通过分析单义域几何与拓扑特征确定交点域。
Analyzing geometry and topology features of Primitive regions, we can get the intersection regions which imply adjacency among them.
提出了将虚拟装配中的产品属性与行为信息分为产品层、特征层、几何拓扑层以及显示层。
The product attribute and behavior information in virtual assembly is stored in a hierarchy of product, feature, geometry & topology and display levels.
使用现有的产品数据表达与交换标准STEP只能描述CAD模型几何、拓扑和部分运动学信息，对多刚体动力学特征的描述一直是特征模型中的一个空白。
But there are only basic info of geometry, topology and partial kinematics in the CAD model in STEP. The description on feature of multi-rigid-body dynamics is hardly blank.
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