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High‐Quality Adaptive Soft Shadow Mapping
Author(s) -
Guennebaud Gaël,
Barthe Loïc,
Paulin Mathias
Publication year - 2007
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/j.1467-8659.2007.01075.x
Subject(s) - rendering (computer graphics) , shadow mapping , computer science , computer vision , computation , artificial intelligence , shadow (psychology) , frame rate , computer graphics (images) , aliasing , algorithm , filter (signal processing) , psychology , psychotherapist
Abstract The recent soft shadow mapping technique [ GBP06 ] allows the rendering in real‐time of convincing soft shadows on complex and dynamic scenes using a single shadow map. While attractive, this method suffers from shadow overestimation and becomes both expensive and approximate when dealing with large penumbrae. This paper proposes new solutions removing these limitations and hence providing an efficient and practical technique for soft shadow generation. First, we propose a new visibility computation procedure based on the detection of occluder contours, that is more accurate and faster while reducing aliasing. Secondly, we present a shadow map multi‐resolution strategy keeping the computation complexity almost independent on the light size while maintaining high‐quality rendering. Finally, we propose a view‐dependent adaptive strategy, that automatically reduces the screen resolution in the region of large penumbrae, thus allowing us to keep very high frame rates in any situation.