MOM-PO混合方法中一种遮挡消影的新算法  

New method for removing the hidden face in the MOM-PO hybrid method

作　　者：党晓杰[1] 袁浩波[1] 王楠[1] 梁昌洪[1] 

机构地区：[1]西安电子科技大学天线与微波技术重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2012年第1期38-41,共4页Journal of Xidian University

基　　金：国家自然科学基金资助项目(61072018;60901030);中央高校基本科研业务费资助项目(JY10000902002)

摘　　要：在矩量法与物理光学方法混合时,需要准确快速地判断PO区域在点光源照射下的亮区和暗区,为此构造了一种高效率的遮挡消影算法.首先改进常用的Z-Buffer算法,将其用于对所有三角形面片进行分组,以降低计算量;然后在每组内采用一种严格的算法进行遮挡判断,以保持计算精度;最后采用区域分解方法来降低内存需求.具体的数值实验表明,该算法在维持内存量和计算时间基本相当的前提下,精度比Z-Buffer算法提高了18.6%.It is necessary to judge the lit region and the shadow region in the PO area when we use the MOM-PO hybrid method.This paper proposes a highly efficient method to complete this hidden face removal.First of all,it divides all the triangles in the geometric model into groups by the commonly-used Z-Buffer method,thus decreasing the time-expenditure.And then a strict method is adopted to find the lit triangles with high accuracy.Finally,we apply the domain decomposition method to decrease the memory requirement.A numerical experiment shows this new method can obtain a more accurate result than the Z-Buffer method by 18.6% at the expense of only a little more time and memory.

关 键 词：矩量法 物理光学 遮挡消影 区域分解 

分 类 号：TN011[电子电信—物理电子学]