Loops
A loop represents a connected portion of the boundary of a face. It consists of a set of coedges linked in a doubly-linked chain which may be circular or open-ended.
If either end of an open-ended loop is at a finite point, then the face containing the loop is necessarily incomplete. If either end is at infinity, then the face is infinite.
The following figure contains three closed loops. Each loop is the boundary of a complete, finite face. In the actual physical structure, the adjacent parallel lines are coincident.
Figure. Loops of Edges
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