[Radiance-general] 3. Re: GR Observer (Greg Ward) (Jan Wienold)
N. Nassif
nynassif at gmail.com
Fri May 18 04:50:27 PDT 2018
Hallo Jan,
Thank you for your explicit answer. I will check it out!
Mit freundlichen Grüssen,
Josef.Nassif
Dipl.-Ing. Elektrotechnik
MA(FH) Architectural Lighting Design
2018-05-18 11:34 GMT+02:00 <radiance-general-request at radiance-online.org>:
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> 1. Re: Daylight Award! (Jan Walter)
> 2. Re: 3. Re: GR Observer (Greg Ward) (Jan Wienold)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 18 May 2018 09:51:09 +0100
> From: Jan Walter <jdb.walter at gmail.com>
> To: Radiance general discussion <radiance-general at radiance-online.org>
> Subject: Re: [Radiance-general] Daylight Award!
> Message-ID:
> <CAKXUb-CZrosjcKeV76Hth8bizryf6-GzZFPJW9F7Xnd-j7UtaQ at mail.
> gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Congratulations, Greg!
>
> On Wed, May 16, 2018 at 10:03 PM, Galen Burrell <Galen.Burrell at arup.com>
> wrote:
> > Congratulations to Greg Ward for receiving the prestigious 2018 Velux
> > Daylight Award for Daylight Research!
>
>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 18 May 2018 11:33:57 +0200
> From: Jan Wienold <jan.wienold at epfl.ch>
> To: radiance-general at radiance-online.org
> Subject: Re: [Radiance-general] 3. Re: GR Observer (Greg Ward)
> Message-ID: <5591d918-b251-17ec-0741-ed27d8a65aba at epfl.ch>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> Hi Josef,
>
> Lvl of the equation is the veiling luminance according to
> Stiles-Holladay and used in the CIE publications for disability glare.
> You can calculate Lvl by evalglare, it is one of the outputs if you use
> the -d option. the evalglare output is called "Lveil_cie", dont mix it
> up with "Lveil", which is the disability equation according to Pointer
> and differs a lot to the CIE equation.
>
> For your configuration, I would de-activate the peak extraction (by
> using the -x option) and use a meaningful absolute threshold for glare
> source detection (e.g. 2000 cd/m2).
>
> The second part of the GR equation (Lve) cannot be solved by
> image-evaluation automatically, since it uses the average horizontal?
> illuminance (not vertical). So you have to measure it separately and
> calculate the GR manually.
>
> The bigger challenge is to measure accurately this situations with a HDR
> camera, since you will deal very probably with flicker (discharging
> lamps, led..). As a general rule you need to restrict the shortest
> exposure time to 10/f (f: frequency of the flicker). At the same time
> should be the maximum pixel value of the shortest exposure time not more
> than 200 (better lower) to avoid pixel overflow.
>
> For high luminance light sources it is hard to comply with both rules at
> the same time. So you have to check, if you need to use a filter and use
> longer exposure times.
>
> A second thing you have to consider is, that you need to have the right
> lens type description in the header of the hdr image ("VIEW=...") ,
> otherwise the angles (e.g. angle between line of sight=center of image
> and the glare source or all solid angles) are not correctly calculated
> by any software (findglare, evalglare). For perspective lenses you need
> to check the viewing angles. This should be done by measurements, since
> manufacturers information or not always correct and the angles might
> differ for the same lens for different cameras attached to it.
>
> Good luck!
>
> Jan
>
>
>
> On 18.05.18 10:22, N. Nassif wrote:
> > Hey,
> >
> > I found this online from AGI32:
> >
> > https://docs.agi32.com/AGi32/Content/adding_calculation_
> points/Calculations_Glare_Rating_Concepts.htm
> >
> > The Formula is GR = 27 + 24 lg (LVL/LVE?^0.9)
> >
> > I checked the ones you sent (findglare and glarendx?), but I did see
> > it, or am I mistaken?
> >
> > Thank you!
