Page 2 of 2
Re: Emission node problems
Posted: Fri Oct 11, 2019 3:21 pm
by Dade
We could add a "normalize" flag to blackbody texture so it may be easier to use by providing a [0.0, 1.0] values
Re: Emission node problems
Posted: Fri Oct 11, 2019 7:04 pm
by marcatore
Dade wrote: Fri Oct 11, 2019 3:21 pm
We could add a "normalize" flag to blackbody texture so it may be easier to use by providing a [0.0, 1.0] values
In my opinion this is more useful, cause, at the end, what we need (at least me) is to have the "correct" color with a specific color temperature.
It's easier to setup a scene in that way.
Re: Emission node problems
Posted: Sat Oct 12, 2019 12:51 pm
by Dade
I added an option to normalize BlackBody texture output:
Code: Select all
scene.textures.<texture name>.type = blackbody
scene.textures.<texture name>.temperature = 6500
scene.textures.<texture name>.normalize = 1
Anyway, you can already scale the output or set the gain to 1/89159.6 to obtain the same result.
Re: Emission node problems
Posted: Sun Dec 29, 2019 11:03 am
by marcatore
Dade, I've tested the Normalize option but there is something I cant' understand.
Using daily build.
Using an area light with "power" unit mode.
Added a blackbody node to the light.
Normalize OFF
Normalize ON
Using two area lights with "artistic" unit mode trying to match light emitted
With Normalize ON
With Normalize OFF
Re: Emission node problems
Posted: Mon Dec 30, 2019 10:50 am
by Dade
marcatore wrote: Sun Dec 29, 2019 11:03 am
Dade, I've tested the Normalize option but there is something I cant' understand.
But what is exactly that you can't understand
Re: Emission node problems
Posted: Mon Dec 30, 2019 12:26 pm
by marcatore
I can't understand that you wrote "Anyway, you can already scale the output or set the gain to 1/89159.6 to obtain the same result." but, from my tests, is clearly that it's not like this.
So, if it should be the same, why the color is different if you use or not the normalize option?
And, speaking about the hue of the light, I can say that the unnormalized(but scaled as suggested) version is the color I'm expecting from a 2700°K light source.
Re: Emission node problems
Posted: Wed Jan 01, 2020 12:25 pm
by Dade
marcatore wrote: Mon Dec 30, 2019 12:26 pm
I can't understand that you wrote "Anyway, you can already scale the output or set the gain to 1/89159.6 to obtain the same result." but, from my tests, is clearly that it's not like this.
So, if it should be the same, why the color is different if you use or not the normalize option?
And, speaking about the hue of the light, I can say that the unnormalized(but scaled as suggested) version is the color I'm expecting from a 2700°K light source.
This was (mostly) due to the presence of a clamp of the result between 0.0 and 1.0. I removed the clamp so it should have now the expected behavior.
Re: Emission node problems
Posted: Thu Jan 02, 2020 2:18 pm
by marcatore
Tested and now they've the same hue.
Thank you