2 rail sweep sections aligenement

Hi, I’m trying to sweep 3 profiles along 2 groups of rails, however, I can’t figure out how to align the 3 sections (I can if i loft them and tick the ‘curve alignement’ in loft options).
How does one do that in a 2rail sweep with open curves? ATM the mid section is ‘twisting’ the sweep.

2 rail sweep provile alignement.gh (29.5 KB)

Many thanks

Unify your rail and profile curve directions first. They are mess…

2 rail sweep provile alignement_re.gh (38.0 KB)

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I see, great, thanks!

there’s one thing i don’t quite get, after you flipped the rails in the right direction, why do you merge them to then list them? Could you just input them into the sweep and graft it there? Does it make any difference?

Doing as you say is a simpler way to look at it. Put it that way if you like. BTW, one thing you should consider is that simple is not always a good thing when if you want to get editorial freedom.

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fair enough, just wanted to make sure I wasn’t missing sth.
thanks again.