基于ET算法的STEP三维实体模型向二维工程图的数据转换

An ET Algorithm_based Data Conversion from 3D Models to 2D Drawings

介绍了基于STEP文件 ,由形体三维边界表示法数据模型向二维工程图数据转换工具的结构和ET算法 .采用该工具可实现由三维图向三视图的变换 ,自动完成由实体模型生成二维工程图的处理 .ET算法是将基于Brep的三维STEP文件 ,采用正投影变换、消隐技术和基本图形变换等技术 ,完成从AP2 0 33D(Brep)到AP2 0 1基本视图的转换 .算法中还给出了隐线在三视图中的虚线化处理方法 ,解决了采用消隐法生成工程图的虚线处理问题 .采用该算法的转换工具已经开发研制成功 。

The conversion from model data into 2D drawing data, based on STEP files, was introduced in this paper. The 3D model pictures can be converted to the three_view drawings, and the process can be implemented automatically. The ET algorithm is to convert the Ap203 3D(Brep) models to Ap201 basic view drawings by using quadrature projection transformations, removing techniques and basic graphics transformations, And a method that can implement the hidden line elimination and hidden line dashlization is given also, so as to generate dash lines in drawings. The converter has been developed and passed the test.