Descending Sine on Curve?

[MJD]

How do we modify this script so a curve can be selected rather than be generated?

How to parametrize a sine curve

I am new to grasshopper and I am looking for some help to build a curve similar to the photos I have attached. These photos I have easily made using Rhino. With grasshopper I was able to parametrize the points on the circumference by dividing into angles and finding connecting intersections. Now my question is how to move up and down with positive and negative values( z axis) the points in a specific dimension size and find the same points that I had found with rhino. I want to interpolate the p…

[PeterFotiadis (Pfotiad0)]

See attached

VarSinCrv_V0.gh (122.7 KB)