Shader not working with HDR 2D enabled | Godot Café | Page 1

somber citrus Aug 11, 2025, 4:58 PM

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Edit:
The shader works only when HDR 2D is disabled. Is it possible to somehow keep the shader working with HDR 2D enabled? I really want to keep the glow effect.

Hello, I recently found a great shader that converts red and green values of a sprite as UV coordinates to replace them with color from another texture. Few things changed since the 4.2.1 version but I am unable to get it to work.

There is a link to where I found the shader:
https://forum.godotengine.org/t/creating-a-2d-sprite-skin-based-on-a-uv-map/42078

Godot_v4.4.1-stable_win64_2InLBpGkmY.png

Godot Forum

Creating a 2D sprite skin based on a UV map

Godot Version 4.2.1.stable.mono Question I will preface this by saying I am completely new to shaders. I have been trying to implement a shader for my 2D player sprite that maps a color from a “skin texture” to the player sprite, based on the sprite’s RGBA value. This is based on Aarthificial’s popular youtube video, so check it out and...

tardy abyss Aug 11, 2025, 5:03 PM

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somber citrus Edit: The shader works only when HDR 2D is disabled. Is it possible to somehow k...

maybe it's because the shaders arent identical?
in the one in 4.4.1 the pixel coords also get floored.

somber citrus Aug 11, 2025, 5:05 PM

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tardy abyss maybe it's because the shaders arent identical? in the one in 4.4.1 the pixel co...

oh I forgot to change it but it does the same thing even when I change it to the original

tardy abyss Aug 11, 2025, 5:06 PM

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also are the skin dimensions just the size of the skin-texture? because there is also a function to get the dimensions of a texture inside the shader, called texturesize(). would at least remove one of the variables.

somber citrus Aug 11, 2025, 5:07 PM

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tardy abyss also are the skin dimensions just the size of the skin-texture? because there is...

yes it can be replaced

tardy abyss Aug 11, 2025, 5:09 PM

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i see. Well then maybe the color format of the texture somehow got changed? for that i would look in the import tab of the texture and see if it uses a different color format.

somber citrus Aug 11, 2025, 5:12 PM

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every setting is identical to 4.2.1 settings

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Now I figured out that it's not the version, it must be some project setting that I changed because it works in a new 4.4.1 project

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I found it

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it was the HDR 2D settings that messed everything up

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only bad thing is that I can't keep the glow effect with this setting on

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Shader not working with HDR 2D enabled

tardy abyss Aug 11, 2025, 5:36 PM

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and i would have thought that the hdr color correction would happen afterwards.

tardy abyss Aug 11, 2025, 5:37 PM

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somber citrus only bad thing is that I can't keep the glow effect with this setting on

maybe try ticking hdr as srgb?

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(and then reimporting of course)

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oh wait no that seems to have a different usage.

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i must admit that hdr affecting shaders in that way kinda sounds like a bug, so i might suggest reporting it. at the very least someone there should be able to tell you what you have to do different with hdr enabled.

somber citrus Aug 11, 2025, 5:46 PM

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I think that it is possible that it changes how colors work, but I'm unable to revert this setting only for one sprite

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maybe I could draw character on another viewport as a temporary fix

tardy abyss Aug 11, 2025, 5:49 PM

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i'm kinda at a loss here, sorry.

somber citrus Aug 11, 2025, 5:51 PM

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It's okay, I would not figure this out without you, because I never thought it could be just some setting

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thank you

tardy abyss Aug 11, 2025, 6:20 PM

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i might recommend asking inside #shaders-and-vfx (linking to this entry). maybe you find someone more experienced in that subject.

#Shader not working with HDR 2D enabled