NDLI: Global Importance Sampling of Glossy Surfaces Using the Photon Map

Content Provider	IEEE Xplore Digital Library
Author	Steinhurst, J. Lastra, A.
Copyright Year	2006
Description	Author affiliation: Dept. of Comput. Sci., North Carolina Univ., Chapel Hill, NC (Steinhurst, J.; Lastra, A.)
Abstract	Importance sampling reduces the variance of Monte Carlo integration by focusing effort on the directions that contribute the most energy to the result. In this paper we present a computationally efficient global importance-sampling strategy. Final gather rays are generated in proportion to the product of all three factors of the rendering equation integrand: surface reflectance, incident radiance, and the cosine term. By focusing effort on those directions that contribute the most energy to the result, the variance is greatly reduced. To be suitable for an interactive system, the computational cost of generating samples and their associated probabilities must be low. Our method requires neither that the surface reflectance function be invertible, nor that an expensive calculation be performed after ray selection to evaluate the p.d.f. Building on Henrik Jensen's work, we use a photon map to estimate incident radiance. In this paper, we also use the photon map to render the final image. We compare our method to previous methods and conclude that our technique exhibits competitive variance reduction while requiring one fiftieth of the computation
Starting Page	133
Ending Page	138
File Size	512915
Page Count	6
File Format	PDF
ISBN	1424406935
DOI	10.1109/RT.2006.280224
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-09-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ray Tracing Interactive Rendering Global illumination Photonics Reflectivity Computer science Photon Mapping Monte Carlo methods Interactive systems Layout Importance Sampling Lighting Image generation Bidirectional control Ray tracing
Content Type	Text
Resource Type	Article

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