Solid modeling in GEMS 4.0

Changgui Yang; Yujian Chen; Gang Fan; Jiaguang Sun

doi:10.1117/12.235574

22 March 1996 Solid modeling in GEMS 4.0

Changgui Yang, Yujian Chen, Gang Fan, Jiaguang Sun

Proceedings Volume 2644, Fourth International Conference on Computer-Aided Design and Computer Graphics; (1996) https://doi.org/10.1117/12.235574
Event: Fourth International Conference on Computer-Aided Design and Computer Graphics, 1995, Wuhan, China

Abstract

A product modeling system GEMS 4.0 has been implemented, in which feature representation is used at the highest level abstraction of a product model, boundary representation is used at the bottom level, while CSG model is adopted at the median level. A BRep data structure capable of modeling non-manifold is adopted. NURBS representation is used for all curved surfaces. Quadric surfaces have dual representations consisting of their geometric data such as radius, centerpoint, and center axis. The geometric data are not only necessary for the mapping of form features of the corresponding CSG models, but also useful for accelerating certain time consuming calculations such as surface-surface intersections. Boundary representation of free form surfaces are easily built by sweeping and skinning method with NURBS geometry. Set operations on curved solids with boundary representation are performed by an evaluation process consisting of four steps: intersection, construction, classification and selection.

Citation Download Citation

Changgui Yang, Yujian Chen, Gang Fan, and Jiaguang Sun "Solid modeling in GEMS 4.0", Proc. SPIE 2644, Fourth International Conference on Computer-Aided Design and Computer Graphics, (22 March 1996); https://doi.org/10.1117/12.235574

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