三维模型空间占有体的描述及显示预筛选算法

MODELS IN THREE DIMENSIONS AND THE ALGORITHM FOR PRELIMINARY SIZING

本文用网状层次下的联系－实体（Ｅ－Ｒ）语义模型实现了对三维模型空间占有体的逻辑表示，然后用关系模型将Ｅ－Ｒ模型中的非规范化关系分解成关系范式，实现了相应的数据库算法以及模型的显示预筛选算法。

In this paper,we proposed an E R model to describe the volume of a 3D spatial model and found a way to translate from an E R model into a relationship model.Finally,we developed an algorithm for 3D graphic database and an algorithm of preliminary sizing for graph display.