工业自动化系统和集成 产品数据表示和交换 第502部分:应用解释构造:基于壳的线架

[中文适用范围]： ISO 10303 的这一部分指定了对集成资源的解释，以满足使用由一组壳界定的三维线框模型表示产品形状的要求。 以下内容属于 ISO 10303 本部分的范围： ——由边和顶点图描述的线框模型的表示，其中边仅在其顶点处相交； ——线框模型由一个或多个壳表示，除了其顶点或边缘外，壳不应重叠或相交； ——三维坐标空间中定义的点； ——在三维坐标空间中定义的曲线，包括 B 样条曲线； ——单个线框模型或线框模型组合的表示。 以下内容超出了 ISO 10303 本部分的范围： ——二维坐标空间中定义的几何形状； ——表面几何形状； ——立体几何； ——对消除结构的引用。 [外文原描述]： This part of ISO 10303 specifies the interpretation of the integrated resources to satisfy requirements for the representation of the product shape using three-dimensional wireframe models which are bounded by a set of shells. The following are within the scope of this part of ISO 10303: — the representation of wireframe models that are described by a graph of edges and vertices where the edges intersect only at their vertices; — the representation of a wireframe model by one or more shells that shall not overlap or intersect except at their vertices or edges; — points defined in a three-dimensional coordinate space; — curves, including b-splines, defined in a three-dimensional coordinate space; — the representation of a single wireframe model or an assembly of wireframe models. The following are outside the scope of this part of ISO 10303: — geometry defined in a two-dimensional coordinate space; — surface geometry; — solid geometry; — references to eliminated constructs.