Improve post-process color correction by supporting 3D LUTs instead of a single Gradient

[Darkinggq]

Describe the project you are working on:
Godot Editor, I will decide to work on ARPG 3D (low poly)

Describe the problem or limitation you are having in your project:
Godot need to improve post process (LUTs) for Color Grading very helpful

Area Post Process Box example hit inside color change other different colors

Describe the feature / enhancement and how it helps to overcome the problem or limitation:
description here

https://docs.unrealengine.com/en-US/Engine/Rendering/PostProcessEffects/UsingLUTs/index.html

example screenshot to the left or to the right the color is different depends on customize for the designer

Describe how your proposal will work, with code, pseudocode, mockups, and/or diagrams:
.......

If this enhancement will not be used often, can it be worked around with a few lines of script?:
.......

Is there a reason why this should be core and not an add-on in the asset library?:
Post Process is very useful for realistic graphic games, if without it it would be very bad, this is for 3D AAA studio games (of course the core)

[Calinou]

See also #903.

[fire]

This pull request can be updated for 4.0 if you're interested. godotengine/godot#26101

It's less hard than #903.

[Darkinggq]

This pull request can be updated for 4.0 if you're interested. godotengine/godot#26101

yeah i'm see

[fire]

I ran out of effort, but you can see my last pr. The vulkan render isn't showing the 3d lut.

godotengine/godot#42761

[fire]

See updated pr.

[Darkinggq]

checking now :)

[Jummit]

Isn't this added in godotengine/godot#42761?

[clayjohn]

Isn't this added in godotengine/godot#42761?

Yep. Closing as it has been added. :)