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复杂几何模型动态视相关的简化 被引量:1
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作者 淮永建 郝重阳 +1 位作者 罗冠 张先勇 《西北工业大学学报》 EI CAS CSCD 北大核心 2002年第2期337-341,共5页
基于三角形网格边折叠的思想,提出了一种新的多边形简化算法以快速生成多层次细节的LOD模型。在析叠边的代价估计中,均衡考虑了多边形边的长度和多边形表面曲率影响;折叠边的顶点位置从折叠边的顶点中选取,既有助于保留了初始模型的形状... 基于三角形网格边折叠的思想,提出了一种新的多边形简化算法以快速生成多层次细节的LOD模型。在析叠边的代价估计中,均衡考虑了多边形边的长度和多边形表面曲率影响;折叠边的顶点位置从折叠边的顶点中选取,既有助于保留了初始模型的形状,又减少运算量,满足实时绘制的需求。在依据视点选择适当LOD模型时,采用了顶点 morphing技术光滑多边形模型,减少不同层次LOD模型转化时引起的图像‘跳跃’。在算法实现中,采用增强的多边形数据结构,并用一算例证明了算法的有效性。 展开更多
关键词 复杂几何模型 动态视相关 实时图形绘制 多边形模型简化 多层次细节模型 边折叠 顶点渐变
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OBJECT ORIENTED DATA MODELLING WITH APPLICATIONS TO CAD
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作者 应维云 傅向阳 周儒荣 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 1996年第2期69+63-68,共7页
An object oriented data modelling in computer aided design (CAD) databases is focused. Starting with the discussion of data modelling requirements for CAD applications, appropriate data modelling features are introdu... An object oriented data modelling in computer aided design (CAD) databases is focused. Starting with the discussion of data modelling requirements for CAD applications, appropriate data modelling features are introduced herewith. A feasible approach to select the “best” data model for an application is to analyze the data which has to be stored in the database. A data model is appropriate for modelling a given task if the information of the application environment can be easily mapped to the data model. Thus, the involved data are analyzed and then object oriented data model appropriate for CAD applications are derived. Based on the reviewed object oriented techniques applied in CAD, object oriented data modelling in CAD is addressed in details. At last 3D geometrical data models and implementation of their data model using the object oriented method are presented. 展开更多
关键词 computer aided design DATABASES data models object oriented data models complex objects geometrical models
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