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Atmospheric scattering

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So, im implementing preetham sky model and things are going ok. I got the sky color part working with the sun, but now I want to implement aerial perspective. I really want to know the units i should be using for equations like "extinction factor" and "in scatter" (meters? kilometers?). Right now i am multiplying extinction factor by my xyY color system, and then converting it all to RGB (is this correct?). What could also really help me out, is what are some correct values I should be getting from Extinction factor?

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