Luminance/Illuminance Analysis

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sirrodney
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Fri May 20, 2011 7:43 pm

Guys this is outstanding!!.. I've been using Mental Ray/Max for lighting studies - thinking no way can it give the correct result..if you switch to Iray it won't work at all. Having this in Thea, producing calc's you can have some faith in is a dream come true. Massive thank you to the team!
onrender
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Fri May 20, 2011 9:03 pm

:idea: ;) You were quiet quick. Congratulation !
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Zacchia
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Fri May 20, 2011 10:18 pm

Jakchit wrote:I hope to someday be advanced enough to understand what this even means :) I love it though.
:lol: you speak from my heart... it sounds all good but... :lol:
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sirrodney
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Fri May 20, 2011 11:35 pm

These are about lighting analysis in Max but they are a very good primer for anyone who's new to this and a bit mystified..
http://images.autodesk.com/adsk/files/3 ... tarted.pdf
http://images.autodesk.com/adsk/files/3 ... vanced.pdf

also..maybe buy a cheap lux light meter (ebay £15-£25) and you can measure light levels indoors and outdoors etc, and compare readings in your renderings to real world light levels..
Ayo
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Sat May 21, 2011 6:07 pm

This is great news! Having been using Ecotect + Radiance for daylighting analysis, and being frustrated by the antiquated user interface, I can't wait to try this new feature. However, Radiance software has been vetted by Lawrence Berkeley Labs as producing accurate approximations of light levels. I assume that Thea is at least as accurate as Radiance. Can anyone confirm?
tarbox_oj
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Sun May 22, 2011 3:36 am

Giannis wrote:
In addition to the false color rendering, user can select regions of interest, find the extreme points and check the distribution of values with the available histograms.
Can user select irregular shape to cover a region?

For ease of understanding, I still think the measurements should be expressed in “LUX” or “LUMEN”.
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giannis
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Sun May 22, 2011 5:46 am

@Ayo:
The analysis is based on the render engine simulation, so it is at least as accurate as "X" renderer.

@tarbox_oj:
You are right, we could use lux for illuminance. Still, I like it as it stands now. :)
User can only select rectangular regions of interest.

best wishes
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dale
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Mon May 30, 2011 3:18 pm

I was bragging to our electrical engineer that we could actually render with the exact IES values of the specified fixtures, now I can actually show him the results!
Wow!
Thank you once again.
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eph
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Tue May 31, 2011 10:17 am

giannis wrote:@tarbox_oj:
You are right, we could use lux for illuminance. Still, I like it as it stands now. :)
User can only select rectangular regions of interest.
Hey Giannis, I would also like to plead for an illumination option. I agree both are useful, but lux are more handy in practical use.
I.e. office illumination is always expressed as "x lux (normally 300-450) at an average at desk height, with a certain uniformity (0,8)". In this case polygon selections could make up for perspective correction as well ;) but I agree this is far less important than the ability to actually measure the illumination itself.

As a side note, for those interested in light (and its influences on the material lab settings), this is a really interesting document: http://www.opticalres.com/lt/illuminationfund.pdf
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eph
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Tue May 31, 2011 10:38 am

2nd suggestion: maybe it could be handy to show the (il)luminance information in a logarithmic fashion. Light sources are always lots brighter, and that way it would be possible to measure both darker and bright areas in 1 single readout.
Especially since perceived brightness should be similar to the logarithm of luminance...
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