[Radiance-general] sky models and color gradients

[Ignacio Munarriz]

I converted that model to a radiance dome, i usually work with radiance 
with aesthetical purposes so i'm not sure it's phisically accurate, it 
misses the atmosferic effects because, as Lars said, i think it's 
necesary to modify radiance code. I did it as part of a 3dsmax exporter 
to rad i'm working with.
I got the main sources some time ago from a web page of the University 
of Girona in Spain (sir project), i think they created the sources based 
on some code related to the paper, i've returned to search for the 
project again but i haven't found it on the internet.

It's a windows .exe file, the program creates three data files with 
radiance colordata and outputs a radfile with the definitions of the sun 
and the sky and a white box to avoid radiance no objects error, it uses 
a calc file ssky.cal to map the data to the dome, the parameters are

                 lat Latitude (0-360)
                 long Longitude (-90,90) south to north
                 sm  Standard Meridian
                 jd  Julian Day (1-365)
                 tod Time Of Day (0.0,23.99) 14.25 = 2:15PM
                 turb  Turbidity (1.0,30+) 2-6 are most useful for clear 
days.

gesky3 lat long sm jd tod turb (gesky 43 3 3 180 10 6 >ssky.rad)

you can download: www.aisarquitectura.com/archivos/ssky.zip

When i got it there were some code missing and i could not compile it as 
it was so i modified it, but not to distribute because i don't know the 
protocols to add new code (comments, licenses ...), so i can send the 
source code to anyone who is interested in cleanning it or somebody 
could try to help me in make it better

Ignacio Munarriz



Reinhart, Christoph escribió:
> I am very interested in a colored sky model as well Mark. Thank-you for
> offering to share! This work would be a perfect topic to present at the
> Radiance workshop in November. FYI, 3ds Max Design already has the Utah
> sky model implemented. It generates really impressive sunsets.
>
> Christoph
>
> -----Original Message-----
> From: radiance-general-bounces at radiance-online.org
> [mailto:radiance-general-bounces at radiance-online.org] On Behalf Of Mark
> Stock
> Sent: Thursday, April 16, 2009 9:26 AM
> To: Radiance general discussion
> Subject: Re: [Radiance-general] sky models and color gradients
>
> I am interested in this, too. How best to make it work? Convert 
> the formulae in the paper to a .cal file (that modifies a mist 
> volume or a dome-like source?) Pre-render a sky dome? Modify the 
> Radiance source itself?
>
> Since it is unlikely that one of us has the extra classes to make 
> the authors' sample code work, I volunteer to share what I come 
> up with if I get done first.
>
> Mark
>
> On Thu, 16 Apr 2009, Lars O. Grobe wrote:
>
>   
>> Found it, it is linked here:
>>
>> http://www.cs.utah.edu/vissim/papers/sunsky/
>>
>>
>> "A Practical Analytic Model for Daylight" by A. J. Preetham, Peter
>>     
> Shirley, 
>   
>> Brian Smits
>>
>>     
>
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