[Radiance-general] glaze script limitation

[François Cantin]

Jack, Greg,

Many thanks for your help with the scripts.

Your countless hours of devotion to the Radiance community and your advices are more than appreciated...... !!!!!!!!!!!!!


François




-----Original Message-----
From: Greg Ward [mailto:gregoryjward at gmail.com] 
Sent: Tuesday, December 14, 2010 7:08 PM
To: Radiance general discussion
Subject: Re: [Radiance-general] glaze script limitation

Hi François,

Unfortunately, there is no easy way to change the way the glaze script works regarding its requirement that one surface be uncoated glass.

The trouble is one of combinatorics.  Unless we incorporate a database containing all the possible front and back coating combinations, or a model like Optics has for computing the combined effect, we can't produce the correct output.  What we really need is a more general glazing modeler that can account for every possible configuration and produces a reliable Radiance material.  Maybe Window6 will provide this at some point, but we aren't there, yet.

As you suggest, it would be nice to have at least the ability to give a single-pane glazing as part of a dual-paned system as something precomputed by Optics, but I don't think you can just substitute values in the database and get it to work.  You'd have to reprogram the script a bit, and that's not a very inviting prospect....

-Greg

> From: François Cantin <FCantin at hudonjulien.com>
> Date: December 14, 2010 2:47:18 PM PST
> 
> Hi everyone,
> 
>  
> 
> I would like to model a double glazing system like the following:
> 
>  
> 
> first pane
> 
> surface 1: Crystal gray (Optics database number:  3056)
> 
> surface 2: Crystal gray with a SunGuard Ag 43 coating (Optics: 3156)
> 
>  
> 
> second pane
> 
> surface 3: Clear glass with a SunGuard SuperNeutral (SN) 62 coating (Optics: 3116)
> 
> surface 4: Clear glass (Optics: 3016)
> 
>  
> 
>  
> 
> Using the Optics2glazedb script provided by Jack de Valpine, I'm able to create a custom database which contain all of the above surfaces/layers and can be read by the Glaze script.
> 
>  
> 
> However, the Glaze script, used to combine the surfaces and generate a usable material definition, force the user to select at least one clear glass to compose each pane (surface 1 or 2 must be clear AND surface 3 or 4 must be clear). Moreover, the clear glass must be the same for both panes and must be the first one on the list provided when running the Glaze script.
> 
>  
> 
> My question is:
> 
> If I bypass the ''if structures'' constraining the composition of the panes in order to allow the selection of two different uncoated glass, can I expect  the output to be still valid ?
> 
>  
> 
> ...
> 
> #if ($s1t != 1 && $s2t != 1) then
> 
>                 #echo "One surface of each pane must be $sn_arr[1]"
> 
>                 #exit 1
> 
> #endif
> 
> ...
> 
>  
> 
>  
> 
> ...
> 
> #if ($s3t != 1 && $s4t != 1) then
> 
>                 #echo "One surface of each pane must be $sn_arr[1]"
> 
>                 #exit 1
> 
> #endif
> 
> ...
> 
>  
> 
>  
> 
> Without such bypass, generating a glazing system like the one described above seems impossible.
> 
>  
> 
>  
> 
> Thanks in advance for your help,
> 
>  
> 
>  
> 
> _____________________________________________________________
> 
> François Cantin, M Arch, MSc Arch
>                                                   
> Hudon Julien associes, 
> 
> 1175 Lavigerie, suite 400, Ste-Foy(Québec) G1V 4P1
> Tél: (418) 653-8484 #224, Fax:(418) 653-6189
> E-mail: fcantin at hudonjulien.com
> Site web: www.hudonjulien.com
> 
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> 
>  
> 
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