Made a helicoid node.
The v curves made with the stock Curve factory to not pass through the helical points.
The convertPts2 node uses MoI's Interpcurve factory so the curves pass through the points.
Max's Curve node has other versions of Interp., but the u and v points are not separated for inputs...

If network does not create the surface, or takes too long, a radial curve may be swept along the inner and outer helical curves.

- Brian

Javascript cosh(x) and sinh(x) are not part of ecmascript5.