Irradiance Gradients

Publication Type

Conference Paper

Date Published

05/1992

LBNL 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