[Radiance-general] Clarification of Evalglare Output

Tue Jul 5 10:53:30 PDT 2016

Hi  Raghu,

the answers in detail below.
There will be released a new version soon (before the radiance workshop) 
with plenty new features (masking, zones, other indexes) and also a huge 
speed increase.
I have already tested the new version on more than 1000 different images 
and it is reproducing the data to 100% with an average speed improvement 
of factor 15 (for the images I have).
To extend the test I'm looking for approx. 5 volunteers doing some 
beta-testing with the new version in the next weeks. Operating systems 
for the test are Mac or Linux preferably.
If someone is interested in this new version, please send me a message.

Jan

> 1. difference between *E_vert*, *Edir* and if indirect vertical 
> illuminance which is not shown here could be defined as (*E_vert- Edir*) ?
E_vert is the Illuminance calculated from the image (usually vertical 
illuminance)
E_dir is the illuminance just by the detected glare sources (needed for 
the CIE glare index)
> 2. What are *Eglare_cie* and *Lveil_cie*? if you could explain in 
> simple terms it would be good.
these are disability glare values, for details read the documents on 
disability glare from the CIE
> 3. How is the *lum_sources* calculated? is it area weighted or just 
> the average of luminance sources?
It is the average luminance of all glare sources, weighted by the solid 
angle   equation: 
Lum_sources=(L1*omega_1+L2*omega_2+...Ln*omega_n)/(omega_1+omega_2+...omega_n) 

> 4.difference between *Lveil* and *Lveil_cie*?
Lveil is the disability glare according to Pointer. Lveil_cie according 
to CIE.
> 5. what is *band_avlum*? every time i get -99 as its value.
you should read the manual page;-) , it is explained there as well. If 
you define a horizontal band, then you get the average luminance in that 
horizontal band calculated. If you dont activate the option, you get 
-99. The new upcoming version will have a separate output section for 
the band evaluation, showing more data within the band. So the last-line 
output for the band (and the -99 for non-activation) will disappear.
> 6. Why is the last column for each glare source repeated i.e i think 
> its *sigma *which is repeated? is it on purpose or its a bug?
>
some values are the same for each glare source, some of them differ. 
That's why. Sigma is an angle needed to calculate the position index.
The actual official version, distributed from the Radiance-web-site, is 
bug-free as far as I know. A nasty output will be created, when no glare 
source is found (some results are nan or -inf). this is fixed for the 
upcoming version.

On 05/07/16 17:04, Raghuram Kalyanam wrote:
> Hi,
>
> I am working with Evalglare for my project. Some of the contents of 
> the outputs are not clear, exactly how they meant. I got the following 
> output
>
>
> No 	pixels 	x-pos 	y-pos 	L_s 	Omega_s 	Posindx 	L_b 	L_t 	E_vert 
> Edir 	Max_Lum 	Sigma 	xdir 	ydir 	zdir 	Eglare_cie 	Lveil_cie 	
> 1 	42753 	154.168663 	259.975238 	1484.9357 	0.514510267 	8.036393 
> 290.135466 	376.903168 	1193.615506 	330.128458 	2110.121582 
> 63.643786 	0.659243 	-0.651444 	0.375525 	295.006872 	0.728316 	63.643786
> 2 	952 	342.410504 	309.523074 	1243.639248 	0.014228416 	2.1257 
> 290.135466 	376.903168 	1193.615506 	330.128458 	2110.121582 
> 24.12489 	0.02124 	-0.977876 	0.208102 	16.006014 	0.275013 	24.12489
> 3 	458 	542.090308 	329.040637 	1088.438535 	0.006608648 	2.375158 
> 290.135466 	376.903168 	1193.615506 	330.128458 	2110.121582 
> 35.771815 	-0.683566 	-0.716718 	0.138035 	5.821968 	0.045498 	35.771815
> 4 	1381 	612.605097 	320.46217 	1147.674231 	0.018557649 	3.75482 
> 290.135466 	376.903168 	1193.615506 	330.128458 	2110.121582 
> 51.048974 	-0.847475 	-0.500159 	0.177839 	13.293604 	0.051012 	51.048974
>
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> dgp 	av_lum 	E_v 	lum_backg 	E_v_dir 	dgi 	ugr 	vcp 	cgi 
> lum_sources 	omega_sources 	Lveil 	Lveil_cie 	band_avlum 	
> 	
> 	
> 	
> 0.230826 	393.505949 	1193.615506 	290.135466 	330.128458 	7.652164 
> 10.742965 	78.552719 	14.814979 	1462.707418 	0.553905 	32.12133 
> 1.099838 	-99 	
> 	
> 	
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>
>
>
>
> Could some one explain
>
> 1. difference between *E_vert*, *Edir* and if indirect vertical 
> illuminance which is not shown here could be defined as (*E_vert- Edir*) ?
> 2. What are *Eglare_cie* and *Lveil_cie*? if you could explain in 
> simple terms it would be good.
> 3. How is the *lum_sources* calculated? is it area weighted or just 
> the average of luminance sources?
> 4.difference between *Lveil* and *Lveil_cie*?
> 5. what is *band_avlum*? every time i get -99 as its value.
> 6. Why is the last column for each glare source repeated i.e i think 
> its *sigma *which is repeated? is it on purpose or its a bug?
>
> If you have some documentation which can explain this, that would be 
> very useful.
>
>
>
> Thanks & Regards,
> Raghu
>
>
>
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> Radiance-general at radiance-online.org
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-- 
Dr.-Ing.  Jan Wienold
Ecole Polytechnique Fédérale 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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