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UMaterialInstanceDynamic::SetTextureParameterValue generate crash in the render thread

Hello, I was trying to make some cool shader stuff and then I ran into a huge problem: in my Character::tick if I call PostProcessColoration->SetTextureParameterValue("ColorationData0", mapPlane->getRenderTarget()); I get a beautiful crash with this callstack:

  SEGV_MAPERR at 0x3
 FGenericPlatformMisc::RaiseException(unsigned int) Address = 0x10b92e85b (filename not found) [in UE4Editor-Core.dylib]
 FOutputDeviceMacError::Serialize(wchar_t const*, ELogVerbosity::Type, FName const&) Address = 0x10baeb7c2 (filename not found) [in UE4Editor-Core.dylib]
 FOutputDevice::Logf(wchar_t const*, ...) Address = 0x10bb67207 (filename not found) [in UE4Editor-Core.dylib]
 FDebug::AssertFailed(char const*, char const*, int, wchar_t const*, ...) Address = 0x10bb6295b (filename not found) [in UE4Editor-Core.dylib]
 FUniformExpressionSet::CreateUniformBuffer(FMaterialRenderContext const&, FRHICommandList*, FLocalUniformBuffer*) const Address = 0x10e1c6a4a (filename not found) [in UE4Editor-Engine.dylib]
 FMaterialRenderProxy::EvaluateUniformExpressions(FUniformExpressionCache&, FMaterialRenderContext const&, FRHICommandList*) const Address = 0x10e1c50f4 (filename not found) [in UE4Editor-Engine.dylib]
 FMaterialRenderProxy::CacheUniformExpressions() Address = 0x10e1c790a (filename not found) [in UE4Editor-Engine.dylib]
 TGraphTask<FMaterialRenderProxy::CacheUniformExpressions_GameThread()::EURCMacro_FCacheUniformExpressionsCommand>::ExecuteTask(TArray<FBaseGraphTask*, FDefaultAllocator>&, ENamedThreads::Type) Address = 0x10e254ad0 (filename not found) [in UE4Editor-Engine.dylib]
 FNamedTaskThread::ProcessTasksNamedThread(int, bool) Address = 0x10b964f91 (filename not found) [in UE4Editor-Core.dylib]
 FNamedTaskThread::ProcessTasksUntilQuit(int) Address = 0x10b960a35 (filename not found) [in UE4Editor-Core.dylib]
 FTaskGraphImplementation::ProcessThreadUntilRequestReturn(ENamedThreads::Type) Address = 0x10b95d2d1 (filename not found) [in UE4Editor-Core.dylib]
 RenderingThreadMain(FEvent*) Address = 0x112723364 (filename not found) [in UE4Editor-RenderCore.dylib]
 FRenderingThread::Run() Address = 0x112735787 (filename not found) [in UE4Editor-RenderCore.dylib]
 FRunnableThreadPThread::Run() Address = 0x10b9ae948 (filename not found) [in UE4Editor-Core.dylib]
 FRunnableThreadPThread::_ThreadProc(void*) Address = 0x10b978661 (filename not found) [in UE4Editor-Core.dylib]
 _pthread_body Address = 0x7fff8e9b1aab (filename not found) [in libsystem_pthread.dylib]
 _pthread_body Address = 0x7fff8e9b19f7 (filename not found) [in libsystem_pthread.dylib]
 thread_start Address = 0x7fff8e9b11fd (filename not found) [in libsystem_pthread.dylib]

As you can see my code does not appear in this log it's only from the engine. my "PostProcessColoration" object is okay I can call: "PostProcessColoration->SetVectorParameterValue" without any problem. It's specific to the "SetTextureParameterValue" call. My mapPlane is not NULL. I get it using "UGameplayStatics::GetAllActorsOfClass" and it looks like this:

     AColourPlaneActor::AColourPlaneActor() {
         renderTarget = CreateDefaultSubobject<UTextureRenderTarget2D>(TEXT("RT"));
         renderTarget->InitAutoFormat(1024, 1024);
         renderTarget->OverrideFormat = EPixelFormat::PF_FloatRGB;
         renderTarget->ClearColor = FLinearColor( 1.f, 0.f, 0.f, 0.f );
         renderTarget->bNeedsTwoCopies = false;
         renderTarget->AddressX = TA_Wrap;
         renderTarget->AddressY = TA_Wrap;
         renderTarget->ClearColor = FLinearColor::Black;
     UTextureRenderTarget2D* AColourPlaneActor::getRenderTarget() {
         return renderTarget;
 class HANA_API AColourPlaneActor : public AStaticMeshActor
     UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category=debug) UTextureRenderTarget2D* renderTarget;
     UTextureRenderTarget2D* getRenderTarget();

I can see my renderTarget in the Editor without any problem. I’m confused: my material is ok, my texture is ok and the crash does not appear in my code. Is this a bug from the engine or from me ? I'm on OSX using a MBP 2015 with an AMD R9370X. thank you for your help. PS: updating in 4.14 does not help...

Product Version: UE 4.14
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asked Nov 14 '16 at 04:11 PM in C++ Programming

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