Bashford-Rogers, Thomas, Debattista, Kurt and Chalmers, Alan (2012) A significance cache for accelerating global illumination. Computer Graphics Forum, Vol.31 (No.6). pp. 1837-1851. doi:10.1111/j.1467-8659.2012.02099.x

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Abstract

Rendering using physically based methods requires substantial computational resources. Most methods that are physically based use straightforward techniques that may excessively compute certain types of light transport, while ignoring more important ones. Importance sampling is an effective and commonly used technique to reduce variance in such methods. Most current approaches for physically based rendering based on Monte Carlo methods sample the BRDF and cosine term, but are unable to sample the indirect illumination as this is the term that is being computed. Knowledge of the incoming illumination can be especially useful in the case of hard to find light paths, such as caustics or scenes which rely primarily on indirect illumination. To facilitate the determination of such paths, we propose a caching scheme which stores important directions, and is analytically sampled to calculate important paths. Results show an improvement over BRDF sampling and similar illumination importance sampling.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Journal or Publication Title:	Computer Graphics Forum
Publisher:	Wiley-Blackwell Publishing, Inc.
ISSN:	0167-7055
Official Date:	September 2012
Dates:	Date Event September 2012 Published
Volume:	Vol.31
Number:	No.6
Page Range:	pp. 1837-1851
DOI:	10.1111/j.1467-8659.2012.02099.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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