基于压缩体素模型的快速成型直接切片算法

Direct slicing algorithm based on compressed voxel model for rapid prototyping

基于STL文件模型的间接分层切片算法存在缺乏拓扑信息,面误差诊断修复困难等问题,结合压缩表示形式的体素模型特点,提出了一种新的基于压缩体素模型直接切片分层优化算法。该算法利用Dexel模型记录的Dexel射线和物体交点所表达的物体表面点位置,通过设定分层平面厚度等参数获得截面轮廓数据,生成可直接适用于快速成型系统的共用层接口CLI文件。该算法在虚拟油泥造型系统中得到了应用,实验结果表明算法稳定、分层效果良好。

The indirect slicing algorithm, based on STL format files, has many limitations to represent logical information and accurate surface of a CAD model. According to the advantages of the compressed voxel model, a new direct slicing algorithm was introduced. The point coordinates, located on the surface of a CAD model, which were extracted from the crossing points between Dexel rays and 3D object model and recorded in the Dexel data structure. The slicing layers could be generated with those limitrophe points with other parameters defined by the user, such as layer depth. In the light of common layer interface file format, the optimized section profile data were written into a file that could be immediately used in the rapid prototyping system. The algorithm had been applied to the virtual clay modeling system, and integrated as a file interface. The test results show that it is a robust algorithm and has a satisfied performance.