight master tube I use for the two cooling air ducts. But although the tube on the left worked out well, the one on the right has ugly deformities.
And if I switch to Edit mode, where the modifier is not enabled, the mesh appears near the straight master tube without following the curve, but still with deformities.
This is what my paths look like:
Though, I just notice, the tube on the left seems to have subdivision, while the one on the right doesn’t… I’m confused…
EDIT: Yeah, never mind the confusion. What happened is that after my left side tube was working well I applied it, then added subdivision, whereas the tube on the right never worked so it is still a curve modifier. But so my question is still why is it not working, and why does the tube seem to twist?