【摘要】 为了设计一个适用于产品外形设计的系统,文中重点对曲线曲面造型模块进行了研究,在NURBS曲线曲面造型模块中融入了实体造型的功能,设计了便于扩充和维护的曲线曲面类层次结构,并讨论了曲面造型模块的应用流程,通过与数据导入导出功能的衔接实现了与其它造型软件之间的数据共享,提高了系统造型效率,缩短了产品设计周期。在内核的显示模块设计中,提出了一个包含两个显示链表的显示类结构,用以加快图形对象的显示速度。更多还原

【Abstract】 This paper deals with the designing of the curve and surface modeling for a product shape system,which integrates NURBS curves/surfaces and solid modeling modules.A lot of hierarchical classes for curves and surfaces are put forward for the convenient of extension and maintenance,and also a practical procedure is discussed in this system.Data sharing is achieved with the link of data importing and exporting to improve the efficiency and to shorten the periods of production designing.In the displaying modules,a displaying class consisting of two display link lists is designed to show graphical objects rapidly.更多还原