Radiance-general Digest, Vol 108, Issue 29

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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Radiance-general Digest, Vol 108, Issue 29

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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" <[email protected]>
To: Radiance general discussion <[email protected]>
Subject: Re: [Radiance-general] Desktop radiance Glare Analysis: Pcond
Message-ID: <[email protected]>
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 <[email protected]>
To: Radiance general discussion <[email protected]>
Subject: Re: [Radiance-general] Desktop radiance Glare Analysis: Pcond
Message-ID:
<28285BAEA8C0814DBF1B199C876EC5B052BD821F34@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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systems are scanned for acceptability of content and viruses

------------------------------

Message: 3
Date: Wed, 27 Feb 2013 08:20:28 -0700
From: Rob Guglielmetti <[email protected]>
To: Radiance general discussion <[email protected]>
Subject: Re: [Radiance-general] Desktop radiance Glare Analysis: Pcond
Message-ID: <[email protected]>
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 <[email protected]> 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.

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Electronic mail messages entering and leaving Arup business
systems are scanned for acceptability of content and viruses

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------------------------------

Message: 4
Date: Wed, 27 Feb 2013 08:54:31 -0800
From: Greg Ward <[email protected]>
To: Radiance general discussion <[email protected]>
Subject: Re: [Radiance-general] Desktop radiance Glare Analysis: Pcond
Message-ID: <[email protected]>
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 <[email protected]>
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" <[email protected]>
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 <[email protected]>
To: [email protected]
Subject: [Radiance-general] Fwd: Problem with rtrace in Windows/Dos
Message-ID:
<CAOhSWL4YQxFnjhY5P=weZGcYVNAabAxi25_X_kcrQsPiY006Mw@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 <[email protected]>
Date: 2013/2/27
Subject: Problem with rtrace in Windows/Dos
To: [email protected]

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 <[email protected]>
To: [email protected]
Subject: Re: [Radiance-general] Problem with rtrace in Windows/Dos
Message-ID:
<CAOhSWL6zhhHEj0+vzoKSeeuUQQZWPB0wix2Ec7bBPcBHAuk9Ww@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 <[email protected]>

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 <[email protected]>
Date: 2013/2/27
Subject: Problem with rtrace in Windows/Dos
To: [email protected]

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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