I'm not sure how physically correct it is, but SkyLight could be your
choice for POV-Ray. It has been included in LightSys, which offers
additional macros for lights and light calculations. You can find it at

	http://www.ignorancia.org/lightsys.php

HTH,
Florian
-- 
camera{look_at-y*10location<8,-3,-8>*10}#local a=0;#while(a<999)sphere{
#local _=.01*a-4.99;#local p=a*.01-5;#local c=.01*a-4.995;<sin(p*pi)*5p
*10pow(p,5)*.01>sin(c*c*c*.1)+1pigment{rgb 3}}#local a=a+1;#end
/******** http://www.torfbold.com ******** http://www.imp.org ********/

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