Boundary representation
= Boundary representation
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= B-rep
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A <boundary representation> specifies a solid through its oriented bounding faces and their edge and <vertex of a polyhedron> incidence. Supporting <planes> and <coordinates> supply geometry; face loops and adjacency supply topology. A valid closed manifold model requires compatible orientation, two incident faces per edge and a single local fan at each <vertex of a polyhedron>, together with an embedded boundary.