ILCCP Stripping removes Object Detection (Unity 6 LTS, 3.16)

Bug Reports
1

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

  • Host machine & OS version: Mac M4 OS 26
  • Issue Environment : On Device, iPhone 16 Pro, OS 26
  • Xcode version: 26
  • ARDK version: 3.16
  • Unity version: Unity 6 LTS .53f1

Bug reproduction steps:

When building a project using the versions above to device, Unity strips Object detection (on medium and high). Setting the stripping level to low resolves this issue.

MissingMethodException: Default constructor not found for type Niantic.Lightship.AR.Subsystems.ObjectDetection.LightshipObjectDetectionSubsystem+LightshipObjectDetectionProvider

at System.RuntimeType.CreateInstanceMono (System.Boolean nonPublic, System.Boolean wrapExceptions) [0x00000] in <00000000000000000000000000000000>:0

at UnityEngine.SubsystemsImplementation.SubsystemDescriptorWithProvider`2[TSubsystem,TProvider].CreateProvider () [0x00000] in <00000000000000000000000000000000>:0

at UnityEngine.SubsystemsImplementation.SubsystemDescriptorWithProvider`2[TSubsystem,TProvider].Create () [0x00000] in <00000000000000000000000000000000>:0

at UnityEngine.XR.Management.XRLoaderHelper.CreateSubsystem[TDescriptor,TSubsystem] (System.Collections.Generic.List`1[T] descriptors, System.String id) [0x00000] in <00000000000000000000000000000000>:0

at Niantic.Lightship.AR.Loader.NativeLoaderHelper.Initialize (Niantic.Lightship.AR.Loader.ILightshipInternalLoaderSupport loader, System.Boolean isLidarSupported) [0x00000] in <00000000000000000000000000000000>:0

at Niantic.Lightship.AR.Loader.LightshipLoaderHelper.Initialize (Niantic.Lightship.AR.Loader.ILightshipInternalLoaderSupport loader) [0x00000] in <00000000000000000000000000000000>:0

at UnityEngine.XR.Management.XRManagerSettings.InitializeLoaderSync () [0x00000] in <00000000000000000000000000000000>:0

at UnityEngine.XR.Management.XRGeneralSettings.InitXRSDK () [0x00000] in <00000000000000000000000000000000>:0

2

Hi Tobias,

May I know what you mean by stripping Object Detection? Do you just mean that it does away with the code? I was able to replicate this on both iOS and Android using our Samples package. It built and the home scene opened just fine but when I opened the Object Detection sample it was just a black screen and no camera permission prompt. After setting the level back to Low I got the permission prompt and a camera feed again.

I’ve let our team know about this and I’ll get back to you on why this happens as soon as I have additional info. May I also know why you’re trying to use a higher Strip setting?

3

Yes it essentially removed the Object detection library so it will not run on device. I used the stripping to reduce app build size and improve runtime performance.

4

Got it. It’s not clear to me at the moment if ARDK projects require this setting to be at a specific level so I’ve gone ahead and treated it as a bug and raised it to our developers. Please do note that I can’t guarantee if/when this will be addressed

5

Thank you, Jesus :slight_smile: