SIGGRAPH 2012 presentation slides
SIGGRAPH 2012 presentation slides
SIGGRAPH 2012 presentation slides
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inputs<br />
once per scene<br />
The Preetham Model<br />
θ <br />
3<br />
S<br />
0.00166 -0.00375 0.00209 0<br />
2 <br />
2<br />
θS<br />
x z = T T 1<br />
<br />
-0.02903 0.06377 -0.03202 0.00394<br />
<br />
<br />
<br />
θ <br />
S<br />
0.11693 -0.21196 0.06052 0.25886<br />
<br />
<br />
1 <br />
F (θ,γ)<br />
A,B,C,D,E<br />
x = x z·<br />
F A,B,C,D,E (0,γ s)<br />
output zenith angles<br />
A 0.1787 -1.4630<br />
<br />
B<br />
<br />
-0.3554 0.4275<br />
<br />
T C = -0.0227 5.3251 <br />
1<br />
<br />
<br />
<br />
D<br />
<br />
0.1206 -2.5771<br />
<br />
<br />
E <br />
<br />
<br />
-0.0670 0.3703<br />
<br />
zenith luminance luma distribution parameters<br />
for each sample<br />
turbidity<br />
solar-zenith angle
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