Colour correcting HDRIs

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Birkkromann
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Colour correcting HDRIs

Post by Birkkromann »

First of all, I absolutely love Luxcore! It's everything I was missing in cycles.

Usually in cycles I would alter the colour of my HDRI by adding a hue/saturation node in the world tab, but I can't find anywhere in Luxcore where you can change the HDRI other than in the world tab.

Is it possible, or will I have to do the corrections in Photoshop?
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Sharlybg
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Re: Colour correcting HDRIs

Post by Sharlybg »

Welcome Birk !

Currently you have two way to change your HDRi color first :
HDR.jpg
The second fashion is by lightgroups :

https://youtu.be/Lsz9yx6GM7I
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Birkkromann
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Re: Colour correcting HDRIs

Post by Birkkromann »

Sharly, first of all, thank you so much for all your tutorials!
When I change the tint nothing happens?
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B.Y.O.B.
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Re: Colour correcting HDRIs

Post by B.Y.O.B. »

Birkkromann wrote: Tue Apr 21, 2020 4:14 pm When I change the tint nothing happens?
Apparently it broke during the light settings rework in v2.3.
Birkkromann
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Re: Colour correcting HDRIs

Post by Birkkromann »

B.Y.O.B. wrote: Tue Apr 21, 2020 4:19 pm Apparently it broke during the light settings rework in v2.3.
Is there anything else I can do to change the colour of the HDRI?
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B.Y.O.B.
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Re: Colour correcting HDRIs

Post by B.Y.O.B. »

Light sources in LuxCore currently do not support arbitrary texture node trees, so the answer is that you need an external program.
You can make a feature request for light source node trees by opening an issue here: https://github.com/LuxCoreRender/LuxCore/issues
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Dade
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Re: Colour correcting HDRIs

Post by Dade »

B.Y.O.B. wrote: Tue Apr 21, 2020 4:52 pm Light sources in LuxCore currently do not support arbitrary texture node trees
The general idea is that anything doable at pre-processing stage, should be. We have already many type of image maps pre-processing (i.e. gamma revers, channel selection, grey scale, etc.): adding HSV balancing would be quite easy :idea:

P.S. I don't have the time but if someone want, it should be easy.
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B.Y.O.B.
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Re: Colour correcting HDRIs

Post by B.Y.O.B. »

I'm thinking more in the direction of applying arbitrary node trees to image pixels during pre-processing. Of course it only makes sense if the image is only used in one place (otherwise we would have to make a copy per differing node tree) but for env. light HDRIs, it would be perfect.
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Re: Colour correcting HDRIs

Post by CodeHD »

Dade wrote: Tue Apr 21, 2020 8:21 pm P.S. I don't have the time but if someone want, it should be easy.
I would volunteer, it could be another good exercise task for me ;)
But I'm also too busy for one more week, could start it end of next week if it can wait. Otherwise, other volunteers ahead :D
Birkkromann
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Re: Colour correcting HDRIs

Post by Birkkromann »

This is why I much prefer more independent render engines! There's actual people to chat with and an eagerness to make changes and implement new features :)
I'm currently doing tests to find out whether cycles, Luxcore or Octane best suit my workflow.
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