practical hybrid pre-filtering shadow maps

	practical hybrid pre-filtering shadow maps
	Lv Weiwei; Liu Xuehui; Lu Jian; Wu Enhua
	2009
关键词	Antialiasing Algorithm Depth Texture Exponential Shadow Map Occlusion Value Prefiltering Algorithm Variance Shadow Map Antialiasing Filtering Theory Image Texture
摘要	Both exponential shadow maps and variance shadow maps arc efficient shadow maps anti-aliasing algorithms based on pre-filtering, but exponential shadow maps will cause light bleeding, float overflow and penumbra discontinuity problems and variance shadow maps also have serious light bleeding problem. All these prevent their individual use in practice especially in large virtual environment such as games. This paper presents a hybrid method by storing three values in the depth texture: depth, squared depth and exponential depth. From these values we calculate two occlusion values using exponential and variance shadow maps respectively. A minimum of the two occlusion values is taken as the final result. This can efficiently eliminate the problems of the two methods and can be widely used in practice.
部门归属	Lv, Weiwei; Liu, Xuehui; Lu, Jian; Wu, Enhua Chinese Acad Sci, Inst Software, Beijing, Peoples R China.
组织者	IEEE, Natl Nat Sci Fdn China, Zhejiang Prov
内容类型	学位论文
URI标识	http://ir.iscas.ac.cn/handle/311060/8238
专题	基础软件与系统重点实验室
推荐引用方式 GB/T 7714	Lv Weiwei,Liu Xuehui,Lu Jian,et al. practical hybrid pre-filtering shadow maps[D],2009.