[Radiance-general] Three phase method

Thu Aug 21 06:00:32 PDT 2014

Thanks Greg! I will have a look and check it out when I have time.

Will the presentations be recorded and published this year? I will not go,
but I would like to keep myself up to date.

THANKS

Germán

2014-08-21 8:49 GMT-04:00 Greg Ward <gregoryjward at gmail.com>:

> Hi Germán,
>
> There is a man page for rfluxmtx, but that's about all we have at this
> point.  I sent Vayia some slides I plan to present at the workshop in
> London, and I can send this to others who are interested.  (I'm following
> my own recommendation not to include attachments in radiance-general posts,
> and my website is inaccessible at the moment for unknown reasons.)
>
> Rfluxmtx was created to simplify common sampling operations used with
> rcontrib, and will ultimately be used to simplify the internals of the
> genBSDF script, which is a less general tool.  The only program rfluxmtx
> completely replaces is genklemsamp.
>
> Cheers,
> -Greg
>
> *From: *CHI-German Molina <gmolina at hdlao.com>
>
> *Subject: *Re: [Radiance-general] Three phase method
>
> *Date: *August 21, 2014 2:23:31 PM GMT+02:00
>
>
>  This program seems pretty useful. Is there any manpage or something?
>
> Also, is it possible to do something like this by modifying/re-writing
> genBSDF script? I am not quite sure what was the motivation of writing a
> whole new program. Could you elaborate a little bit, Andy?
>
> THANKS A LOT
>
> Germán
>
>
> 2014-08-21 6:34 GMT-04:00 Vayia V <vaia13 at msn.com>:
>
>> Hello,
>>
>> Thank you for the reply and the help,
>>
>> About the two BSDF, I have for example a BSDF for the pipe and then I
>> have one more BSDF for the top (or bottom) part of the pipe. Can I somehow
>> merge them and use them both?
>>
>> As for the rfluxmtx, is there any tutorial available?
>>
>> Kind regards
>>
>> Vayia
>>
>> ------------------------------
>> From: amcneil at lbl.gov
>> Date: Wed, 20 Aug 2014 18:14:43 -0700
>> To: radiance-general at radiance-online.org
>>
>>
>> Hi Vayia,
>>
>> You should consider using the new rfluxmtx to generate a transmission
>> matrix for your lightpipe the resulting matrix won't be in a BSDF XML file
>> format, but I don't think you need that format anyway. One benefit is you
>> can specify any geometry for the entrance and exit (genBSDF requires
>> parallel, rectangular ports).
>>
>> A general (untested) approach is below.
>>
>> Finally, I'm not sure what you mean by two different parallel BSDFs. Can
>> you elaborate?
>>
>> Best,
>> Andy
>>
>>
>> insideport.rad:
>> #@rfluxmtx h=fk u=Y
>> materials & geometry
>>
>> outsideport.rad:
>> #@rfluxmtx h=fk u=Y
>> materials & geometry
>>
>> sky.rad:
>> #@rfluxmtx h=u u=Y
>> ground hemisphere
>> #@rfluxmtx h=r1 uY
>> sky hemisphere
>>
>>
>> cat sensorpoints.txt | \
>> rfluxmtx -faa -ab 12 -ad 50000 -lw 2e-5  -I \
>>  -y `wc -l < numeric/Space_1.map` \
>>  -  insideport.rad \
>>  materials.rad model.rad > view.mtx
>>
>> rfluxmtx -ab 12 -ad 5000 -lw 2e-5 insideport.rad outsideport.rad \
>>  materials.rad model.rad > lightpipe.mtx
>>
>> rfulxmtx -ab 2 -ad 1000 -lw 1e-3 outsideport.rad sky.rad \
>>  materials.rad model.rad > daylight.mtx
>>
>> rmtxop view.mtx lightpipe.mtx daylight.mtx > dcoef.mtx
>> dctimestep dcoef.mtx sky.mtx > illuminance.txt
>>
>>
>>
>>
>>
>>
>> On Wed, Aug 20, 2014 at 4:46 AM, Vayia V <vaia13 at msn.com> wrote:
>>
>>  Hello all,
>>
>> I have some more questions regarding the three phase method,
>>
>> I understand that I cannot simulate bending pipes with the genbsdf.
>> However I also need to simulate straight pipes that I think is able to be
>> done.
>>
>> My question is if I need to specify the depth of the pipe somehow in any
>> of the steps at the three phase method and how to do that.
>>
>> The way I create the geometry used at the daylight matrix and view matrix
>> (meaning the two ends of the pipe) are in the "proper distance". But is
>> this the correct way to do it (?) or the "entrance" of the pipe at the view
>> matrix should be at the same position as the "exit" of the pipe at the
>> daylight matrix (?) and then I specify the length of the pipe (that the
>> "light" will travel through the pipe) between the "entrance" and "exit"? I
>> suppose that maybe this way I could generate one bsdf of a long pipe and
>> then use it for different length of pipes?
>>
>> Another question that I have is if I can use two different parallel BSDFs
>> on one simulation.
>>
>> Thank you in advance,
>>
>> Vayia
>>
>>
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-- 
*Germán Molina L.*
Ingeniero Trainee
Hunter Douglas Chile S.A.
Celular +569 89224445

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