Paper Info
Title
Fast, Sub-pixel Antialiased Shadow Maps
Abstract
Solving aliasing artifacts is all essential problem in shadow mapping approaches. Many works have been proposed, however, most of them focused on removing the texel-level aliasing that results from the limited resolution of shadow maps. Little work has been done to solve the pixel-level shadow aliasing that is produced by the rasterization on the screen plane. In this paper, we propose a fast, sub-pixel antialiased shadowing algorithm to solve the pixel aliasing problem. Our work is based oil the alias-free shadow maps, which is capable of computing accurate per-pixel shadow, and only incurs little cost to extend to sub-pixel accuracy. Instead of direct supersampling the screen space, we take facets to approximate pixels in shadow testing. The shadowed area of one facet is rapidly evaluated by projecting blocker geometry onto a supersampled 2D occlusion mask with bitmasks fusion. It provides a sub-pixel occlusion sampling so as to capture fine shadow details and features. Furthermore, we introduce the silhouette mask map that hunts visibility evaluation to pixels only oil the silhouette, which greatly reduces the computation cost. Our algorithm runs entirely oil lite GPU, achieving real-time performance and is an order of magnitude faster than the brute-force supersampling method to produce comparable 32x antialiased shadows.
Year
DOI
Venue
2009
10.1111/j.1467-8659.2009.01571.x
COMPUTER GRAPHICS FORUM
Keywords
Field
DocType
shading,shadow mapping
Computer vision,Shadow,Computer graphics (images),Computer science,Silhouette,Shadow mapping,Aliasing,Supersampling,Artificial intelligence,Pixel,Shadow volume,Computation
Journal
Volume
Issue
ISSN
28.0
SP7.0
0167-7055
Citations 
PageRank 
References 
12
0.71
16
Authors
5
Name
Order
Citations
PageRank
Minghao Pan11326.00
Rui Wang248933.21
Weifeng Chen3151.79
Kun Zhou43690159.79
Hujun Bao52801174.65