[Radiance-general] Problem with Trans material

[Andy McNeil]

Hi Andrea,
I just ran your BSDF command and got a BSDF with 35.6% direct-hemispherical
transmission for all incident angles.
How are you calculating the transmission from the BSDF file? Can you send
me your BSDF file in a separate email?
Andy

On Thu, May 18, 2017 at 7:03 AM, Andrea Zani <andrea89.zani at gmail.com>
wrote:

> Hi everyone,
>
> I am trying to generate a BSDF of a complex translucent facade component.
> One of the materials in the model is a fabric and I'm trying to simulate
> its optical behavior using a Trans material, however I have some problems.
> Creating a BSDF of the trans material (you can see the material definition
> below), I have obtained a particular angular transmission behavior as
> showed in the pictures below. There is a particular increment between 0°
> and 30° of the incidence angle, instead i was expected something similar to
> the dashed lines in the graphs. Is it normal to have this angular
> transmission trend? If not, how can I fix this problem?
>
> [image: Immagine incorporata 1]
>
> Trans material
> void trans Fabric
> 0
> 0
> 7 0.8 0.8 0.8 0.01 0 0.45 0
>
> BSDF:
> genBSDF -n 4 -c 4000 -dim 0.299 0.338 0.373 0.429 -0.018 0 -r -ab 10
> trans_test_tr3.rad
> For the test the material geometry is a rectangle.
>
>
> Thanks in advance.
> Best
>
> --
>
> *Andrea Zani*
>
> Meng  |  Phd Student & Researcher
>
>
>
> *Politecnico di Milano*
>
> via Ponzio, 31 | 20133 Milano | Italia
>
> *t* +39 02 2399 6015 <+39%2002%202399%206015>
>
> *@: *andrea.zani at polimi.it
>
> *@: *andrea89.zani at gmail.com
>
> www.polimi. <http://www.polimi.it/>it
>
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