what do you mean by XY? there’s no XY anymore, just parallel to the input line and perpendicular to the input line
maybe you want to invert the direction of the perpendicular curve?
in that case you can just invert the direction of the rotation axis the second vector is rotated around (or even better just use cross product)
To me that seems correct - The input is presumably the blue line as you say and the output the dashed construction lines? The shorter construction line (3000mm) is along the input line as it should. Or am I still confused?
I think Inno has different values on the sliders (624 - 271) from yours (3000 - 8000), you’d just need flip the values or increase the length of the topmost slider to make that one the long line and then it would match up with what you see in Inno’s pic.