Create each five types of regular polygedrons at once. (credit post)
Create a dual-polyhedron from given regular or semi-regular polyhedrons. (credit post)
Merge overlapped curves to unique ones.
Split a geometry by multiple tools at once, even if the order of tools is not organized.
Return both lists of valley & mountain vertex as points from supplied closed PolyCurve.
Distinguish whether supplied curve is straight line or not. Return true if it is a line.
Create a regular star shaped PolyCurve. Keep in mind that a star should have more than 5 mountain vertexes. (credit post)
Create chained sublists from a list. It's useful when you want to create separated curves or surfaces from a continuous list of points or curves.
Create PolyCurve if there are chained curves. Leave curves if there is no chained one with. Return a list contains both curves. I created this because the original node, PolyCurve.ByJoinedCurves works only for a list with all-chained curves.
Created a PolySurface from given topography of Revit. (credit post)