[Radiance-general] Radiance-general Digest, Vol 159, Issue 19

[Andrea Zani]

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 <radiance-general-request at radiance-online.org>:

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> Today's Topics:
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>    1. Re: Problem with Trans material (Greg Ward)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 18 May 2017 11:39:20 -0700
> From: Greg Ward <gregoryjward at gmail.com>
> To: Radiance general discussion <radiance-general at radiance-online.org>
> Subject: Re: [Radiance-general] Problem with Trans material
> Message-ID: <A86C65CE-E443-4B31-9262-A2D4995B9D1E at lmi.net>
> 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 <mcneil.andrew at gmail.com>
> > 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 <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?
> >
> >
> >
> > 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*

via Ponzio, 31 | 20133 Milano | Italia

*t* +39 02 2399 6015

*@: *andrea.zani at polimi.it

*@: *andrea89.zani at gmail.com

www.polimi. <http://www.polimi.it/>it
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