SIGGRAPH 2012 presentation slides

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inputs once per scene The Preetham Model θ 3 S 0.00166 -0.00375 0.00209 0 2 2 θS x z = T T 1 -0.02903 0.06377 -0.03202 0.00394 θ S 0.11693 -0.21196 0.06052 0.25886 1 F (θ,γ) A,B,C,D,E x = x z· F A,B,C,D,E (0,γ s) output zenith angles A 0.1787 -1.4630 B -0.3554 0.4275 T C = -0.0227 5.3251 1 D 0.1206 -2.5771 E -0.0670 0.3703 zenith luminance luma distribution parameters for each sample turbidity solar-zenith angle
Issues With the Preetham Model • Simple functions for calculating zenith luminance and luma distribution parameters • Only a small subset of possible atmospheric conditions can be captured • Lack of localised aureole at higher turbidities • Spectral data are obtained by conversion from trisitmulus data
Page 1 and 2: An Analytic Model for Full Spectral
Page 3: The Preetham Model • De facto sta
Page 7 and 8: • spectral (including UV) • lar
Page 9 and 10: Obtaining Reference Data
Page 11 and 12: Result: Comparison
Page 13 and 14: inputs Model flowchart once per sce
Page 15 and 16: Results
Page 17 and 18: UV & Fluorescence
Page 19: Conclusion • Reference implementa

SIGGRAPH 2012 presentation slides

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