Radiance-general Digest, Vol 159, Issue 19

Hi,

with the new version seems definitely better. https://github.com/
NREL/Radiance
Thanks to Jan, Greg and Andy

Best

Andrea

···

2017-05-18 21:00 GMT+02:00 <[email protected]>:

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Today's Topics:

   1. Re: Problem with Trans material (Greg Ward)

----------------------------------------------------------------------

Message: 1
Date: Thu, 18 May 2017 11:39:20 -0700
From: Greg Ward <[email protected]>
To: Radiance general discussion <[email protected]>
Subject: Re: [Radiance-general] Problem with Trans material
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"

Hi Andrea,

It is important to use the latest CVS head when generating Klems
distributions with genBSDF. David Geisler-Moroder and Christian Knoflach
discovered a bug in the corrections for Klems solid angles built into
wrapBSDF, which is called by genBSDF. These errors are on the order of
what you are seeing, so if you are using a distribution built before
November of 2016, this could well be your problem.

Best,
-Greg

> From: Andy McNeil <[email protected]>
> Date: May 18, 2017 7:52:15 AM PDT
>
> 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 <[email protected]> > 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?
>
>
>
> 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
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*Andrea Zani*

Meng | Phd Student & Researcher

*Politecnico di Milano*

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