iOS build: Adding UnityGLTFShaderVariantCollection-BiRP breaks build

[derwaldgeist]

Describe the bug 💬

I've followed the advice to include the shader library as described here:
https://github.com/KhronosGroup/UnityGLTF?tab=readme-ov-file#ensure-shaders-are-available-in-your-build

After I did this, my iOS builds break.

Right after app start (before even the splash screen appears), Xcode stops the app with this error:

Script error: OnTriggerEnter2D
This message parameter has to be of type: [UNREGISTERED]
The message will be ignored.
The referenced script (Unknown) on this Behaviour is missing!
The referenced script on this Behaviour (Game Object '<null>') is missing!

EDIT: These errors are actually UNRELATED and also occur in a working build. The crash occurs right after them, that's why I had mentioned these errors. In a working build, the next Xcode output is this:

XRGeneral Settings awakening...
UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
UnityEngine.Logger:Log(LogType, Object)
UnityEngine.Debug:Log(Object)
UnityEngine.XR.Management.XRGeneralSettings:Awake() (at ./Library/PackageCache/com.unity.xr.management@4.5.0/Runtime/XRGeneralSettings.cs:91)

So maybe the crash happens in this package? Dunno.

If I remove UnityGLTFShaderVariantCollection-BiRP again, it just works fine.

Steps to reproduce 🔢

1. Add UnityGLTFShaderVariantCollection-BiRP to Unity 2022.3.62f3
2. Create an iOS build
3. Run it on a device

Files to reproduce the issue ♻

No response

Editor Version 🎲

2022.3

Render Pipeline and version

Built in Render Pipeline

UnityGLTF Version

2.17.8 (also tried with the latest version)

Operating System 👩‍💻

iOS

When does this problem happen?

• Editor Import
• Runtime Import
• Editor Export
• Runtime Export

Additional Info 📜

No response

Validations 🩹

• I have searched existing issues: no issue already exist that reports the same problem.
• I follow the Code of Conduct
• I provided a minimal reproducible example, including files when necessary.

[derwaldgeist]

That's what I see in the debugger window:

Maybe some sort of out-of-memory error?

[robertdorn83]

hey, yeah...maybe. For mobile , i would recommend to create a custom variant collection specific for your needs. Or make a copy of the existing and remove unused variants. The prebuilded collections contains all possible shader features, which is quite a lot for mobile devices.

[derwaldgeist]

Yep, that's what I now also learned. I removed all of them, and the models I need work without them (so far).

[hybridherbst]

For completeness, what iOS device model/make are you using that crashes with the variants?

[derwaldgeist]

@hybridherbst: I am using an iPhone 16 Pro Max. Export is from Unity 2022.3.62f3. If I understand the error correctly, iOS killed the app right on startup because the memory consumption exceeded 3 GB. I had excluded the 2 passes for URP, since my app is BiRP only. It's also worth noting that pre-compiling the shaders took "ages", even on my maxed-out M3 Mac. So it must have a been a lot of shaders...