![]() Other elements are the shell (a set of connected faces), the loop (a circuit of edges bounding a face) and loop-edge links (also known as winged edge links or half-edges) which are used to create the edge circuits.Ĭompared to the constructive solid geometry (CSG) representation, which uses only primitive objects and Boolean operations to combine them, boundary representation is more flexible and has a much richer operation set. A face is a bounded portion of a surface an edge is a bounded piece of a curve and a vertex lies at a point. A boundary representation of a model comprises topological components ( faces, edges and vertices) and the connections between them, along with geometric definitions for those components (surfaces, curves and points, respectively).
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