How to not get twist when using sweep2

[Joseph_Oster]

@gandolphe.thomas

Indeed I looked up the forums before posting - could not find an relevant topic, do ou have one in mind that I missed and ould benefit from reading ?

I did this one a few days ago, a roadway tunnel in five sections:

Curve, perp frame and sweep1

What happened to @Tsai_totoro Going back to the original GH file in the first post, the tunnel sections are defined by sliders that use ‘t’ values, and more oddly, 1 is subtracted from all the slider values: [14004_orig] I’ve considered that a bad practice since my early days with GH because ‘t’ values change when Fit Curve or other rebuild curve methods are applied. So I’ve modified the code to use tunnel section lengths instead, which don’t change if the curve is rebuilt. [14…