I'm trying to do a coil with an ellipse profile. Both the coil and the cross section taper
But it needs guide rails, otherwise the cross section twists around before meeting the top oval. So I can do guide rails, but first error is they don't intersect the profile.
So I came up with the idea of putting a line through 2 points on the square coil profile that extends out and splits the ovals in two, then I would loft in 2 ops. Weird but that should make 2 rails- the diagonal corners of the square coil- that touch both profiles.
It looks logically solvable here, but I get a big yellow mess and "Rail cannot be tangent to profile". I don't see the problem- tangents shouldn't just be legal, they should be *mandatory* for this op.
Then I remembered I've been stuck on this before- I can make up anything for a cross section, and it could follow the coil's taper. That worked if the actual cross section didn't have to taper. I couldn't find any way to make two different cross sections loft together with the coil guides, even though this looks perfectly correct and maybe the only way to do it. But wouldn't work, not by any method I could find.
And I thought "hey maybe I should make a
Any help here?

Like then I tried to switch to a triangle profile and make a new guide triangle from one side of the coil to a centerline point on the ellipse. Planning to use the new triangle as a better guide. But, same problem. Says rails cannot be tangent to the profile??