> I looked outside a little while ago, and observed that the sky was blue.
>
> But when I asked POV-Ray to do some radiosity with a blue sky, the
> entire scene came out blue. Which, logically speaking, isn't surprising.
> If the sky is blue, clearly it's emitting blue light, which would result
> in everything being illuminated blue.
>
> And yet, when I look outside, the world is /not/ tinged blue. So... WTH?

Because there's usually a light_source{ <0,0,0> color Yellow*6500 } in 
the scene.

Look at shadows on snow or on a beach, they'll be blue.

http://www.free-desktop-backgrounds.net/free-desktop-wallpapers-backgrounds/free-hd-desktop-wallpapers-backgrounds/122079702.jpg

http://www.amandapair.com/wp-content/uploads/2009/09/shadows-in-sand.jpg


-- 
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/*        @        */{P(0,a)P(a,b)P(b,c)P(2*a,2*b)P(2*b,b+c)P(b+c,<2,3>)
/*   gmail.com     */}camera{orthographic location<6,1.25,-6>look_at a }

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