Indicated wetcher the halfedge is a boundary (i.e. no connected face but twin has a face)
Indicates whether the halfedge is free (i.e. no connected face)
Returns a generator looping over all the next halfedges
Returns a generator looping over all the previous halfedges
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Returns true if the halfedge is concave, false if convexe. IMPORTANT: Returns false if halfedge has no twin.