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Title: Multi-resolution screen-space ambient occlusion
Authors: Hoang, T.-D.
Low, K.-L. 
Issue Date: 2010
Source: Hoang, T.-D.,Low, K.-L. (2010). Multi-resolution screen-space ambient occlusion. Proceedings of the ACM Symposium on Virtual Reality Software and Technology, VRST : 101-102. ScholarBank@NUS Repository.
Abstract: We present a new screen-space ambient occlusion algorithm (SSAO), which we call Multi-Resolution Screen-Space Ambient Occlusion (MSSAO). The method computes ambient occlusion by combining occlusion values using multiple mipmap levels of a g-buffer. Our method is based on the observation that occlusion due to further-away occluders are lower frequency and thus can be computed in coarser resolutions. On the other hand, nearby occluders cause higher-frequency occlusion that must be computed in finer resolutions. Our method samples occluders in screen space (similar to [Shanmugam and Arikan 2007]) and combines occlusion values across multiple image resolutions. Compared with two state-of the-art SSAO methods [Filion and McNaughton 2008; Bavoil et al. 2008], results from our algorithm are closer to ray-traced results, even when our algorithm is running at comparable or higher frame rates. Because no random sampling is used, and occlusion values in all levels are combined using edge-preserving blending, our results are free of noise or excessive blurring which are common in other SSAO methods. Copyright © 2010 by the Association for Computing Machinery, Inc.
Source Title: Proceedings of the ACM Symposium on Virtual Reality Software and Technology, VRST
ISBN: 9781450304412
DOI: 10.1145/1889863.1889885
Appears in Collections:Staff Publications

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