In the attached file there are two elliptical tubes, made by using Sweep 1 Rail, (the curves used are there with one of the tubes). Then the original tube was mirrored. The strange and frustrating thing is that the tube spirals slightly as it rises. If you find the Length of lines 1a and 1b they are equal, but 2a and 2b are different. This screws up my project and/but also seems like it shouldn’t happen??
Nick
twist.3dm (144.7 KB)
Hi Nick- copy the ellipse to the top of the path and use both as inputs to the sweep- does that do what you want?
-Pascal
Yes that straightens things out. BUT, why does it twist without 2 profiles? Is there some principle about how you use this command? Like 2 profiles are required?
I think that requiring roadlike right also helps in this case. I guess that "roadlike relative to one of the might be the solution in other cPlanes might be the way around not having multiple profiles?
Thanks,
Nick