Curve features/operations

Hey, I would like the following features/operations regarding curves to be implemented.

  • Derivative curve: It would be really helpful if we could get the derivative (or a granular slope value) from a given curve. This would allow for nice automation regarding the widths of a river, for example: Becoming wider near turns (high slope) and becoming thinner when the river is near straight.
  • Absolute curve: Kind of like the inverse curve, except it will only invert negative values. This will ensure a curve will always have a positive value, though it can lead to some strange results/kinks in the curve when it flips negative to positive.
  • Normalise curve (between): Just like the normalise action of the clamp device, taking the the section of the curve and ensuring the highest value is x and lowest value is y. Since curves can go negative, I think it is best to let the user decide the values of x and y.
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