In the process of surface offsetting based implicit surface method, the spatial data block sampling technique using octree data structure, vertices mapping technique based on Newton 'iteration method and the original topology relation of the discrete model are used. 采用了八叉树空间分块进行数据点采样,以及顶点映射结合原始模型拓扑关系来生成网格化隐式等距曲面,并通过实例分析了两种等距算法的优缺点以及适用范围。