BSpline BRep Wires
A wire is a sequence of linked edges used to trim off parts of a face to create holes or external boundary. A wire is a property of its owner face. Wires are not shared. Edges, on the other hand, are shared by wires of adjacent faces.
A wire keeps a list of its vertices accessed via IBRepWire_DG.GetVertex(). Vertices in this list are listed in counter clock wise direction of the owner face (looking from outside).
Wires in a valid shape are always closed (define a loop). Wires can also be created standalone (to define a curve, etc.), in which case they can be open.
Ignoring individual orientation, edges are also listed in Counter Clock Wise sequence of the owner face.
Edges in a wire are linked: Two consecutive edges always share an end vertex.
A wire can consist of a single closed edge. The vertex list in the case consists of a single vertex.
See also: BRep Edges, BRep Faces, Shape Explorer Sample
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