Mixing Monte Carlo and progressive rendering for improved global illumination
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In this paper, we seek to eliminate the noise caused by caustic paths during progressive Monte Carlo path tracing. We employ a filtering strategy over path space, handling each subspace using specialized derivations of path tracing and progressive photon mapping. Evaluating diffuse paths with path tracing allows the use of sample stratification over both pixels and the image as a whole, whilst sharp detailed caustics are produced using progressive photon mapping. This is an efficient, low noise progressive algorithm with vanishing bias combining the advantages of both Monte Carlo methods, and particle tracing.
KeywordsGlobal illumination Monte Carlo integration Path tracing Photon mapping
The work presented in this paper was funded by an EPSRC doctoral training grant and also EPSRC grant number EP/I031243/1. We would like to be notified about any adoption of this method into ray-tracing software since our funding council seeks to record the impact of its funded research.
- 7.Dutré, P., Lafortune, E.P., Willems, Y.: Monte Carlo light tracing with direct computation of pixel intensities. In: 3rd International Conference on Computational Graphics and Visualisation Techniques, pp. 128–137 (1993) Google Scholar
- 8.Fan, S., Chenney, S., Lai, Y.C.: Metropolis photon sampling with optional user guidance. In: Proceedings of the 16th Eurographics Symposium on Rendering, pp. 127–138. Eurographics Association, Aire-la-Ville (2005) Google Scholar
- 13.Jensen, H.W.: Global illumination using photon maps. In: Proceedings of the Eurographics Workshop on Rendering Techniques’96, pp. 21–30. Springer, London (1996) Google Scholar
- 15.Kollig, T., Keller, A.: Illumination in the presence of weak singularities. In: Monte Carlo and Quasi-Monte Carlo Methods (2004) Google Scholar
- 16.Lafortune, E.P., Willems, Y.D.: Bi-directional path tracing. In: Proceedings of the International Conference on Computational Graphics and Visualization Techniques (COMPUGRAPHICS’93), pp. 145–153 (1993) Google Scholar
- 19.Veach, E., Guibas, L.: Bidirectional estimators for light transport. In: Proceedings of the Eurographics Workshop on Rendering, pp. 147–162. Eurographics Association, Aire-la-Ville (1994) Google Scholar