[Radiance-general] calculating CRI and CCT

[Greg Ward]

Hi Chris,

I don't think there's an easy way to do this with Radiance.  If you have complete spectral information for the sky, you can perform a multi-pass spectral calculation by substituting the appropriate components and material reflectances/transmittances for your subdivided spectrum.  There are a few posts related to this in the list archives.  Try searching on "spectral".

Cheers,
-Greg

> From: Christian Humann <chris at christianhumann.com>
> Subject: Re: [Radiance-general] calculating CRI and CCT
> Date: February 23, 2015 10:52:34 AM PST
> 
> Dear all,
> 
> Has anyone had the need and therefore figured out how to calculate CRI at a specific point within a daylit scene using Radiance?  Specifically I'm thinking of John Mardaljevic's paper on electrochromic glass where he used a spectrometer to get CRI of different combinations of glass tint.
> 
> I was thinking of using different HDR sky capture photos within gendaylit to simulate different sky conditions, and therefore was wondering also if there is a way to calculate CCT and SPD of these sky images with and without sun.
> 
> I'm in the early stages of scratching my head around all this, and as such may be barking up the wrong tree.  
> 
> Thanks.
> 
> Chris