[Radiance-general] Radiance-general Digest, Vol 108, Issue 29
Sim Swee Ling Annie
anniesim at surbana.com
Wed Feb 27 22:32:42 PST 2013
Thanks all for the advise & help!
Understand now that pcond -h is mainly for visual purpose. Hence, does
that also meant the exposure settings should not be adjusted (for
comparison of clear and darker glass)?
I am currently using the Desktop Radiance via Ecotect plug-in. Is there a
recommendation to which free tool available I can use that still allow me
to do glare analysis for an Ecotect model with better accuracy?
Have downloaded "radiance-4.2.a-win32.exe" but not too sure where to
start... What is the application difference with the Ecotect desktop
radiance plug-in I am using now. Am I supposed to generate an image via
Ecotect and use command prompt to run the analysis or there is another
tool I would need to download?
Cheers,
Ann
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Today's Topics:
1. Re: Desktop radiance Glare Analysis: Pcond (Lars O. Grobe)
2. Re: Desktop radiance Glare Analysis: Pcond (Christopher Rush)
3. Re: Desktop radiance Glare Analysis: Pcond (Rob Guglielmetti)
4. Re: Desktop radiance Glare Analysis: Pcond (Greg Ward)
5. Fwd: Problem with rtrace in Windows/Dos (leceta)
6. Re: Problem with rtrace in Windows/Dos (leceta)
----------------------------------------------------------------------
Message: 1
Date: Wed, 27 Feb 2013 11:11:57 +0100
From: "Lars O. Grobe" <grobe at gmx.net>
To: Radiance general discussion <radiance-general at radiance-online.org>
Subject: Re: [Radiance-general] Desktop radiance Glare Analysis: Pcond
Message-ID: <512DDBED.2030208 at gmx.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Ann,
first, Desktop Radiance is unsupported and has not been updated for
ages. Avoid using it, there are better, supported software around based
on current versions of Radiance.
Second, glare analysis is based on the pixel values. Thus I would not
adjust anything in images that are supposed to be used for analysis. To
make sure that you are working with original pixel values, use pcomb -o
: pcomb -o filtered.hdr > raw.hdr and use raw.hdr as input for all your
analysis.
But: Images generated by pcond -h can NOT be used for such analysis, and
as far as I know, there is no way to revert the changes made to the
pixel values. The idea behind pcond -h is to give a visual impression
what an scene would be perceived like by a human observer, which
requires changes to the pixel values beyond exposure settings.
Cheers, Lars.
------------------------------
Message: 2
Date: Wed, 27 Feb 2013 09:31:58 -0500
From: Christopher Rush <Christopher.Rush at arup.com>
To: Radiance general discussion <radiance-general at radiance-online.org>
Subject: Re: [Radiance-general] Desktop radiance Glare Analysis: Pcond
Message-ID:
<28285BAEA8C0814DBF1B199C876EC5B052BD821F34 at AMXEXC01.global.arup.com>
Content-Type: text/plain; charset="us-ascii"
I would suggest it is good practice when using pcond -h to save the image
as a low dynamic range file rather than .pic or .hdr, since pcond is meant
to create nice looking pictures, not useful data.
e.g.
pcond -h image.hdr | ra_ppm | convert ppm:- image.jpg
That way you never mix up .pic or .hdr files that contain adjusted and
incorrect data values.
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Message: 3
Date: Wed, 27 Feb 2013 08:20:28 -0700
From: Rob Guglielmetti <rob.guglielmetti at gmail.com>
To: Radiance general discussion <radiance-general at radiance-online.org>
Subject: Re: [Radiance-general] Desktop radiance Glare Analysis: Pcond
Message-ID: <195BD997-411F-43E6-A8F8-2D0902C30408 at gmail.com>
Content-Type: text/plain; charset=us-ascii
THat's a good idea, Chris. I usually make it a habit to name my tone
mapped .hdr files with a suffix that indicates to me that it's been run
through the pixel wringer, and of course the header will also indicate
that the image is the product of pond, but your method eliminates the
middle man. =)
- Rob
On Feb 27, 2013, at 7:31 AM, Christopher Rush <Christopher.Rush at arup.com>
wrote:
> I would suggest it is good practice when using pcond -h to save the
image as a low dynamic range file rather than .pic or .hdr, since pcond is
meant to create nice looking pictures, not useful data.
> e.g.
> pcond -h image.hdr | ra_ppm | convert ppm:- image.jpg
>
> That way you never mix up .pic or .hdr files that contain adjusted and
incorrect data values.
>
> ____________________________________________________________
> Electronic mail messages entering and leaving Arup business
> systems are scanned for acceptability of content and viruses
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>
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------------------------------
Message: 4
Date: Wed, 27 Feb 2013 08:54:31 -0800
From: Greg Ward <gregoryjward at gmail.com>
To: Radiance general discussion <radiance-general at radiance-online.org>
Subject: Re: [Radiance-general] Desktop radiance Glare Analysis: Pcond
Message-ID: <0B7E4D77-C725-42D3-87A8-4D043193DBF9 at lmi.net>
Content-Type: text/plain; charset=us-ascii
That's a good practice, and one I follow as well. Since pcond output is
meant to be sent to a printer or low dynamic-range display device,
converting it to a lower bit-depth at the same time makes perfect sense.
