快速成型中二维层片信息重建技术

摘要

Rapid prototyping technolony has two steps,decomposing three-dimensional (3D)CAD model and constituting two-dimensional (2D )layer. The information combination in 2D layer is essential for it. Using the development tools of ObjectARX offered by Autodesk Inc, the information of 2D boundary processing after CAD model slicing is described.The closed loops make up of 2D contours. The Linear entity from end to end constitute a loop ,which has rotation direction.Based on which,the information of 2D boundary reconstruction is implemented,making the model analysis more convenient.%快速成型包括三维模型的分解过程和二维层片的组合过程,二维层片的组合是快速成型技术必要的实现过程.通过ObjectARX二次开发接口,将三维CAD模型切片后的二维层面进行信息处理,完成层片轮廓线由闭合环构成,环由首尾相接的有向线性实体构成,并判断出环的旋转方向,实现了二维层面信息的重构技术,使模型分析更为简便.