- 4 x Number- Integer Slider- 2 x Points. ByCoordinatesFrom the the “Range” Node we can get a set of points which will be incorporated to represent the start and end points. As the end points are composing a straight line we will use them as they are. But the start points are composing a Sin wave shaped curve so we need to convert their Y values first to degrees and hence use them as values to the angle input in the “Math.Sin” Node. Once we got the set of start points and end points we will use the “Line.ByStartPointEndPoints” Node to create the lines which will be used to create the surface. The “Surface.ByLoft” Node will create the surface based on the supplied lines by lofting. Final step is to import the geometry into Revit and this is done by using the “ImportInstance.ByGeometries” Node. The dynamo workflow can be downloaded from here