Spherical Harmonic Lighting of Wavelength-Dependent Phenomena
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Date
2005
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association
Abstract
Rendering of objects that exhibit iridescence has previously been limited to simple lighting conditions generated from a few point or directional lights. We extend this idea by modeling light interference as a Bidirectional Re- flectance Distribution Function (BRDF) and precomputing the physically based surface response to hemisphere lighting in terms of a low order spherical harmonic basis. Parameterizing by view direction, we can store the light interference effect in a 2D texture map, where each entry contains a vector of spherical harmonic basis function coefficients. Our technique achieves a full spectral representation of interference color by maintaining the spherical harmonic basis in terms of Spectral Power Distribution (SPD) instead of a color-based format such as RGB. In addition, we demonstrate that our approach is amenable to current graphics hardware and can render at real-time frame rates.
Description
@inproceedings{10.2312:egs.20051039,
booktitle = {EG Short Presentations},
editor = {John Dingliana and Fabio Ganovelli},
title = {{Spherical Harmonic Lighting of Wavelength-Dependent Phenomena}},
author = {Lindsay, Clifford and Agu, Emmanuel},
year = {2005},
publisher = {The Eurographics Association},
ISBN = {},
DOI = {10.2312/egs.20051039}
}