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boundary representation
In solid modeling and computer-aided design, boundary representation—often abbreviated as B-rep or BREP—is a method for representing shapes using the limits. A solid is represented as a collection of connected surface elements, the boundary between solid and non-solid.
== Overview ==
Boundary representation models are composed of two parts: topology and geometry (surfaces, curves and points). The main topological items are: ''faces'', ''edges'' and ''vertices''. 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. 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. The edges are like the edges of a table, bounding a surface portion.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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