Chaos vehicle component breaks in 5.3

CVMVSS · July 31, 2023, 4:08am

I work with blueprint chaos, animation, physical components, control rigs and notice strange behavior, as if physics at one moment ceases to be controlled by the new settings of one of these blueprints. This happened before, the solution was to restart the engine, but in 5.3, after restarting, the blueprint based on the Chaos Vehicle loses the functionality of its component - all settings for mechanics, wheels, skeleton and other things disappear. It is impossible to delete a component, it is only possible to duplicate it, and for some reason the duplicated component displays its settings (but by default), but the blueprint with the duplicated component does not work. I tried to reappend the blueprint class to other working blueprints and still the component does not work.
When trying to run the simulation in the viewport, anril crashes with the following error:

LoginId:9f31afc58b814e8ea4d820590ca8d363-000003e8
EpicAccountId:

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:Runtime/Core/Public/Containers/Array.h] [Line: 771] Array index out of bounds: 0 from an array of size 0

libUnrealEditor-CoreUObject.so!UFunction::Invoke(UObject*, FFrame&, void*) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/CoreUObject/Private/UObject/Class.cpp:6659]
libUnrealEditor-CoreUObject.so!UObject::CallFunction(FFrame&, void*, UFunction*) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/CoreUObject/Private/UObject/ScriptCore.cpp:1139]
libUnrealEditor-CoreUObject.so!UObject::execFinalFunction(UObject*, FFrame&, void*) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/CoreUObject/Private/UObject/ScriptCore.cpp:3210]
libUnrealEditor-CoreUObject.so!UObject::ProcessContextOpcode(FFrame&, void*, bool) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/CoreUObject/Private/UObject/ScriptCore.cpp:3091]
libUnrealEditor-CoreUObject.so!UObject::execLet(UObject*, FFrame&, void*) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/CoreUObject/Private/UObject/ScriptCore.cpp:2834]
libUnrealEditor-CoreUObject.so!ProcessLocalScriptFunction(UObject*, FFrame&, void*) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/CoreUObject/Private/UObject/ScriptCore.cpp:1236]
libUnrealEditor-CoreUObject.so!void ProcessScriptFunction<void (*)(UObject*, FFrame&, void*)>(UObject*, UFunction*, FFrame&, void*, void (*)(UObject*, FFrame&, void*)) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/CoreUObject/Private/UObject/ScriptCore.cpp:1036]
libUnrealEditor-CoreUObject.so!ProcessLocalFunction(UObject*, UFunction*, FFrame&, void*) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/CoreUObject/Private/UObject/ScriptCore.cpp:1279]
libUnrealEditor-CoreUObject.so!UObject::execLocalFinalFunction(UObject*, FFrame&, void*) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/CoreUObject/Private/UObject/ScriptCore.cpp:3224]
libUnrealEditor-CoreUObject.so!ProcessLocalScriptFunction(UObject*, FFrame&, void*) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/CoreUObject/Private/UObject/ScriptCore.cpp:1236]
libUnrealEditor-CoreUObject.so!UFunction::Invoke(UObject*, FFrame&, void*) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/CoreUObject/Private/UObject/Class.cpp:6659]
libUnrealEditor-CoreUObject.so!UObject::ProcessEvent(UFunction*, void*) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/CoreUObject/Private/UObject/ScriptCore.cpp:2143]
libUnrealEditor-Engine.so!AActor::ProcessEvent(UFunction*, void*) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/Engine/Private/Actor.cpp:1122]
libUnrealEditor-Engine.so!AActor::Tick(float) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/Engine/Private/Actor.cpp:1526]
libUnrealEditor-Engine.so!FActorTickFunction::ExecuteTick(float, ELevelTick, ENamedThreads::Type, TRefCountPtr<FGraphEvent> const&) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/Engine/Private/Actor.cpp:251]
libUnrealEditor-Engine.so!FTickFunctionTask::DoTask(ENamedThreads::Type, TRefCountPtr<FGraphEvent> const&) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/Engine/Private/TickTaskManager.cpp:275]
libUnrealEditor-Engine.so!TGraphTask<FTickFunctionTask>::ExecuteTask(TArray<FBaseGraphTask*, TSizedDefaultAllocator<32> >&, ENamedThreads::Type, bool) [/mnt/horde/++UE5/Sync/Engine/Source/Runtime/Core/Public/Async/TaskGraphInterfaces.h:1265]
libUnrealEditor-Core.so!FNamedTaskThread::ProcessTasksNamedThread(int, bool) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/Core/Private/Async/TaskGraph.cpp:758]
libUnrealEditor-Core.so!FNamedTaskThread::ProcessTasksUntilQuit(int) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/Core/Private/Async/TaskGraph.cpp:648]
libUnrealEditor-Core.so!FTaskGraphCompatibilityImplementation::WaitUntilTasksComplete(TArray<TRefCountPtr<FGraphEvent>, TSizedInlineAllocator<4u, 32, TSizedDefaultAllocator<32> > > const&, ENamedThreads::Type) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/Core/Private/Async/TaskGraph.cpp:2125]
libUnrealEditor-Engine.so!FTickTaskSequencer::ReleaseTickGroup(ETickingGroup, bool) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/Engine/Private/TickTaskManager.cpp:555]
libUnrealEditor-Engine.so!FTickTaskManager::RunTickGroup(ETickingGroup, bool) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/Engine/Private/TickTaskManager.cpp:1582]
libUnrealEditor-Engine.so!UWorld::Tick(ELevelTick, float) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/Engine/Private/LevelTick.cpp:1515]
libUnrealEditor-UnrealEd.so!UEditorEngine::Tick(float, bool) [/mnt/horde/++UE5/Sync/Engine/Source/./Editor/UnrealEd/Private/EditorEngine.cpp:1922]
libUnrealEditor-UnrealEd.so!UUnrealEdEngine::Tick(float, bool) [/mnt/horde/++UE5/Sync/Engine/Source/./Editor/UnrealEd/Private/UnrealEdEngine.cpp:528]
UnrealEditor!FEngineLoop::Tick() [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/Launch/Private/LaunchEngineLoop.cpp:5819]
UnrealEditor!GuardedMain(char16_t const*) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/Launch/Private/Launch.cpp:190]
libUnrealEditor-UnixCommonStartup.so!CommonUnixMain(int, char**, int (*)(char16_t const*), void (*)()) [/mnt/horde/++UE5/Sync/Engine/Source/./Runtime/Unix/UnixCommonStartup/Private/UnixCommonStartup.cpp:269]
libc.so.6!UnknownFunction(0x2384f)
libc.so.6!__libc_start_main(+0x89)
UnrealEditor!_start()

