三维打印中的底层多边形优化

Underlying Polygon Optimization in Three Dimensional Printing

三维打印过程中,底层多边形模型存在着数据点冗余、形状粗糙等问题,造成模型成型效率低,表面模型不光滑,急需要对底层多边形进行优化.现有的多边形优化算法没有考虑到在三维打印过程从多边形转换为相应的加工指令及加工机构的平滑运行等问题.为此,本文提出一种新的底层多边形优化算法,该算法利用基于面积最小原则的多边形简化算法来减少多边形顶点数,再通过Hermrite曲线和B样条对多边形进行样条化处理,使多边形边界变得光滑,并对样条化后的多边形顶点进行均匀离散化,使优化后的底层多边形更便于机械指令集的操作.实验结果证明该算法可以提高底层多边形的质量并满足三维打印的工程要求.

The polygon which is used in the underlying digital model in the field of Three Dimension Printing has many problems, such as data redundancy and rough shape. These problems lead to the inefficiency of the product, and the surface model is not smooth. The existing optimization algorithm does not consider the problem of processing instruc-tions and smooth operation. To solve these problems, this paper presents a new polygon optimization algorithm, by using polygon simplification algorithm based on the rule of minimum area to reduce the number of vertices of polygons, and spline polygon based on Hermrite curve and B-spline to make polygon boundary becomes smooth. Then this algorithm can also discrete polygon vertices, make it easier to process. Experimental results show that this algorithm can improve the quality of underlying polygons and satisfy engineering requirements.