1/11/2024 0 Comments Modelio structureIn Finland, Martti Mäntylä produced a solid modelling system called GWB. Parasolid and ACIS are the basis for many of today's commercial CAD systems.įollowing Braid's work for solids, a Swedish team led by Professor Torsten Kjellberg, developed the philosophy and methods for working with hybrid models, wire-frames, sheet objects and volumetric models during the early 1980s. Braid worked on the commercial systems ROMULUS, the forerunner of Parasolid, and on ACIS. Braid continued his work with the research solid modeller BUILD which was the forerunner of many research and commercial solid modelling systems. Baumgart at Stanford (for computer vision). Braid in Cambridge (for CAD) and Bruce G. The basic method for BREP was developed independently in the early 1970s by both Ian C. In addition to the Boolean operations, B-rep has extrusion (or sweeping), chamfer, blending, drafting, shelling, tweaking and other operations which make use of these. 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 constructive solid geometry 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 solid is represented as a collection of connected surface elements, which define the boundary between interior and exterior points.Ī 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). In solid modeling and computer-aided design, boundary representation (often abbreviated B-rep or BREP) is a method for representing a 3D shape by defining the limits of its volume.
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