[Radiance-general] Clarification of Evalglare Output
Raghuram Kalyanam
kalyanam at rhrk.uni-kl.de
Wed Jul 6 06:59:45 PDT 2016
Hi Jan,
In one of my simulations, I got Max_Lum as 8047776.5. I expected Max_Lum to be maximum of the luminance of all the pixels in the image, on a brightest sunny it could be 120000 lux, but how is this value higher than the later? Let me know if this variable means some thing different. I am using version 1.17
From Yesterdays questions, What does Indirect vertical Illuminance mean(Is this the effect of Background Luminance)? does this satisfy the equation E_vert=E_dir+E_indir ? where E_indir is Indirect vertical Illuminance.
I could find some docs which explains Lveil_cie but i am not clear. What does its value signifies? Similarly with Eglare_cie
Thanks & 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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>
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>
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