基于Shadow Maps的实时阴影生成算法改进  

An Improved Shadow Maps Algorithm for Real-time Rendering

作　　者：张伟[1] 奚俊峰[1] 

机构地区：[1]兰州交通大学机电技术研究所,甘肃兰州730070

出　　处：《兰州交通大学学报》2011年第1期22-26,共5页Journal of Lanzhou Jiaotong University

基　　金：甘肃省自然科学基金(0916RJZA045)

摘　　要：为了在三维动画场景中实时生成更逼真的阴影,分析了Shadow Maps阴影生成算法走样和失真问题的原因.采用平均分割与对数分割相结合的方法改进了透视走样问题,采用双阴影图法改进了自阴影绘制问题.在Windows XP环境中,基于Open GL库,编程实现了Shadow Maps算法改进.实验表明,在目前流行的硬件配置环境下,改进后的算法在阴影生成过程中能满足实时渲染帧率要求,同时增强虚拟场景阴影质量.To build vivider shadows for real-time rendering in three-dimensional animation,Shadow Maps algorithm is studied and improved.By taking main value of average segmentation and logarithmic segmentation as the parameter to divide the shadow scene,the perspective aliasing is relieved.And by building and buffing the shadow maps twice with proper offset,the shadow acne,which caused by self-shadow error,is cleared up.The improved algorithm is implemented based on OpenGL with common graphic hardware and Windows XP.It＇s shown that the algorithm can build high quality shadows with satisfying the demand of the real-time rendering.

关 键 词：SHADOW Maps算法 三维仿真 实时绘制 

分 类 号：TP37[自动化与计算机技术—计算机系统结构]