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. 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。
Math morphology, based on stochastic set theory, integral geometry, topology and modern algebra, is a subject for digital image processing and recognition. 数学形态学是以随机集论、积分几何、拓扑学、近代代数为基础的用于数字图像处理和识别的学科。
The product attribute and behavior information in virtual assembly is stored in a hierarchy of product, feature, geometry & topology and display levels. 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。
A hierarchy representation model ( HRM ) based on boundary representation ( B-rep ) is presented for collaborative design. Reconstruct the geometry, topology and feature of traditional CAD product data model based on HRM. 提出一种面向协同设计的基于边界表达的层次表达模型,利用该模型对传统CAD产品数据模型的几何、拓扑、特征进行重组。
On the other hand, known point cloud data, to achieve surface reconstruction, which involves computational geometry, topology, and computer graphics, and other fields of knowledge. 在已知点云数据的情况下,实现表面重建,涉及到计算几何、拓扑学、以及计算机图形学等多领域的知识。