Irradiance Gradients

Date Published
05/1992
Publication Type
Conference Paper
Authors
LBL Report Number
LBL-32205
Abstract

A new method for improving the accuracy of a diffuse interreflection calculation is introduced in a ray tracing context. The information from a hemispherical sampling of the luminous environment is interpreted in a new way to predict the change in irradiance as a function of position and surface orientation. The additional computation involved is modest and the benefit is substantial. An improved interpolation of irradiance resulting from the gradient calculation produces smoother, more accurate renderings. This result is achieved through better utilization of ray samples rather than additional samples or alternate sampling strategies. Thus, the technique is applicable to a variety of global illumination algorithms that use hemicubes or Monte Carlo sampling techniques.

Conference Name
Eurographics Rendering Workshop
Year of Publication
1992
Conference Location
Bristol, England
Call Number
LBL-32205
Custom 1
<p>Lighting Systems Group</p>
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