Cumincad : CUMINCAD Papers : Paper 74bb:A practical analytic model for daylight

authors	Preetham, Shirley
year	1999
title	A practical analytic model for daylight
source	Proceedings of the SIGGRAPH annual conference on Computer graphics, 91-100
summary	Sunlight and skylight are rarely rendered correctly in computer graphics. A major reason for this is high computational expense. Another is that precise atmospheric data is rarely available. We present an inexpensive analytic model that approximates full spectrum daylight for various atmospheric conditions. These conditions are parameterized using terms that users can either measure or estimate. We also present an inexpensive analytic model that approximates the effects of atmosphere (aerial perspective). These models are fielded in a number of conditions and intermediate results verified against standard literature from atmospheric science. Our goal is to achieve as much accuracy as possible without sacrificing usability.
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last changed	2003/04/23 15:50