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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 ,并通过了测试
This paper introduces the structure and ET algorithm based on STEP file from the three-dimensional boundary representation data model to the two-dimensional engineering data conversion tool.It can realize the transformation from three-dimensional graph to three-dimensional graph and auto-complete the two-dimensional Engineering drawing.ET algorithm is Brep based on the three-dimensional STEP file, using orthographic projection transformation, blanking techniques and basic graphics transformation techniques to complete the conversion from AP2 0 33D (Brep) to AP2 0 1 basic view. Also given the hidden line in the three views of the dotted line processing method to solve the problem of using dashed line to create a drawing of the dashed line processing.A conversion algorithm using the algorithm has been developed successfully and passed the test