[REQ] light level / radiance
[REQ] light level / radiance
I'm hoping this could be done without too much fuss.
Currently Indigo doesn't do light level / radiance readings / output, so this has to be done using some other software (Indigo remains rendering solution of choice).
In the present IES files have to be loaded/linked using skIndigo (or whatever other exporter you use) for rendering and again the same in the other software (eg. LightUp) for lighting level / radiance readings. Will it be possible to set these sources up on a separate layer (linking the IES files with an extension like GOSU) and have skIndigo read the IES files this way?
I suppose the other option is to have lighting level / radiance readings output from Indigo.
Currently Indigo doesn't do light level / radiance readings / output, so this has to be done using some other software (Indigo remains rendering solution of choice).
In the present IES files have to be loaded/linked using skIndigo (or whatever other exporter you use) for rendering and again the same in the other software (eg. LightUp) for lighting level / radiance readings. Will it be possible to set these sources up on a separate layer (linking the IES files with an extension like GOSU) and have skIndigo read the IES files this way?
I suppose the other option is to have lighting level / radiance readings output from Indigo.
Indigo 4 | skIndigo | SUpro 2018
Re: [REQ] light level / radiance
Big bump from the grave. Any feedback here? I was considering going to Thea, that has this already built-in (and seems to be a decent enough rendering software), but decided to wait and see what develops with Indigo.
Doing lighting analysis (radiance / illumination) is a real PITA when you need to set it up again in another software, especially when you need to do changes.
Doing lighting analysis (radiance / illumination) is a real PITA when you need to set it up again in another software, especially when you need to do changes.
Indigo 4 | skIndigo | SUpro 2018
Re: [REQ] light level / radiance
Ahem *cough cough*
This is what we're talking about...
Anybody from the dev team? No interest in pursuing this at all? Some feedback would be great...
This is what we're talking about...
Anybody from the dev team? No interest in pursuing this at all? Some feedback would be great...
Indigo 4 | skIndigo | SUpro 2018
Re: [REQ] light level / radiance
Hi Juju,
THis would be cool to add, we just have a lot of stuff to do right now.
Maybe after 4.0 is done.
THis would be cool to add, we just have a lot of stuff to do right now.
Maybe after 4.0 is done.
Re: [REQ] light level / radiance
Hi Ono, thanks for the reply.OnoSendai wrote:Hi Juju,
THis would be cool to add, we just have a lot of stuff to do right now.
Maybe after 4.0 is done.
Understandably so, are we talking version 4.2-ish or version 5plus-ish.
I don't suppose Glare has a roadmap of sorts for Indigo?
Indigo 4 | skIndigo | SUpro 2018
Re: [REQ] light level / radiance
That would be great!
Last edited by Jay-ko on Thu Feb 02, 2017 2:55 am, edited 1 time in total.
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- Oscar J
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Re: [REQ] light level / radiance
Could be integrated as a rendering pass/channel.
Re: [REQ] light level / radiance
Imagine what my first thought was after I saw the version 4 stable release notice in my e-mail?!
Pretty please?
Indigo 4 | skIndigo | SUpro 2018
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Re: [REQ] light level / radiance
I'm wondering to what extent this could be done using the untonemapped EXR (linear, scene-referred) from Indigo already.
Given that we can define the reflectance of a grey surface, and a specify a light source with a specific power / wattage, wouldn't you be able to turn the linear EXR values into useful radiance values or something?
You could run it through a simple Gain adjustment (mapping the EXR to some radiance scale) and a LUT to get the color gradient.
Or am I missing something painfully obvious.. ?
Given that we can define the reflectance of a grey surface, and a specify a light source with a specific power / wattage, wouldn't you be able to turn the linear EXR values into useful radiance values or something?
You could run it through a simple Gain adjustment (mapping the EXR to some radiance scale) and a LUT to get the color gradient.
Or am I missing something painfully obvious.. ?
Re: [REQ] light level / radiance
Getting a colorized image representing illumination level is only part of the requirement of a photometric report / analysis. A scale against which this is measured (accurately relevant to certain lux levels, with some kind of lux colour chart; min / max / average luminance) and a report of sorts. Hopefully some kind of picker to pinpoint / query illumination at specific position (as per picker).
If the computational part of it is easy enough to accomplish already, it would mean that this should be fairly easy to implement, for a start anyhow. (What do I know?)
Take a look at how LightUp and TheaRender approaches this. The idea is to get to the level of what DIALux / RELUX has to offer, except the artistic rendering is much better with Indigo and you don't have to redo any work (in other software) to get an accurate Photometric Analysis (indoor and / or outdoor) from your model.
Ideally I wouldn't have to go fiddle with various render options and settings and and and, just be able to choose a menu item for Photometric Analysis (or report or whatever you want to call it) and start it from there. Probably a few other minor items to input / choose, but essentially fairly easy to use at the end.
If the computational part of it is easy enough to accomplish already, it would mean that this should be fairly easy to implement, for a start anyhow. (What do I know?)
Take a look at how LightUp and TheaRender approaches this. The idea is to get to the level of what DIALux / RELUX has to offer, except the artistic rendering is much better with Indigo and you don't have to redo any work (in other software) to get an accurate Photometric Analysis (indoor and / or outdoor) from your model.
Ideally I wouldn't have to go fiddle with various render options and settings and and and, just be able to choose a menu item for Photometric Analysis (or report or whatever you want to call it) and start it from there. Probably a few other minor items to input / choose, but essentially fairly easy to use at the end.
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Re: [REQ] light level / radiance
This would be a valuable addition, very precious! GoGo!
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Re: [REQ] light level / radiance
On this topic, how would one get a pixel value of 1.0 from a lightsource emitting 1 lux?
- I've set the tonemapping to linear - though this surely is bypassed when exporting an untonemapped EXR?
- turned off vignetting for the camera,
- set exposure to 1 (second),
- f-stop to 1.0,
- the emitter is uniform, with an emittance scale of 1 lux and a diffuse color of (0,0,0).
- I'm getting a value of about 0.718 in the EXR.
- I have 3 light sources (planes), each 1x1 metres, each with a double emittance (1 lux, 2 lux, 4 lux). These values seem to scale roughly correctly (0.718, 1.436, 2.88).
Re: [REQ] light level / radiance
Also take into account what reflectance the surface (-s) have, the size of the space. Keep in mind that the calculations use the centre of the light source as origin, thus using a surface of 1x1m may not be accurate.
I assume you're trying to simulate using the point method? Try doing the simulation calculation manually first, then see how the simulation compares.
I assume you're trying to simulate using the point method? Try doing the simulation calculation manually first, then see how the simulation compares.
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