Abstract: As an intuitive way for human-computer interaction, the interactive picking of 3D models is widely used in various fields, such as geometric modeling, 3D games, and finite element analysis. To address the problems of low picking efficiency and low degree of picking freedom of complex surface models, a fast and free interactive picking method for complex surface model was proposed. This method employed a brush-like tool to discretize the moving path of the brush in the screen, applied the single point picking method based on BVH structure to pick up the complex surface for each discrete point, and then utilized two hash structures to reduce the response time of the algorithm, and finally the algorithm was verified. 

Key words: graphic interaction, interactive picking, complex surface