The method that avoiding repeatedly reading a triangular facets information is proposed by studying the redundant data of STL file and the index relation is built up by the 6 r z coordinates of triangular facets .

研究了STL 文件 读取时的冗余数据，提出了避免多次重复读取同一个 三角面片信息的方法，并通过三角面片顶点的θ，r，z坐标在各三角面片之间建立起了索引关系。