Unlike 5.2, in 5.3 I got more stability without crashes when setting up car animations, and decided to stay on this version, but I was wrong, now my blueprints seem to be corrupted (chaos component does not work).

CVMVSS · August 1, 2023, 11:23pm

UP

Astrotronic · August 2, 2023, 4:24pm

Hello YYDeem, Welcome to the Forums.

Thanks for using 5.3 preview. I tried adding the Vehicle Template to my existing blank 5.3 project. I enabled the Chaos Vehicles Plugin and the vehicles were working as expected. (It sounds like your vehicles have a lot more going on though)

If you can make the steps to reproduce this crash in a new project, please submit it as a bug report.

DangerousMindGms · February 28, 2024, 10:16pm

Im getting thebsame issue but only using blueprints. Out of nowhere my AI vehicle just stopped working. Did you manage to find a solution?

PsychicParrot · June 10, 2024, 12:47am

Same issue here. It was working one minute, then the engine crashed (with the same error as above) and it wiped out my vehicle completely. Restarting the engine doesn’t fix it, the Blueprint is corrupted after this error.

Problem is, I’ve no idea what caused it. I wonder if it’s the wheels (as they’re in an array, right?) … since this only started happening when I started accessing the wheels array through the component. Maybe a race condition with initialization of the wheels and vehicles on the engine side? I dunno.

Any solution would be welcome.