%0 Journal Article
%T Advanced Geometric Modeler with Hybrid Representation
%A Yang Changgui
%A Chen Yuian
%A Sun Jiaghang
%A <br>Yang Changgui
%A Chen Yuian
%A Sun Jiaghang
%J 计算机科学技术学报
%D 1996
%I 
%X An advanced geometric modeler GEMS4.0 has been developed, in whichfeature representation is used at the highest level abstraction of a productmodel. Boundary representation is used at the bottom level, while CSG modelis adopted at the median level. A BRep data structure capable of modelingnon-manifold is adopted. NURBS representation is used for all curved surfaces.Quadric surfaces have dual representations consisting of their geometric datasuch as radius, center point, and center tals. Boundary representation of freeform surfaces is easily built by sweeping and skinning method with NURBSgeometry Set operations on curved solids with boundary representation areperformed by an evaluation process consisting of four steps. A file exchangefacility is provided for the conversion between product data described by STEPand product information generated by GEMS4.0
%K Product modeling
%K solid modeling
%K boundary representation
%K CSG
%K set operation
%K STEP<br>CAD
%K 几何模型
%K 混合表示
%K 命令信号发生器
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=F57FEF5FAEE544283F43708D560ABF1B&aid=2E8749F564561FFE8BAAF83EE4F38F26&yid=8A15F8B0AA0E5323&vid=708DD6B15D2464E8&iid=CA4FD0336C81A37A&sid=CA4FD0336C81A37A&eid=5D311CA918CA9A03&journal_id=1000-9000&journal_name=计算机科学技术学报&referenced_num=0&reference_num=2