Tutorial: Mutable Tutorials

GerardMTE · November 19, 2024, 5:35pm

Home page for Mutable tutorials.

https://dev.epicgames.com/community/learning/tutorials/yjw9/unreal-engine-mutable-tutorials

TechLord · December 4, 2024, 2:28am

Awesome. A Game Changer!

YouTube

Lance3D · December 29, 2024, 5:25am

Love the mutable plugin! I have a question about it, would you mind to take a look?
https://forums.unrealengine.com/t/mutable-can-i-dynamically-add-sub-object-to-customizable-object-and-recompile-it/2248348

ScottDunbar.io · January 15, 2025, 11:02pm

hello. i crashing when i try to open this sample project. i’m on unreal engine 5.5.1


Assertion failed: Version == 23 [File:D:\build\++UE5\Sync\Engine\Plugins\Mutable\Source\MutableRuntime\Private\MuR\Mesh.cpp] [Line: 1044] 



UnrealEditor_MutableRuntime!mu::Mesh::Unserialise() [D:\build\++UE5\Sync\Engine\Plugins\Mutable\Source\MutableRuntime\Private\MuR\Mesh.cpp:1044]
UnrealEditor_MutableRuntime!mu::Mesh::StaticUnserialise() [D:\build\++UE5\Sync\Engine\Plugins\Mutable\Source\MutableRuntime\Private\MuR\Mesh.cpp:35]
UnrealEditor_MutableRuntime!mu::CodeRunner::FLoadMeshRomTask::Complete() [D:\build\++UE5\Sync\Engine\Plugins\Mutable\Source\MutableRuntime\Private\MuR\CodeRunnerTasked.cpp:2196]
UnrealEditor_MutableRuntime!mu::CodeRunner::Run() [D:\build\++UE5\Sync\Engine\Plugins\Mutable\Source\MutableRuntime\Private\MuR\CodeRunnerTasked.cpp:336]
UnrealEditor_MutableRuntime!mu::CodeRunner::StartRun() [D:\build\++UE5\Sync\Engine\Plugins\Mutable\Source\MutableRuntime\Private\MuR\CodeRunnerTasked.cpp:284]
UnrealEditor_MutableRuntime!mu::System::GetMesh() [D:\build\++UE5\Sync\Engine\Plugins\Mutable\Source\MutableRuntime\Private\MuR\System.cpp:594]
UnrealEditor_CustomizableObject!impl::Task_Mutable_GetMeshes_GetMesh_Loop() [D:\build\++UE5\Sync\Engine\Plugins\Mutable\Source\CustomizableObject\Private\MuCO\CustomizableObjectSystem.cpp:2447]
UnrealEditor_CustomizableObject!impl::Impl::Task_Mutable_GetMeshes() [D:\build\++UE5\Sync\Engine\Plugins\Mutable\Source\CustomizableObject\Private\MuCO\CustomizableObjectSystem.cpp:2552]
UnrealEditor_CustomizableObject!UE::Tasks::Private::TExecutableTaskBase<TUniqueFunction<void __cdecl(void)>,void,void>::ExecuteTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Tasks\TaskPrivate.h:873]
UnrealEditor_CustomizableObject!UE::Tasks::Private::FTaskBase::TryExecuteTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Tasks\TaskPrivate.h:504]
UnrealEditor_CustomizableObject!LowLevelTasks::TTaskDelegate<LowLevelTasks::FTask * __ptr64 __cdecl(bool),48>::TTaskDelegateImpl<`LowLevelTasks::FTask::Init<`UE::Tasks::Private::FTaskBase::Init'::`2'::<lambda_1> >'::`13'::<lambda_1>,0>::CallAndMove() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\TaskDelegate.h:171]
UnrealEditor_Core!LowLevelTasks::FTask::ExecuteTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\Task.h:627]
UnrealEditor_Core!LowLevelTasks::FScheduler::ExecuteTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:267]
UnrealEditor_Core!LowLevelTasks::FScheduler::WorkerLoop() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:514]
UnrealEditor_Core!`LowLevelTasks::FScheduler::CreateWorker'::`2'::<lambda_1>::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:75]
UnrealEditor_Core!FThreadImpl::Run() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\HAL\Thread.cpp:69]
UnrealEditor_Core!FRunnableThreadWin::Run() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:159]

Ben_Cykyria · January 23, 2025, 10:04am

I can not download the sample project anymore?

Can anyone please check this?

M4ttr1xST · January 23, 2025, 10:43am

Hey @Ben_Cykyria just removed local content and did a fresh download and created a new project in UE 5.5.1 and it works seamlessly. Maybe it has been a temporary download error?

Ben_Cykyria · January 23, 2025, 2:32pm

@M4ttr1xST Thanks! I tried again right now (restarted PC too) and I still get that error.
Seems like it’s some issue with the CDN then, I’ll wait until tomorrow and open a ticket if it still doesn’t work.

mrfly520 · March 15, 2025, 7:29pm

so，what the pins list come from?hard code?

