闭路拓扑原理和欧拉公式是检验实体模型边界表示的拓扑与几何一致性的重要工具。
For inspecting topological and geometrical unanimity of a solid model, principle of closed path topology and Euler′s formula are important tools.
雕塑实体模型通过裁剪曲面片和半边数据结构来表达几何和拓扑信息。
The topology and geometry of solid is represented by trimmed curve surface and half-edge data structure.
根据结构实体几何法（CSG）建模思想，采用层次化、结构化的建模方法，构建了机床本体（包括刀具）模型；
On the basis of the idea of CSG modeling method, the hierarchical structural modeling method was adopted to construct machine(including tool)model.
特征技术是三维几何建模领域中继实体模型技术后的又一个重要里程碑。
Features 3d geometric modeling technology is the area of solid model relay technology is another important milestone.
所谓特征识别便非自产品的实体模型动身自动识别出其外具无一订工程意义的几何形状――便特征，入而地出产品的特征模型。
The feature recognition is the process in which geometric form with a certain engineering significance is extracted automatically from solid model, and then feature model is produced.
面向对象的地理信息模型以地理空间实体为对象，地理实体可以从几何数据、符号数据、实体数据、属性数据的角度来进行数据的组织。
A geo-spatial entity which can be organized from geometric data, symbol data, entity data, attribute data is regarded as an object to the object oriented geographical information model.
本文在对数字城市的研究体系和三维城市模型进行分析的基础上，着重对数字城市建筑物的构造实体几何(CSG)建模方法进行了研究。
On the basis of analysis of digital city research framework and existing 3d urban model, this paper researches mainly the techniques of building model based on CSG in digital city.
本文在对数字城市的研究体系和三维城市模型进行分析的基础上，着重对数字城市建筑物的构造实体几何(CSG)建模方法进行了研究。
On the basis of analysis of digital city research framework and existing 3d urban model, this paper researches mainly the techniques of building model based on CSG in digital city.
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