Thank you for the reply. This works for simple polycurves, but the curves I am trying to turn into a surface is shown below (including curve points). These lines represent topography, so each one is at a different elevation than its neighbor. I get errors because the surfaces that would be created would intersect themselves. Are there nodes/functions to handle this kind of geometry?
I could use the lines to create a topo surface in Revit, but doing so would add to the size of the model. I’d rather maintain lines in Revit and have dynamo create the surface when needed.