P.S.: I think the manually drawn Spline-Segments are the best for a good art directing. It keeps a fair amount of control even with the dynamic set up from above.
The following is more about completing the discussion, as I believe it has enough potential to be mentioned here.
Example
https://www.amazon.com/clouddrive/share/Q3DV2PP2MrlDe93qfFVtwbLiwb2OGzkRZMtctclSPty
Background:
https://www.youtube.com/watch?v=DApBgfpHs2M
Enjoy your weekend.