[Radiance-general] BSDF with rtcontrib

Thu Jul 12 12:25:15 PDT 2012

Hi Nassif,
Data in the BSDF isn't specific to a date or time, so yes it is possible to
do an annual simulation with the xml file from window.

There are two official options and one un-official option:

1 - As Rob mentioned, you can use OpenStudio which does a lot of this for
you.

2 - you can loop through hours of the weather data file. Following is a
bash/awk example (add your weather data file at the end and include -a -o
and -m in the gensky and gendaylit command):
count=-8
while read line ; do
count=$((count+1))
if [ count -gt 0 ] ; then
daytime=`echo $line | awk -F, '{print $2,$3,$4-0.5}'`
alt=`gensky $daytime  | awk '{if(NR==3) print $6}'
if [ alt -gt 2 ]; then
dir=`echo $line | awk -F, '{print $14}'`
dif=`echo $line | awk -F, '{print $15}'`
gendaylit $daytime -W $dir $dif | genskyvec | dctimestep V.vmx T.xml D.dmx
>> output_$count.txt
fi
fi
done < myweather.epw

3 - Unofficial - you can use our annual utility (dctimestepcpu) that takes
a sky matrix file (list of annual sky vectors) and multiplies a whole year
in one go.  Let me know if you want to go this route, I can send you the
code for you to compile on your system.  This isn't a straight forward
compile process though, it may require some tweaking on your end.
http://simulationresearch.lbl.gov/sites/simulationresearch.lbl.gov/files/2011-ibpsa-radiance.pdf

Andy

On Thu, Jul 12, 2012 at 12:46 AM, nassif nassif <nynassif at gmail.com> wrote:

> Hallo Andy,
>
> thank you for your reply.
>
> I looked through the Tutorial you advised about. I realised the generated
> results are for one day. In our office we are using the .EPW to generate
> the results for the whole year. (as used in the tutorial in rtcontrib). Is
> it possible with BSDF somehow? if yes, Is there any hints or tips to insert
> the .xml format generated by window7beta into the rtcontrib process?
>
> Thanks in advance!
>
> N.Nassif
>
> On Tue, Jun 12, 2012 at 6:21 PM, <
> radiance-general-request at radiance-online.org> wrote:
>
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>>    1. Re: BSDF xml into Radiance (Andrew McNeil)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Tue, 12 Jun 2012 08:43:53 -0700
>> From: Andrew McNeil <amcneil at lbl.gov>
>> To: Radiance general discussion <radiance-general at radiance-online.org>
>> Subject: Re: [Radiance-general] BSDF xml into Radiance
>> Message-ID:
>>         <CAOG+Nizc0-+xrNry_qVJh6-hoA0C-=
>> P5EVTYuc7AiZuD9yqyVQ at mail.gmail.com>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Hi Nasif,
>>
>> Information for the BSDF material is at the bottom of page 12:
>> http://radsite.lbl.gov/radiance/refer/refman.pdf
>>
>> Though I've found that the BSDF material doesn't work well for
>> daylight coefficient based annual simulations (I'm assuming dds.bash is a
>> dynamic daylight simulation script).  Putting the solar radiance into
>> skypatches relies on probabilistic sampling to find patches containing the
>> sun, and if you don't have much direct transmission from the direction of
>> the sun, you aren't likely to find the sun.  Not finding the sun causes
>> big
>> errors.  For now, the three-phase method is a better alternative for
>> annual
>> simulation of BSDF materials (you can find a tutorial at the bottom of
>> this
>> page: http://www.radiance-online.org:82/learning/tutorials - if you're at
>> work, your company's firewall might block access to port 82 - the
>> temporary
>> location of the new radiance online).
>>
>> Andy
>>
>>
>>
>>
>>
>> On Tue, Jun 12, 2012 at 8:18 AM, nassif nassif <nynassif at gmail.com>
>> wrote:
>>
>> > Hallo,
>> >
>> > I manage to obtain bsdf in xml Format using Window7beta, but i couldn't
>> > know how to insert it in radiance. Is there somewhere an example how to
>> > embed or convert it into radiance material? I need to use it in
>> dds.bash (
>> > or rtcontrib).
>> >
>> > Thanks in advance
>> >
>> > --
>> > *N.Nassif
>> >
>> > Lighting Designer***
>> > *PLDA Member
>> >
>> > Neue Str. 55
>> > 21073, Hamburg
>> > Deutschland
>> >
>> > +49 162 6050060
>> > nynassif at gmail.com*
>> >
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