NDLI: A radiance cache method for highly glossy surfaces

Content Provider	Springer Nature Link
Author	Omidvar, Mahmoud Ribardière, Mickaël Carré, Samuel Méneveaux, Daniel Bouatouch, Kadi
Copyright Year	2015
Abstract	Radiance caching methods have proven to be efficient for global illumination. Their goal is to compute precisely illumination values (incident radiance or irradiance) at a reasonable number of points lying on the scene surfaces. These points, called records, are stored in a cache used for estimating illumination at other points in the scene. Unfortunately, with records lying on glossy surfaces, the irradiance value alone is not sufficient to evaluate the reflected radiance; each record should also store the incident radiance for all incident directions. Memory storage can be reduced with projection techniques using spherical harmonics or other basis functions. These techniques provide good results for low shininess BRDFs. However, they get impractical for shininess of even moderate value, since the number of projection coefficients increases drastically. In this paper, we propose a new radiance caching method that handles highly glossy surfaces while requiring a low memory storage. Each cache record stores a coarse representation of the incident illumination thanks to a new data structure, called Equivalent Area light Sources, capable of handling fuzzy mirror surfaces. In addition, our method proposes a new simplification of the interpolation process, since it avoids the need for expressing and evaluating complex gradients.
Starting Page	1239
Ending Page	1250
Page Count	12
File Format	PDF
ISSN	01782789
Journal	The Visual Computer
Volume Number	32
Issue Number	10
e-ISSN	14322315
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-10-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rendering Global illumination Radiance caching Glossy surfaces Computer Graphics Computer Science Artificial Intelligence (incl. Robotics) Image Processing and Computer Vision
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Computer Vision and Pattern Recognition Software

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