> >
> > Mit freundlichen Gr?ssen,
> >
> > Josef.Nassif
> >
> > Dipl.-Ing. Elektrotechnik
> >
> > MA(FH) Architectural Lighting Design
> >
> >
> > 2018-05-18 2:51 GMT+02:00
> > <radiance-general-request at radiance-online.org
> > <mailto:radiance-general-request at radiance-online.org>>:
> >
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> > Today's Topics:
> >
> > ? ?1. GR Observer (N. Nassif)
> > ? ?2. Re: Daylight Award! (Mudit Saxena)
> > ? ?3. Re: GR Observer (Greg Ward)
> > ? ?4. Re: Daylight Award! (Amarpreet Sethi)
> >
> >
> > ------------------------------------------------------------
> ----------
> >
> > Message: 1
> > Date: Thu, 17 May 2018 22:15:55 +0200
> > From: "N. Nassif" <nynassif at gmail.com <mailto:nynassif at gmail.com>>
> > To: radiance-general at radiance-online.org
> > <mailto:radiance-general at radiance-online.org>
> > Subject: [Radiance-general] GR Observer
> > Message-ID:
> > ? ? ? ?
> > <CAOQvQdnvZ9D1ynZNc-oo2TeXvu5Y3h_5iuK9DPVxN5dJ0rYCGA at mail.gmail.com
> > <mailto:CAOQvQdnvZ9D1ynZNc-oo2TeXvu5Y3h_5iuK9DPVxN5dJ0rYCGA at mail.
> gmail.com>>
> > Content-Type: text/plain; charset="utf-8"
> >
> > Hey Community,
> >
> > is there a way to calculate the *GR *Observer (Glare Rating) in
> > Radiance?
> > GR is the measure of glare in exterior spaces.
> >
> > My attempt is to use HDR photos and analyze a scene in exterior,
> > mainly at
> > an Airport field: Apron, Aircraft Stands.
> >
> > Thank you in advance,
> >
> > and Congrats GREG! :)
> >
> > Mit freundlichen Gr?ssen,
> >
> >
> >
> > Josef.Nassif
> >
> > Dipl.-Ing. Elektrotechnik
> >
> > MA(FH) Architectural Lighting Design
> > -------------- next part --------------
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> >
> > ------------------------------
> >
> > Message: 2
> > Date: Thu, 17 May 2018 13:24:02 -0700
> > From: Mudit Saxena <msaxena at vistar-energy.com
> > <mailto:msaxena at vistar-energy.com>>
> > To: Radiance general discussion
> > <radiance-general at radiance-online.org
> > <mailto:radiance-general at radiance-online.org>>
> > Subject: Re: [Radiance-general] Daylight Award!
> > Message-ID:
> > <395BEEEC-1877-4B61-8142-DFF71794A413 at vistar-energy.com
> > <mailto:395BEEEC-1877-4B61-8142-DFF71794A413 at vistar-energy.com>>
> > Content-Type: text/plain; charset="utf-8"
> >
> > This made my day!! So well deserved Greg!! Your humble response
> > reminds us just why you deserve this award. Your selfless and
> > devoted support of the Radiance community over the years has
> > helped countless people. I hope I can echo some of those people in
> > saying Thank You and Congratulations!
> >
> >
> > Mudit Saxena
> > Principal, Vistar Energy
> > www.vistar-energy.com <http://www.vistar-energy.com>
> > +1 (916) 543-7186? | MSaxena at vistar-energy.com
> > <mailto:MSaxena at vistar-energy.com>
> >
> >
> > > On May 17, 2018, at 8:34 AM, Randolph M. Fritz
> > <rmfritz3 at gmail.com <mailto:rmfritz3 at gmail.com>> wrote:
> > >
> > > Congratulations, Greg!
> > >
> > > --
> > > Randolph M. Fritz || +1 206 659-8617 || rmfritz3 at gmail.com
> > <mailto:rmfritz3 at gmail.com>
> > >
> > >> On Wed, May 16, 2018 at 2:03 PM, Galen Burrell
> > <Galen.Burrell at arup.com <mailto:Galen.Burrell at arup.com>> wrote:
> > >> Congratulations to Greg Ward for receiving the prestigious 2018
> > Velux Daylight Award for Daylight Research!
