[Radiance-general] daylight coefficients representation.

[Greg Ward]

Hello Aditya,

How do you wish to visualize this information?  Since I presume you  
don't have a 3-D display in mind, this leaves you with the problem of  
projecting a hemisphere onto a flat image, which is bound to  
introduce distortions.  I am attaching two Radiance .cal files, one  
that goes from a vector direction to a Tregenza sky patch number as  
used by Daysim, and the other which performs the reverse  
translation.  It shouldn't be too difficult to convert these files  
into something Matlab understands.

Best,
-Greg

(Beware line-wrapping -- you may need to paste these links manually.)

http://www.radiance-online.org/cgi-bin/viewcvs.cgi/*checkout*/ray/src/ 
cal/cal/tregenza.cal?rev=HEAD&content-type=text/plain

http://www.radiance-online.org/cgi-bin/viewcvs.cgi/*checkout*/ray/src/ 
cal/cal/tregsrc.cal?rev=HEAD&content-type=text/plain

> From: "aditya potipireddi" <aditect at gmail.com>
> Date: February 6, 2008 4:33:04 PM PST
>
> Hi All,
>
> I am student at Arizona State University , currently i am doing my  
> thesis, and i am using daysim to generate daylight coefficients. i  
> want to represent the 145 diffuse daylight coefficients and the 65  
> direct daylight coefficients visually on to a hemisphere and  
> represent then with color index. could any one suggest any method  
> or program that gives such out put. or is there any Matlab script  
> that i can find which dose this.
>
> also if i have to do the above  using Matlab. my question is what  
> is the radius or the sky dome and what is the criteria for diving  
> the dome in to 145 segments.
>
> thank you,
>
> -- 
> Aditya Potipireddi
> MS Building Design ( Energy & Climate)
> Arizona State University
> tel. 480.544.4936