[Radiance-general] Clarification of Evalglare Output

Tue Jul 5 11:40:24 PDT 2016

Hi Jan,

Thank you very much, that clears most of the questions. Rest I will go through the sources you mentioned. In the next 2-3 weeks i will be extensively working with Evalglare for my new project, if you could share the new version i could test as well as it would help me, And I could report  bugs if any. 

Best Regards,
Raghu

> On Jul 5, 2016, at 7:53 PM, Jan Wienold <jan.wienold at epfl.ch> wrote:
> 
> 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	
>> 
>> 
>> 
>> 
>>  
>> 
>> 
>> 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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> 
> -- 
> 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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