NDLI: Improved Computation of Attenuated Light with Application in Scenes with Many Light Sources

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Improved Computation of Attenuated Light with Application in Scenes with Many Light Sources

Content Provider	ACM Digital Library
Author	Milet, Tomáš Navrátil, Jan Zemčík, Pavel Herout, Adam
Abstract	This paper presents and investigates methods for fast and accurate illumination of scenes containing many light sources that have limited spatial influence, e.g. point light sources. For speeding up the computation, current graphics applications use an assumption that the light sources range can be limited using bounding spheres due to their limited spatial influence and illumination is computed only if a surface lies within the sphere. Therefore, we explore the differences in illumination between scenes illuminated with spatially limited light sources and physically more correct computation where the light radius is infinite. We show that the difference can be small if we add appropriate ambient lighting. The contribution of the paper is the method for fast estimation of ambient lighting in scenes illuminated by numerous light sources. We also propose a method for elimination of color discontinuities at the edges of the bounding spheres. Our solution is tested on two different scenes: a procedurally generated city and the Sibenik cathedral. Our approach allows for correct lighting computation in scenes with numerous light sources without any modification of the scene graph or other data structures or rendering procedures. It thus can be applied in various systems without any structural modifications.
Starting Page	139
Ending Page	144
Page Count	6
File Format	PDF
ISBN	9781450324809
DOI	10.1145/2508244.2508262
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2013-05-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Real-time rendering Many light sources Phong lighting model Ambient term
Content Type	Text
Resource Type	Article

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