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 tracingbased 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.

Publication Date

12-1-2007

Publication Title

ACM SIGGRAPH 2007 Papers - International Conference on Computer Graphics and Interactive Techniques

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

79960166355 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/79960166355

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