> > >>
> > >>
> > >>
> > >> http://www.thedaylightaward.com/laureates/
> > <http://www.thedaylightaward.com/laureates/>
> > >>
> > >>
> > >>
> > >> I?m sure all of us on this list could not imagine a more
> > deserving recipient for this award given his contributions to the
> > field, and the legacy he has created with Radiance.
> > >>
> > >>
> > >>
> > >> Congrats Greg!
> > >>
> > >>
> > >>
> > >> --
> > >>
> > >> Galen Burrell? LEED AP
> > >>
> > >> Senior Designer | Lighting
> > >>
> > >>
> > >>
> > >> Arup
> > >>
> > >> t: +1 415 957 9445? d: +1 415 946 2367
> > >>
> > >> m: +1 415 906 9191
> > >>
> > >> www.arup.com <http://www.arup.com>
> > >>
> > >>
> > >>
> > >> ____________________________________________________________
> > >> Electronic mail messages entering and leaving Arup business
> > >> systems are scanned for viruses and acceptability of content
> > >>
> > >>
> > >> _______________________________________________
> > >> Radiance-general mailing list
> > >> Radiance-general at radiance-online.org
> > <mailto:Radiance-general at radiance-online.org>
> > >>
> > https://www.radiance-online.org/mailman/listinfo/radiance-general
> > <https://www.radiance-online.org/mailman/listinfo/radiance-general>
> > >>
> > >
> > > _______________________________________________
> > > Radiance-general mailing list
> > > Radiance-general at radiance-online.org
> > <mailto:Radiance-general at radiance-online.org>
> > >
> > https://www.radiance-online.org/mailman/listinfo/radiance-general
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> >
> > ------------------------------
> >
> > Message: 3
> > Date: Thu, 17 May 2018 15:21:41 -0700
> > From: Greg Ward <gregoryjward at gmail.com
> > <mailto:gregoryjward at gmail.com>>
> > To: Radiance general discussion
> > <radiance-general at radiance-online.org
> > <mailto:radiance-general at radiance-online.org>>
> > Subject: Re: [Radiance-general] GR Observer
> > Message-ID: <E30D7279-28DB-4A50-9960-1B0E586BCBFB at lmi.net
> > <mailto:E30D7279-28DB-4A50-9960-1B0E586BCBFB at lmi.net>>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Thanks, Josef.
> >
> > Do you happen to have a reference or a formula for GR? It's not
> > the same as UGR, is it?? There are so many glare indices, and the
> > findglare and
> > ??
> > glarendx programs can be combined to compute several of them from
> > HDR images or renderings, but I don't know about this one.
> >
> > Cheers,
> > -Greg
> >
> > > From: "N. Nassif" <nynassif at gmail.com <mailto:nynassif at gmail.com>>
> > > Date: May 17, 2018 1:15:55 PM PDT
> > >
> > > Hey Community,
> > >
> > > is there a way to calculate the GR Observer (Glare Rating) in
> > Radiance? GR is the measure of glare in exterior spaces.
> > >
> > > My attempt is to use HDR photos and analyze a scene in exterior,
> > mainly at an Airport field: Apron, Aircraft Stands.
> > >
> > > Thank you in advance,
> > >
> > > and Congrats GREG! :)
> > >
> > > Mit freundlichen Gr?ssen,
> > >
> > > Josef.Nassif
> > > Dipl.-Ing. Elektrotechnik
> > > MA(FH) Architectural Lighting Design
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL:
> > <http://www.radiance-online.org/pipermail/radiance-
> general/attachments/20180517/7a95c876/attachment-0001.html
> > <http://www.radiance-online.org/pipermail/radiance-
> general/attachments/20180517/7a95c876/attachment-0001.html>>
> >
> > ------------------------------
> >
> > Message: 4
> > Date: Fri, 18 May 2018 00:51:25 +0000
> > From: Amarpreet Sethi <amarpreet_s at hotmail.com
> > <mailto:amarpreet_s at hotmail.com>>
> > To: Radiance general discussion
> > <radiance-general at radiance-online.org
> > <mailto:radiance-general at radiance-online.org>>
> > Subject: Re: [Radiance-general] Daylight Award!
