一种改进的光源空间透视阴影图算法及其实现  

An Improved Light Space Perspective Shadow Maps and Its Realization

作　　者：陈大炜[1,2] 谢胜利[1] 

机构地区：[1]华南理工大学电子与信息学院,广东广州510641 [2]康佳集团研究院,广东深圳518053

出　　处：《系统仿真学报》2008年第S1期17-20,24,共5页Journal of System Simulation

摘　　要：阴影对于虚拟环境真实感也有着重要的影响。阴影图算法具有良好的灵活性和性能优势,非常适合在实时虚拟环境生成中应用。基于光源空间透视阴影图算法给出了一种更精确的潜在遮挡物凸包体的计算方法,提出了一个更优化的光源空间透视变换参数计算方法,并对原算法中没有涉及的投射走样问题进行了讨论。最后给出了一种可以较好的模拟出软阴影效果的方法。Shadow effects dramatically enhance the realism of virtual environments by providing useful visual cues.Shadow mapping is extensively adopted in real-time applications by its efficiency.A set of integrated real-time shadow method is put forward and realized in this paper,by improving and optimizing the light space perspective shadow algorithm,including a more accurate potential occluder convex and an optimized perspective transformation parameter.A method for better approximate soft shadow effect is also given at last.

关 键 词：阴影 阴影图算法 光源空间透视阴影图 虚拟环境 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]