Object Capture API crash frequently when start generating model

Question

Created Aug ’24

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Participants 2

I have updated the sample code so that the scan will start generating when 15 photos r captured. I hope I can catch this error so the app wont crash.... really need help on this and thank you in advanced !

Hardware Model: iPhone14,2 OS Version: iPhone OS 17.6.1 (21G93)

Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000001, 0x000000023363518c Termination Reason: SIGNAL 5 Trace/BPT trap: 5 Terminating Process: exc handler [525]

Triggered by Thread: 0

Thread 0 name: Thread 0 Crashed: 0 RealityKit_SwiftUI 0x000000023363518c CoveragePointCloudMiniView.interfaceOrientation.getter + 508 (CoveragePointCloudMiniView.swift:0) 1 RealityKit_SwiftUI 0x0000000233634cdc closure #1 in closure #2 in CoveragePointCloudMiniView.body.getter + 124 (CoveragePointCloudMiniView.swift:75) 2 RealityKit_SwiftUI 0x000000023363db9c partial apply for closure #1 in closure #2 in CoveragePointCloudMiniView.body.getter + 20 (<compiler-generated>:0) 3 SwiftUI 0x0000000195c4bbac closure #1 in withTransaction<A>(::) + 276 (Transaction.swift:243) 4 SwiftUI 0x0000000195c4ba90 partial apply for closure #1 in withTransaction<A>(::) + 24 (<compiler-generated>:0) 5 libswiftCore.dylib 0x00000001903f8094 withExtendedLifetime<A, B>(::) + 28 (LifetimeManager.swift:27) 6 SwiftUI 0x0000000195b17d78 withTransaction<A>(::) + 72 (Transaction.swift:228) 7 SwiftUI 0x0000000195b17d04 withAnimation<A>(::) + 116 (Transaction.swift:280) 8 RealityKit_SwiftUI 0x0000000233634bfc closure #2 in CoveragePointCloudMiniView.body.getter + 664 (CoveragePointCloudMiniView.swift:73) 9 SwiftUI 0x0000000195bef134 closure #1 in closure #1 in SubscriptionView.Subscriber.updateValue() + 72 (SubscriptionView.swift:66) 10 SwiftUI 0x0000000195b3f57c thunk for @escaping @callee_guaranteed () -> () + 28 (<compiler-generated>:0) 11 SwiftUI 0x0000000195b3c864 static Update.dispatchActions() + 1140 (Update.swift:151) 12 SwiftUI 0x0000000195b3bedc static Update.end() + 144 (Update.swift:58) 13 SwiftUI 0x0000000195a691fc closure #1 in SubscriptionView.Subscriber.updateValue() + 700 (SubscriptionView.swift:66) 14 SwiftUI 0x0000000195a68eb0 partial apply for thunk for @escaping @callee_guaranteed (@in_guaranteed A.Publisher.Output) -> () + 28 (<compiler-generated>:0) 15 SwiftUI 0x0000000195a68e78 closure #1 in ActionDispatcherSubscriber.respond(to:) + 76 (SubscriptionView.swift:98) 16 SwiftUI 0x0000000195a68c80 ActionDispatcherSubscriber.respond(to:) + 816 (SubscriptionView.swift:97) 17 SwiftUI 0x0000000195a68938 ActionDispatcherSubscriber.receive(:) + 16 (SubscriptionView.swift:110) 18 SwiftUI 0x0000000195a6786c SubscriptionLifetime.Connection.receive(:) + 100 (SubscriptionLifetime.swift:195) 19 Combine 0x000000019aed29d4 Publishers.Autoconnect.Inner.receive(:) + 52 (Autoconnect.swift:142) 20 Combine 0x000000019aed2928 Publishers.Multicast.Inner.receive(:) + 244 (Multicast.swift:211) 21 Combine 0x000000019aed2828 protocol witness for Subscriber.receive(_:) in conformance Publishers.Multicast<A, B>.Inner<A1> + 24 (<compiler-generated>:0)

....

(FBSScene.m:812) 46 FrontBoardServices 0x00000001aa892844 __94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke_2 + 152 (FBSWorkspaceScenesClient.m:692) 47 FrontBoardServices 0x00000001aa8926cc -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 168 (FBSWorkspace.m:411) 48 FrontBoardServices 0x00000001aa8977fc __94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke + 344 (FBSWorkspaceScenesClient.m:691) 49 libdispatch.dylib 0x00000001999aedd4 _dispatch_client_callout + 20 (object.m:576) 50 libdispatch.dylib 0x00000001999b286c _dispatch_block_invoke_direct + 288 (queue.c:511) 51 FrontBoardServices 0x00000001aa893d58 FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK + 52 (FBSSerialQueue.m:285) 52 FrontBoardServices 0x00000001aa893cd8 -[FBSMainRunLoopSerialQueue _targetQueue_performNextIfPossible] + 240 (FBSSerialQueue.m:309) 53 FrontBoardServices 0x00000001aa893bb0 -[FBSMainRunLoopSerialQueue performNextFromRunLoopSource] + 28 (FBSSerialQueue.m:322) 54 CoreFoundation 0x0000000191adb834 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 28 (CFRunLoop.c:1957) 55 CoreFoundation 0x0000000191adb7c8 __CFRunLoopDoSource0 + 176 (CFRunLoop.c:2001) 56 CoreFoundation 0x0000000191ad92f8 __CFRunLoopDoSources0 + 340 (CFRunLoop.c:2046) 57 CoreFoundation 0x0000000191ad8484 __CFRunLoopRun + 828 (CFRunLoop.c:2955) 58 CoreFoundation 0x0000000191ad7cd8 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420) 59 GraphicsServices 0x00000001d65251a8 GSEventRunModal + 164 (GSEvent.c:2196) 60 UIKitCore 0x0000000194111ae8 -[UIApplication run] + 888 (UIApplication.m:3713) 61 UIKitCore 0x00000001941c5d98 UIApplicationMain + 340 (UIApplication.m:5303) 62 SwiftUI 0x0000000195ccc294 closure #1 in KitRendererCommon(:) + 168 (UIKitApp.swift:51) 63 SwiftUI 0x0000000195c78860 runApp<A>(:) + 152 (UIKitApp.swift:14) 64 SwiftUI 0x0000000195c8461c static App.main() + 132 (App.swift:114) 65 SoleFit 0x0000000103046cd4 static SoleFitApp.$main() + 24 (SoleFitApp.swift:0) 66 SoleFit 0x0000000103046cd4 main + 36 67 dyld 0x00000001b52af154 start + 2356 (dyldMain.cpp:1298)

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Answer 1

Engineer OP

Apple

Aug ’24

Thanks for your interest in Object Capture!

We've looked at the stack trace you posted and it's not clear from just this callstack what the root issue is. SIGTRAP typically means there is an assertion in the code due to some expected condition not being true. We recommend you file a bug report (https://developer.apple.com/bug-reporting/) which will provide more information to help us determine the actual issue.

A few things to note when filing feedback or debugging this: if we understand what you are trying to do, you want to run a PhotogrammetrySession to reconstruct after only 15 images were captured? Was the reconstruction session running when this error occurred? Please provide more details on the explicit pathway through the API that was used.

The SIGTRAP seems to be occurring in the front end UI for ObjectCaptureSession, not reconstruction. Since both these sessions use significant iOS resources on their own, we recommend tearing down the capture UI fully before starting reconstruction. Also, since images are saved asynchronously, be sure you call finish() on the ObjectCaptureSession and wait for the session to finish writing images and enter the .completed state before tearing down the capture session and starting the reconstruction session.

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