[Radiance-general] Re: windows: illum useage?

[Mark de la Fuente]

I was curious about this too...
 
Is there any advantage to making an illum plane for each of the
windows?  Or will one large rectangle accomplish the same thing?  I was
under the impression there was enough averaging that you would not want
to go the large rectangle route.
 
Mark
 
 
Message: 2
Date: Thu, 1 Jul 2004 20:21:26 -0700
From: Greg Ward <gward at lmi.net>
Subject: Re: [Radiance-general] windows: illum useage?
To: Radiance general discussion <radiance-general at radiance-online.org>
Message-ID: <E6D37F2E-CBD6-11D8-BF6D-000A95BB392A at lmi.net>
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Hi Lars,
 
I recommend your "choice a)", and suggest you first try creating a 
rectangle that just covers the opening from the inside, then use 
mkillum to average it's output.  Keep your gensky command in the scene

(let "rad" automate things for you if you like), whether you want to 
look out the window or not.  The largest source of error from applying

skyfunc directly to fenestration is the lack of the building shadow on

the ground plane, leading to overestimation of the upward component 
from the window in cases where the sun is on the other side of the 
building.  Applying mkillum avoids this error, besides accounting for 
the framing of the window panes and the circular shape of the opening.
 
-Greg
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