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

[Andy McNeil]

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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