> > Message-ID:
> > ? ? ? ?
> > <MWHPR14MB14212B9EB21F3137268D5C0D8A900 at MWHPR14MB1421.
> namprd14.prod.outlook.com
> > <mailto:MWHPR14MB14212B9EB21F3137268D5C0D8A900@
> MWHPR14MB1421.namprd14.prod.outlook.com>>
> >
> > Content-Type: text/plain; charset="utf-8"
> >
> > Congratulations Greg and THANKYOU!!!
> >
> > Amarpreet
> >
> > On May 17, 2018, at 3:12 PM, Mudit Saxena
> > <msaxena at vistar-energy.com
> > <mailto:msaxena at vistar-energy.com><mailto:msaxena at vistar-energy.com
> > <mailto:msaxena at vistar-energy.com>>> wrote:
> >
> > This made my day!! So well deserved Greg!! Your humble response
> > reminds us just why you deserve this award. Your selfless and
> > devoted support of the Radiance community over the years has
> > helped countless people. I hope I can echo some of those people in
> > saying Thank You and Congratulations!
> >
> >
> > Mudit Saxena
> > Principal, Vistar Energy
> > www.vistar-energy.com
> > <http://www.vistar-energy.com><http://www.vistar-energy.com
> > <http://www.vistar-energy.com>>
> > +1 (916) 543-7186? | MSaxena at vistar-energy.com
> > <mailto:MSaxena at vistar-energy.com><mailto:MSaxena at vistar-energy.com
> > <mailto:MSaxena at vistar-energy.com>>
> >
> >
> > On May 17, 2018, at 8:34 AM, Randolph M. Fritz <rmfritz3 at gmail.com
> > <mailto:rmfritz3 at gmail.com><mailto:rmfritz3 at gmail.com
> > <mailto:rmfritz3 at gmail.com>>> wrote:
> >
> > Congratulations, Greg!
> >
> > --
> > Randolph M. Fritz || +1 206 659-8617 || rmfritz3 at gmail.com
> > <mailto:rmfritz3 at gmail.com><mailto:rmfritz3 at gmail.com
> > <mailto:rmfritz3 at gmail.com>>
> >
> > On Wed, May 16, 2018 at 2:03 PM, Galen Burrell
> > <Galen.Burrell at arup.com
> > <mailto:Galen.Burrell at arup.com><mailto:Galen.Burrell at arup.com
> > <mailto:Galen.Burrell at arup.com>>> wrote:
> > Congratulations to Greg Ward for receiving the prestigious 2018
> > Velux Daylight Award for Daylight Research!
> >
> > http://www.thedaylightaward.com/laureates/
> > <http://www.thedaylightaward.com/laureates/>
> >
> > I?m sure all of us on this list could not imagine a more deserving
> > recipient for this award given his contributions to the field, and
> > the legacy he has created with Radiance.
> >
> > Congrats Greg!
> >
> > --
> > Galen Burrell? LEED AP
> > Senior Designer | Lighting
> >
> > Arup
> > t: +1 415 957 9445? d: +1 415 946 2367
> > m: +1 415 906 9191
> > www.arup.com <http://www.arup.com> <http://www.arup.com/>
> >
> >
> > ____________________________________________________________
> > Electronic mail messages entering and leaving Arup business
> > systems are scanned for viruses and acceptability of content
> >
> > _______________________________________________
> > Radiance-general mailing list
> > Radiance-general at radiance-online.org
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> --
> Dr.-Ing. Jan Wienold
> Ecole Polytechnique F?d?rale de Lausanne (EPFL)
> EPFL ENAC IA LIPID
>
> http://people.epfl.ch/jan.wienold
> LE 1 111 (Office)
> Phone +41 21 69 30849
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