GB/T 16656.513-2004 in English

《GB/T 16656.513-2004工业自动化系统与集成 产品数据表达与交换 第513部分:应用解释构造:基本边界表达》由TC159（全国自动化系统与集成标准化技术委员会）归口，TC159SC4（全国自动化系统与集成标准化技术委员会工业数据分会）执行，主管部门为中国机械工业联合会。
GB/T16566的本部分详述了定义基本边界表达模型的通用资源的解释。以下内容属于GB/T16656本部分的范围：――elementary_brep_shape_representation(基本边界表达形状表达)的定义。它是由一项或多项manifold_solid_brep(流形实体边界表达)所组成的表达，每个manifold_solid_brep都是采用基本几何和完整的显式拓扑定义的；――应用于这种B-rep(边界表达实体模型)的面定义中的曲线和曲面的无边界几何定我；――B-rep模型拓扑结构的定义；――3D(三维)几何；――B-rep(边界表达实体模型)；――属于直线或二次曲线的基本曲线；――elementary_surface(基本曲面)；――几何变换；――polyline(折线)；――无边界几何；――边界几何实体的拓扑应用。以下内容不属GB/T16656本部分的范围：――2D(二维)几何；――除polyline外的有界曲线；――有界曲面；――偏置曲线和偏置曲面。

Scope

This part of GB/T 16656 details the interpretation of general resources defining the basic boundary representation model. The following contents belong to the scope of this part of GB/T 16656: ——The definition of elementary_brep-shape-representation (; basic boundary expression shape expression). It is an expression consisting of one or more manifold_solid_breps (manifold solid boundary expressions), each manifold_solid_brep is defined using basic geometry and complete explicit topology; Unbounded geometric definition of curves and surfaces in the surface definition of B-rep (boundary representation solid model); ——8—definition of topological structure of rep model; ——3D (three-dimensional) geometry; ——Brep (boundary representation solid model ); ——Elementary curves belonging to straight lines or quadratic curves; ——elementary_surface (basic surface); ——Geometric transformation; ——Polyline (polyline); ——Unbounded geometry; ——Topological application of boundary geometric entities. The following contents do not belong to the scope of this part of GB/T 16656: - 2D (two-dimensional) geometry; - Bounded curves other than polylines; - Bounded surfaces; - Offset curves and offset surfaces. This AIC is independent of any industrial application domain.