URP: Washed out color in gamma & lineair color space

[Jelmer_Verhoog]

Include the following details while filing a bug report (edit as applicable):

• Issue category: ARDK core system?
• Device type & OS version: iOS 16 on iPhone 12 pro
• Host machine & OS version: Mac with Monterey
• Issue Environment : On Device
• Xcode version: 14.0
• ARDK version: 2.2
• Unity version: 2021.3.9

Bug reproduction steps:
Setup ARDK with URP pipeline.
Build the app.
Observe that the colors in video background look washed out.
This happen with both gamma and lineair color space.

[rob_link]

Hello @Jelmer_Verhoog,

We were able to reproduce this issue and have filed a report to inform the team.
If you’d like a temporarily solution in the meantime, you can make a couple of changes to the following two shaders:

1. Open the ARCoreFrame.shader file and add the following lines around line 150:

#if !defined(UNITY_COLORSPACE_GAMMA)
    color.rgb = pow(color.rgb, vec3(2.2));
#endif

2. Open the ARKitFrame.shader file and add the following lines around line 150:

#if !defined(UNITY_COLORSPACE_GAMMA)
    out_color.rgb = pow(out_color.rgb, 2.2);
#endif

Altering these two shaders this way should reduce the wash-out effect in your URP builds while the team works on a more permanent solution in a future ARDK release.