Regression on Unity 2020.3.22f1 (iOS) with "Post Processing" unchecked

Target Platforms Mobile
1

Hi,

I noticed a regression between Unity 2020.3.21f1 and Unity 2020.3.22f1 on iOS (Metal) with URP.
I have now a sort of white borders instead of transparency on some of my 3D Objects (not on UI).
This occurs only if the “Post Processing” checkbox on the main camera is unchecked.
If I check the “Post Processing” button on my camera, these artifacts disappear!

It’s easy to reproduce:
→ Create a new URP project.
→ Create a material with a texture with alpha channel and apply to a cube.
→ Uncheck “Post Processing” checkbox on the main camera.
→ Build on iOS (works on Macos Editor).

7647196--953326--bug1.jpg 7647196--953329--bug2.jpg

I tried to update first URP package from 10.6 to 10.7 before updating to 2020.3.22f1: it worked.
So it’s only after updating to 2020.3.22f1 that the problem occurs.

PS: Not sure if it’s the same problem but I noticed too that if I set the background camera color to black (instead of Skybox), the background appears WHITE on iOS if “Post processing” is unchecked…

Shader not working correctly on iOS after 2018->2020 upgrade
2

I’ve just reported the bug (case 1380005).

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3

Happens on built-in render pipeline as well, with no workarounds that I could find.

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4

Public issue now open: Unity Issue Tracker - White borders appear around a texture when Post Processing is unchecked in iOS

5

Can you please try to put your device in Dark Mode and see if it helps?

6

@xyome : yes, I’ve just tested and in Dark Mode it works without problem!

7

@SarperS We had the same problem on the builtin pipeline and we ended up using basic surface shaders to replace the fragment shaders that caused the problem.

8

Thanks, I can’t do that sadly, I use custom lighting in my shaders. Gonna stick with not updating Unity for iOS builds for now :confused:

9

Until this gets fixed, you can force your app to always be in dark mode by adding
<key>UIUserInterfaceStyle</key><string>Dark</string>
to the info.plist file in Xcode (or with a build script).

4 Likes