关键词: 三维模型分类, 法向算子, D2算子, 特征描述符, 铸件三维模型

Abstract: In order to solve the problems of historical process reuse of the same casting types in casting productions, an algorithm of casting 3D model classification combining normal operator and D2 operator was proposed herein. In this method, the normal operator and D2 operator feature descriptors of the 3D models were extracted from the surface features and point feature information of the 3D models. The 3D model classification was realized by measuring the similarity between the casting feature descriptors and the basic feature descriptors of each category. The experimental results of the casting model library actually produced by companies show that the classification algorithm combining the normal operator and the D2 operator has a good feature recognition effectiveness for the common categories of castings, and solves the defects of feature insensitivity when D2 operator is used as a pre-classifier to deal with part of complex models, and may obtain classification results with higher accuracy.

Key words: 3D model classification, normal operator, D2 operator, feature descriptor, 3D model of casting