Would we ever have to flip edges for concave polygons? If we had to flip an edge across the concavity, it would go off the polygon e.g. a concave hexagon like so: https://sites.google.com/site/basicgeometricpolygons/_/rsrc/1468847241088/hexagon/Concave%20Hexagon.jpg

@liangcyn I believe that these types of concave polygons don't exist as primitive types in computer graphics for precisely this reason. Most often geometry is represented with triangle or quadrilateral meshes (or even point clouds). This way if the geometry isn't even in the system there is no way that the issue mentioned can even appear.

I think it would make more sense if this was called edge-rotate since that is what it would look like when applied to higher degree polynomials

(btw my question was answered by Kayvon on Piazza @217! Thank you to @sagoyal as well :D)