[Radiance-general] How to calculate the ( rtn gtn btn ) values of the material type glass ?

[Greg Ward]

Hi Marina,

The tn formula assumes your Tn values are between 0 and 1, not 0 and  
100% -- your results should be:

void glass smpl_01
0
0
3 0.4449 0.5248 0.4675

Good that you checked!
-Greg

> From: marina aviles olmos <marina.aviles at gmail.com>
> Date: March 17, 2009 9:02:44 AM PDT
>
> Hi Greg,
>
> I don't know how I didn't thought about this. It seems also like quite
> an intuituve description!
> The results also look like right.
>
> Nevertheless I define how I have proceeded, because there is a step  
> that
> could be wrong.
>
>> From the hole transmitance spectrum of each glass sample I have just
> taken the transmittance values at this wavelengths you said and then
> calculated its tn
>
> #glass sample 01
>
> Rot=700nm        Tn=40.8            rtn= 18.093
> Green=546         Tn=48.13          gtn= 18.813
> Blue=436            Tn=42.87          btn= 18.317
>
> void glass smpl_01
> 0
> 0
> 3    0.18093    0.18813        0.18317
>
> And this would be the hole material description of this transparent
> glass, als just one layer glass, 10mm thick
>
> Thanks again,
>
> Marina