阴影绘制中的PSSM与VSM混合算法  

Hybrid Algorithm of PSSM and VSM in Shadow Rendering

作　　者：刘松平[1] 肖德贵[1] 

机构地区：[1]湖南大学信息科学与工程学院,长沙410001

出　　处：《计算机工程》2015年第2期228-233,共6页Computer Engineering

基　　金：湖南省教育厅基金资助项目"基于多信息融合处理技术的交通隧道火灾检测研究"(13C270)

摘　　要：在三维阴影绘制中,平行分割阴影图(PSSM)算法存在第一个分割区域过小而导致锯齿现象的缺陷,方差阴影图(VSM)算法则会引起严重的光渗现象。针对以上不足,提出一种结合PSSM与VSM的混合算法。通过设置扩大系数解决PSSM算法首个分割区域不足的问题,加入模糊处理,重复渲染过渡区域,以减少边界锯齿现象,采用MRT技术减少VSM算法在渲染时引起的光渗现象。由分割方法、渐进方式、纹理大小及混合算法阴影图绘制效果等方面的实验结果表明,与PSSM等算法相比,该算法绘制的阴影图质量有较大提高。In three dimensional shadow rendering,the first segmentation area in Parallel Split Shadow Map（PSSM）algorithm is too small to result in aliasing phenomenon,and Variance Shadow Map（VSM） algorithm causes the serious phenomenon of irradiation.In view of the above,this paper proposes a hybrid algorithm based on PSSM and VSM.By setting the expanding coefficient to solve the first partition problem in PSSM algorithm,and adding fuzzy processing,repeated rendering transition region reduces boundary serration phenomenon.It uses MRT technology to reduce the irradiation induced VSM algorithm when rendering.Experimental results of the segmentation method,asymptotic test,texture size and hybrid algorithm of shadow map rendering effect and other aspects show quality of the shadow map is greatly improved compared with the PSSM algorithm,etc.

关 键 词：图像区域 平行分割阴影图 三维阴影绘制 混合算法 帧率 

分 类 号：TN911.73[电子电信—通信与信息系统]