Title

Improved Radiance Gradient Computation

Keywords

Global illumination; Irradiance gradients; Radiance caching; Radiance gradients; Ray tracing

Abstract

We describe a new and accurate algorithm for computing translational gradients of incoming radiance in the context of a ray tracing-based global illumination solution. The gradient characterizes how the incoming directional radiance function changes with displacement on a surface. We use the gradient for a smoother radiance interpolation over glossy surfaces in the framework of the radiance caching algorithm. The proposed algorithm generalizes the irradiance gradient computation by [Ward and Heckbert 1992] to allow its use for non-diffuse, glossy, surfaces. Compared to previous method for radiance gradient computation, the new algorithm yields better gradient estimates in the presence of significant occlusion changes in the sampled environment, allowing a smoother indirect illumination interpolation. Copyright © 2005 by the Association for Computing Machinery, Inc.

Publication Date

1-1-2005

Publication Title

Spring Conference on Computer Graphics, SCCG 2005 - Conference Proceedings

Number of Pages

155-159

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1145/1090122.1090148

Socpus ID

33749005412 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/33749005412

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