[Radiance-general] modeling an insulating glass with an integrated capillary slab

[Andy McNeil]

Thanks Zack.  you're right.  I just switched the labels.
I should also mention that this widget only works on browsers that support web kit:  safari & chrome.  not firefox.  I don't know about IE.
If you're on a mac, you can get it as a dashboard widget here: http://software.mcneilorama.com/Gen_Trans_Widget.html


On Apr 27, 2012, at 3:17 PM, Zack Rogers wrote:

> Hi Andy,
> 
> I think your roughness and absorption input labels are switched in this widget.  This is a nice little tool - thanks!
> 
> Zack
> 
> On Fri, Apr 27, 2012 at 3:31 PM, Andy McNeil <amcneil at lbl.gov> wrote:
> Hi Valeria,
> Trans is a quick and easy way to model this type of glazing.
> You can use this widget to generate a trans material definition by entering your transmission and reflection parameters: http://gaia.lbl.gov/people/andy/public/transwidget/
> 
> However trans does not account for Fresnel effects that reduce transmission of glass at non-normal incidence angles (http://en.wikipedia.org/wiki/File:Amptitude_Ratios_air_to_glass.JPG).  So treat trans results with some degree of caution.
> 
> If you want to include fresnell effects and diffusion, you might consider use a glass surface and a trans surface one in front of the other.  Or you could generate a BSDF and use the new BSDF material.
> 
> Hope this helps,
> Andy
> 
> 
> 
> 
> 
> On Apr 27, 2012, at 1:34 PM, Valeria De Giuli wrote:
> 
> > Dear all,
> > I have to model a two-pane glass make up with a selective 6mm outer pane with an integrated capillary slab (it is called kapilux), white tinted. The obtained effect is a uniform and diffuse light transmittance. The only technical data that I have are: 30% of direct visible transmittance  and 15% of diffuse visible transmittance. I think I should model it with "trans" material, but I don't know which parameters I have to use. Does anybody has an idea?
> > Thanks in advance. Best regards,
> > Valeria
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> -- 
> Zack Rogers, P.E., LEED AP BD+C    
> Daylighting Innovations, LLC
> 211 North Public Road, Suite 220
> Lafayette, CO 80026
> (303)946-2310
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