【摘要】 本文阐述了在 CAD 图形学领域,通过几何造型得到以 CSG 描述的几何形体,直接产生其线框图的算法及用此算法研制的软件 CWIRE 的内部结构及其应用。软件 CWIRE 产生线框图的基本思想在于抽取形状段的边界描述信息以及进行边界线段和形状段的集合运算。在隐藏线消除算法中,充分利用已形成的边界信息,并和形体的 CSG 信息一起完成隐藏线的消除。更多还原

【Abstract】 In the CAD graphics area,the algorithm which directly creats the wireframe picture of a ge- ometric shape,which is obtained through solid geometric modelling and described by CSG scheme, as well as the inner structure of the software CWIRE developed with this algorithm and the application of CWIRE are investigated in this paper.The basic idea of CWIRE creating wire-frame picture is abstracting boundary representation information of shape segments and proceeding the regular set operation between line segments and shape segments.During eliminating the hidden line,we must use CSG information because of no complete face information,also we make full use of boundary information to speed the process.更多还原