Processing of Three-Dimensional Models for the Crystal Laser Engraving

With the development of crystal laser engraving technology and the improvement of the appreciation level of art works, the new customized 3D (three-dimensional) art expression of laser crystal engraving has received more and more attention. In this paper, we propose some 3D model processing methods for the crystal laser engraving. Firstly, to get densely vertices for laser engraving, we subdivide the mesh based on modified Butterfly subdivision method. Secondly, in order to keep distance of vertices not less than safety distance of laser engraving, we put forward a simplification algorithm suitable for laser engraving models, collapse edges which do not conform to the safe distance limit of the vertex. Finally, to show the rich details of the model by point cloud density, we propose the filtering algorithm of point cloud model based on multi-level error diffusion. Experiments show the proposed algorithms have higher practicability.