Ben_Cykyria · March 16, 2025, 11:54am

You can “Export to pin” and reuse that value later anywhere in the graph with “Import pin…”

An example use case I have in my graph is skin tone. I read the value once and export it, then reuse it multiple times in the graph to adjust texture colors.

zeroInstance · March 17, 2025, 9:39pm

Does post process animation blueprint work with mutable? After adding customizableSkeletal it just turns off, also there is no post process in the project from epics at all

Ben_Cykyria · June 20, 2025, 11:52am

(Issue solved by recreating the IKRetargeter asset from scratch. Not a mutable bug.)

Ben_Cykyria · July 1, 2025, 4:04pm

@GerardMTE
Mutable is a real beast thanks for making this!

I’m testing Mutable Population in 5.6 and it works a lot better than in 5.5. It’s really amazing.

I encounter an error while cooking. It happens when a CustomizableObjectPopulation asset is referenced in a blueprint:

UATHelper: Cooking (Windows): LogWindows: Error: appError called: Assertion failed: ClassWeights[i].Class->CustomizableObject->IsCompiled() [File:D:\build\++UE5\Sync\Engine\Plugins\Experimental\MutablePopulation\Source\CustomizableObjectPopulation\Private\MuCOP\CustomizableObjectPopulation.cpp] [Line: 95]
UATHelper: Cooking (Windows): LogWindows: Error: begin: stack for UAT
UATHelper: Cooking (Windows): LogWindows: Error: === Critical error: ===
UATHelper: Cooking (Windows): LogWindows: Error:
UATHelper: Cooking (Windows): LogWindows: Error: Assertion failed: ClassWeights[i].Class->CustomizableObject->IsCompiled() [File:D:\build\++UE5\Sync\Engine\Plugins\Experimental\MutablePopulation\Source\CustomizableObjectPopulation\Private\MuCOP\CustomizableObjectPopulation.cpp] [Line: 95]
UATHelper: Cooking (Windows): LogWindows: Error:
UATHelper: Cooking (Windows): LogWindows: Error:
UATHelper: Cooking (Windows): LogWindows: Error:
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffc9aa04018 UnrealEditor-Core.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x0000026f08900608 UnrealEditor-CustomizableObjectPopulation.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffc92202cfd UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffc921c6c81 UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffc921f7fae UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffc921f779d UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffc921fc4f4 UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffc9220ba24 UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffc9220b1ac UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffc90e79940 UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffc90e3a69a UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffc90e56c83 UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ff6173c8fa0 UnrealEditor-Cmd.exe!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ff6173be39c UnrealEditor-Cmd.exe!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ff6173be6ba UnrealEditor-Cmd.exe!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ff6173c209e UnrealEditor-Cmd.exe!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ff6173d4e44 UnrealEditor-Cmd.exe!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ff6173d7466 UnrealEditor-Cmd.exe!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd3418e8d7 KERNEL32.DLL!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error:
UATHelper: Cooking (Windows): LogWindows: Error: end: stack for UAT
PackagingResults: Error: appError called: Assertion failed: ClassWeights[i].Class->CustomizableObject->IsCompiled() [File:D:\build\++UE5\Sync\Engine\Plugins\Experimental\MutablePopulation\Source\CustomizableObjectPopulation\Private\MuCOP\CustomizableObjectPopulation.cpp] [Line: 95]
PackagingResults: Error: begin: stack for UAT
PackagingResults: Error: === Critical error: ===
PackagingResults: Error: Assertion failed: ClassWeights[i].Class->CustomizableObject->IsCompiled() [File:D:\build\++UE5\Sync\Engine\Plugins\Experimental\MutablePopulation\Source\CustomizableObjectPopulation\Private\MuCOP\CustomizableObjectPopulation.cpp] [Line: 95]
PackagingResults: Error: [Callstack] 0x00007ffc9aa04018 UnrealEditor-Core.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x0000026f08900608 UnrealEditor-CustomizableObjectPopulation.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffc92202cfd UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffc921c6c81 UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffc921f7fae UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffc921f779d UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffc921fc4f4 UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffc9220ba24 UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffc9220b1ac UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffc90e79940 UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffc90e3a69a UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffc90e56c83 UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff6173c8fa0 UnrealEditor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff6173be39c UnrealEditor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff6173be6ba UnrealEditor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff6173c209e UnrealEditor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff6173d4e44 UnrealEditor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff6173d7466 UnrealEditor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffd3418e8d7 KERNEL32.DLL!UnknownFunction []
PackagingResults: Error: end: stack for UAT
UATHelper: Cooking (Windows): Took 9,49s to run UnrealEditor-Cmd.exe, ExitCode=3
UATHelper: Cooking (Windows): Cook failed.

The setup is basically this (if the variable is not set, the error does not occur):