Interactive Caustics Using Local Precomputed Irradiance

Authors:
Chris Wyman;Charles Hansen;Peter Shirley
Affiliations:
The University of Iowa;The University of Utah;The University of Utah
Venue:
PG '04 Proceedings of the Computer Graphics and Applications, 12th Pacific Conference
Year:
2004

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Abstract

Bright patterns of light focused via reflective or refractive objects onto matte surfaces are called "caustics". We present a method for rendering dynamic scenes with moving caustics at interactive rates. This technique requires some simplifying assumptions about caustic behavior allowing us to consider it a local spatial property which we sample in a pre-processing stage. Storing the caustic locally limits caustic rendering to a simple lookup. We examine a number of ways to represent this data, allowing us to trade between accuracy, storage, run time, and precomputation time.