Duplicated UStaticMeshComponent doesn't replicate to clients.

Development Programming & Scripting
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1

I have a function in my actor that dynamically creates new static mesh component (a Wall Mesh) next to my InitialWallMesh. Function i use is this:

void ABuildableWall::AppendWall(int32 WallIndex, ERelativeDirection RelativeDirection)
{
	// Make sure we are on server
	if(!HasAuthority())
	{
		UE_LOG(LogSecurity, Warning, TEXT("Can't append wall on client! Only called on server!"))
		return;
	}

	if(RelativeDirection == ERelativeDirection::None)
		return;
	
	UStaticMeshComponent* Wall = GetWallByIndex(WallIndex);
	if(!IsValid(Wall))
		return;

	// Get offsets
	FVector LocationOffset{};
	FRotator RotationOffset{};
	GetLocalOffsetsByDirection(RelativeDirection, LocationOffset, RotationOffset);

	// Convert to world space from component space
	FTransform Transform = Wall->GetComponentTransform();
	FVector SpawnLocation = Transform.TransformPosition(LocationOffset);
	FRotator SpawnRotation = Transform.TransformRotation(RotationOffset.Quaternion()).Rotator();

	// @TODO: Why replication doesn't work with DuplicateObject? Maybe some flags needs to be set or something...
	UStaticMeshComponent* NewWall = DuplicateObject(InitialWallMesh, this, *FString("Wall Mesh").Append(FString::FromInt(Walls.Num())));
	//UStaticMeshComponent* NewWall = NewObject<UStaticMeshComponent>(this, UStaticMeshComponent::StaticClass(), *FString("Wall Mesh").Append(FString::FromInt(Walls.Num())));
	//UStaticMeshComponent* NewWall = Cast<UStaticMeshComponent>(StaticDuplicateObject(InitialWallMesh, this, *FString("Wall Mesh").Append(FString::FromInt(Walls.Num())), RF_AllFlags & ~RF_Transient));

	// Attach and set transform
	NewWall->AttachToComponent(RootComponent, FAttachmentTransformRules::KeepWorldTransform);
	NewWall->SetWorldLocation(SpawnLocation);
	NewWall->SetWorldRotation(SpawnRotation);

	// Copy properties (for NewObject)
	NewWall->SetIsReplicated(InitialWallMesh->GetIsReplicated());
	NewWall->SetStaticMesh(InitialWallMesh->GetStaticMesh());
	
	// Copy Collisions (for NewObject)
	NewWall->SetCollisionProfileName(InitialWallMesh->GetCollisionProfileName());
	NewWall->SetCollisionEnabled(InitialWallMesh->GetCollisionEnabled());
	NewWall->SetCollisionResponseToChannels(InitialWallMesh->GetCollisionResponseToChannels());
	NewWall->SetNotifyRigidBodyCollision(InitialWallMesh->GetBodyInstance()->bNotifyRigidBodyCollision);
	NewWall->SetGenerateOverlapEvents(InitialWallMesh->GetGenerateOverlapEvents());
	
	NewWall->RegisterComponent();
	Walls.Add(NewWall);
	AddInstanceComponent(NewWall);

	// Add new wall as replicating subobject
	AddReplicatedSubObject(NewWall, COND_None);
}

So the problem is when i use DuplicateObject or StaticDuplicateObject component spawns only on server and never replicates to clients. Everything is ok if i use NewObject, but then i need to copy all the properties myself. What am i doing wrong here?

2

If i use NewObject’s funciton UObject* Template parameter like so:

FString NewWallName = FString("Wall Mesh").Append(FString::FromInt(Walls.Num()));
UStaticMeshComponent* NewWall = NewObject<UStaticMeshComponent>(
	this,
	InitialWallMesh->GetClass(),
	*NewWallName,
	RF_NoFlags,
	InitialWallMesh);

everything works fine, except now i have different materials when newly created component get’s replicated to client (picture). the stange thing is that an initial static mesh component that is default subobject replicates fine and it’s material replicates correcrly. ones that i create dynamically doesn’t.

image
image1920×1080 143 KB