[Radiance-general] Questions about uniform sky

[Ignacio Munárriz]

take a look at skybright.cal to know how radiance deals with sky, it's
explained too in rendering with radiance book


----- Original Message -----
From: "Christopher Kings-Lynne" <chriskl at familyhealth.com.au>
To: "Radiance general discussion" <radiance-general at radiance-online.org>
Sent: Friday, February 25, 2005 12:00 PM
Subject: Re: [Radiance-general] Questions about uniform sky


> > 1. Christopher, the theoretical factor between radiance and irradiance
at a
> > point in that case is pi, you only have to integrate a uniform radiance
over
> > a hemisphere to obtain it. Radiance can give some lite error due to the
> > randomless of indirect calculation.
>
> Ah, I think I've got it...
>
> Execute "gensky 3 21 14:00 -a 51.3 -o 0.1 -m 0.0 -u" to see:
>
> # Ground ambient level: 23.8
>
> Now, take the 23.8 and multiply by 179PI:
>
> horiz_illum = 23.8 * 179 * PI = 13383.813
>
> Which is very close to my empirical values, so must be correct, right? :D
>
> Thanks,
>
> Chris
>
>
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