Some of the programs that convert to such formats have built-in
tone-mappers that are similar to pcond but less sophisticated and faster.
See the ra_bmp '-e' option and the normtiff command.
-Greg
> From: Christopher Rush <Christopher.Rush at arup.com>
> Date: February 27, 2013 6:31:58 AM PST
>
> I would suggest it is good practice when using pcond -h to save the
image as a low dynamic range file rather than .pic or .hdr, since pcond is
meant to create nice looking pictures, not useful data.
> e.g.
> pcond -h image.hdr | ra_ppm | convert ppm:- image.jpg
>
> That way you never mix up .pic or .hdr files that contain adjusted and
incorrect data values.
>
----------
> From: "Sim Swee Ling Annie" <anniesim at surbana.com>
> Date: February 27, 2013 1:25:43 AM PST
> Hi all,
>
> I was trying to run glare analysis via Desktop Radiance for glazing with
2 different VLT:
>
> a) VLT = 30
> b) VLT = 60
>
> The type used for these glazing are kept as default --> "glass".
>
> 1) For the first analysis, I have adjusted the exposure for both images
in order to reflect more accurate visual view showing the differences
between clear and darker glass.
>
> The glare index via UGR shows:
>
> a) VLT 30 = 36
> b) VLT 60 = 44
>
> 2) For the second analysis, on top adjusting the exposure, I have also
used "pcond -h" on the images.
>
> The glare index via UGR shows:
>
> a) VLT 30 = 0
> b) VLT 60 = 0
>
> Looking at the comparison of the results above, I am not sure whether
"pcond -h" should be used prior to glare analysis. Should the glare
analysis be done on raw images without "pcond -h"? ......although it was
stated that "pcond -h" will create a view that mimic human responses.
>
> Would really appreciate any sharing or help on this!
>
> Thanks in advance!
>
> Cheers,
>
> Ann
------------------------------
Message: 5
Date: Wed, 27 Feb 2013 18:54:24 +0100
From: leceta <aitorleceta at gmail.com>
To: radiance-general at radiance-online.org
Subject: [Radiance-general] Fwd: Problem with rtrace in Windows/Dos
Message-ID:
<CAOhSWL4YQxFnjhY5P=weZGcYVNAabAxi25_X_kcrQsPiY006Mw at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
solved,
was my bad, pts file was incorrect (comma separated values) : S
it takes me 4 days to catch this silly problem!
cheers
aitor leceta
---------- Forwarded message ----------
From: leceta <aitorleceta at gmail.com>
Date: 2013/2/27
Subject: Problem with rtrace in Windows/Dos
To: radiance-general at radiance-online.org
Hi all,
i?am using radiance package installed via Diva for rhino 1.9 (i guess) in
windows7 64 professional
I want to make some simple calculations like those i?ll describe via Dos
command line
1- set the working directory where all my files are (obj, rad, oct, ies,
dat, pts)
2- obj2rad works fine
3- ies2rad also fine
4- oconv also
but a simplified rtrace calculation like this
5- rtrace filename.oct<filename.pts>filename.dat
gives me as result a file with just the header but no irradiance values
for
the points in filename.pts
anyone knows what i?m doing wrong.
It?s because i?m not using cygwin, i mean, is the problem with my radiance
for window distribution? it woldn?t be the case as long as Diva is using
rtrace for its calculations without problems. At least it use to...
any hint or advice would be much apreciated
thanks
aitor
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Message: 6
Date: Wed, 27 Feb 2013 18:56:35 +0100
From: leceta <aitorleceta at gmail.com>
To: radiance-general at radiance-online.org
Subject: Re: [Radiance-general] Problem with rtrace in Windows/Dos
Message-ID:
<CAOhSWL6zhhHEj0+vzoKSeeuUQQZWPB0wix2Ec7bBPcBHAuk9Ww at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
I wonder why rtrace?s stderr was not giving me any information.
is this normal?
2013/2/27 leceta <aitorleceta at gmail.com>
> solved,
>
> was my bad, pts file was incorrect (comma separated values) : S
>
> it takes me 4 days to catch this silly problem!
>
> cheers
> aitor leceta
>
>
> ---------- Forwarded message ----------
> From: leceta <aitorleceta at gmail.com>
> Date: 2013/2/27
> Subject: Problem with rtrace in Windows/Dos
> To: radiance-general at radiance-online.org
>
>
> Hi all,
>
> i?am using radiance package installed via Diva for rhino 1.9 (i guess)
in
> windows7 64 professional
>
> I want to make some simple calculations like those i?ll describe via Dos
> command line
>
> 1- set the working directory where all my files are (obj, rad, oct, ies,
> dat, pts)
> 2- obj2rad works fine
> 3- ies2rad also fine
> 4- oconv also
>
> but a simplified rtrace calculation like this
>
> 5- rtrace filename.oct<filename.pts>filename.dat
>
> gives me as result a file with just the header but no irradiance values
> for the points in filename.pts
>
> anyone knows what i?m doing wrong.
>
> It?s because i?m not using cygwin, i mean, is the problem with my
radiance
> for window distribution? it woldn?t be the case as long as Diva is using
> rtrace for its calculations without problems. At least it use to...
>
> any hint or advice would be much apreciated
>
> thanks
> aitor
>
>
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