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- Title
A Significance Cache for Accelerating Global Illumination.
- Authors
Bashford-Rogers, Thomas; Debattista, Kurt; Chalmers, Alan
- 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.
- Subjects
RENDERING (Computer graphics); LIGHT; TRANSPORTATION; VARIANCES; MONTE Carlo method; COSINE function; LIGHTING; CAUSTICS (Optics)
- Publication
Computer Graphics Forum, 2012, Vol 31, Issue 6, p1837
- ISSN
0167-7055
- Publication type
Article
- DOI
10.1111/j.1467-8659.2012.02099.x