Grasshopper

algorithmic modeling for Rhino

Hi I'm a novice of grasshopper and I'm trying to create an unduloid form. I created something similar but I found some problem to roll the ellipse, someone can help me? 

This is the definition of an unduloid: In geometry, an unduloid, or onduloid, is a surface with constant nonzero mean curvature obtained as a surface of revolution of an elliptic catenary: that is, by rolling an ellipse along a fixed line, tracing the focus, and revolving the resulting curve around the line.


https://en.wikipedia.org/wiki/Unduloid

And in this file there is a short video:
http://www.mathcurve.com/courbes2d/delaunay/delaunay.shtml

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