[Radiance-general] BRTDfunc (Lars O. Grobe)

[Lars O. Grobe]

Hi Sierd,

as Christopher wrote in his mail, you should consider Optics as a 
starting point if you have a e.g. coated glazing. Whatever you do, 
reflection and transmission should be a function of the incident 
direction for clear glazings. One other approach may be the trans 
material, which allows to define reflection and transmission at normal 
incidence. The angular dependance will follow a Fresnel-term if you stay 
with only clear transmission and reflection, roughness=0. This may be 
what you want?

Peter did a very nice comparision on the various models available in 
Radiance:

http://arxiv.org/pdf/1307.4214.pdf

Cheers, Lars.
> Hi Lars,
>
> Thanks for your responding my question. I have used the glass function but I
> can only chance the transmission of this pane and not the reflection. In my
> project is the reflection of this pane very important and I was thinking the
> BRTDfunc will help me whit this. So for  that I have found the glazing.cal
> file in the library to calculate my glas but is ther also an explanation of
> these calculations
>
> cheers, Sierd.