[Radiance-general] (no subject)

[Santiago Torres]

Hello Greg,

Thank you for your reply. Unfortunately I`m short of time, so if  
possible I would like to see your scripts, thank you.
I`ve also uploaded a couple of (very noisy) images that I`m getting.  
Probably this is because I`m not using the right scripts, but just as  
an illustration.
The images are in:
http://home.att.ne.jp/banana/tiago/radiance/c_79.jpg    (example of  
one patch)
http://home.att.ne.jp/banana/tiago/radiance/output.jpg    (result  
combining all patches)
Regards,

Santiago



-----Original Message-----
From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org]On Behalf Of  
Gregory J.
Ward
Sent: Monday, October 31, 2005 11:59 AM
To: Radiance general discussion
Subject: Re: [Radiance-general] rtcontrib


Hi Santiago,

I wish I could offer you some words of encouragement, because I
appreciate the difficulty you face applying rtcontrib to daylight
coefficients.  The truth is, you really need some scripts to help out
with the task, and I haven't yet had a chance to write a general set
of scripts or an executive program for DC analysis.  I am working on
this project currently, as a matter of fact.

All I have at this point is a few test scripts I assembled for a
daylight simulation study, and I can make these available for you if
you need an early start on this.  If you can wait a few weeks, I will
have something much better, I hope.

Just to answer your question, adding together the rtcontrib outputs
directly gives you the result for a uniform sky.  To get a particular
sky, you must multiply each image by the average radiance of the
corresponding sky patch.  To compute this, a simple rtrace
calculation using the desired sky model and a set of randomly
distributed rays over the hemisphere will do the trick.  Such a set
of rays is given in the file "ray/lib/tregsamp.dat", where there are
64 rays per sky patch.  The command to compute pcomb arguments from
this file is:

rtrace -h skymodel.oct < tregsamp.dat \
         | total -64 -m \
         | rcalc -o '-s ${$2} c_${recno-1}.pic'

I realize this is just a clue, but if you wait a few weeks, hopefully
I can provide a complete solution.

-Greg

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