This function is a binary Curve operator: It takes two Curves as arguments
and returns a new Curve. The two Curves are combined by using the full first
Curve for the first portion of the result and by using the full second Curve
for the second portion of the result. The second Curve is not changed, and
therefore there might be a big jump in the middle of the result Curve.
This function is a binary Curve operator: It takes two Curves as arguments and returns a new Curve. The two Curves are combined by using the full first Curve for the first portion of the result and by using the full second Curve for the second portion of the result. The second Curve is not changed, and therefore there might be a big jump in the middle of the result Curve.