摘要： 提出了利用正多面体顶点分布来剖分球面，得到球面上物体的投影点，利用这些投影点得到物体的二维投影。这种二维投影的获取方式具有投影点分布均匀的特点，并且根据三维物体的特点对特定区域的投影点进行加密，以获取更多的二维投影信息。该方法已经应用到三维模型及三维动作的识别中，取得了良好的效果。

关键词: 正多边形, 三维模型, 投影

Abstract: This paper proposes the method of using equilateral polygon to subdivide the surrounded spherical surface, so as to obtain the projection point and get the two-dimensional projections of 3D models. This method can gain even projection point, and carry on the encryption process to the specific region according to the 3D model’s characteristic, so as to gain more two-dimensional projections information. The method proposed in this paper has already applied in the 3D model recognition and 3D motion recognition work, and obtained good result.

Key words: Equilateral polygon, 3D model, Projection