FastArrayReplication size limitation

Development Programming & Scripting C++
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1

Hey there.

So I have the problem, that I have a big amount of data, potentially a few hundred MBs (Mesh Data), that are loaded/generated at runtime and need to be replicated to every Player.
In the past, I was using RPCs to split the Data into Chunks and send them one by one, but this solution was very hacky and I was dissatisfied with it. So now I opted to use FastArrayReplication.

Here are some code exepts:

USTRUCT()
struct FFastVector : public FFastArraySerializerItem {
	GENERATED_BODY()

	FFastVector() = default;
	FFastVector(const FVector Vector) : Vector(Vector) {};
	
	UPROPERTY()
	FVector Vector;
};

USTRUCT()
struct FFastArrayVector: public FFastArraySerializer {
	GENERATED_BODY()
	
	UPROPERTY()
	TArray<FFastVector> Items;
	
	bool NetDeltaSerialize(FNetDeltaSerializeInfo & DeltaParams) {
		return FastArrayDeltaSerialize<FFastVector, FFastArrayVector>(Items, DeltaParams, *this);
	}
}

template<>
struct TStructOpsTypeTraits<FFastArrayVector> : TStructOpsTypeTraitsBase2<FFastArrayVector> {
	enum {
		WithNetDeltaSerializer = true,
	};
};

------------------------------------------------------

class AMyActor : public AActor {
	GENERATED_BODY()

	UPROPERTY(Replicated)
	FFastArrayVector ReplicatedVectors;

public:
	virtual void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override {
		Super::GetLifetimeReplicatedProps(OutLifetimeProps);
		DOREPLIFETIME(AMyActor, ReplicatedVectors)
	}

	...
}

The Vertices are filled similar to this:

void AMyActor::FillReplicatingData(const TArray<FVector>& Vertices) {
	for (const auto& Vertex : Vertices) {
		const int32 Position = ReplicatedVectors.Items.Add(Vertex);
		ReplicatedVectors.MarkItemDirty(ReplicatedVectors.Items[Position]);
	}

I original understood that this Method of Replication does not have a size limitation and can be used to send large amounts of data, yet, if you take a look at the log you see this and there is no actual data received on the client:

LogNetFastTArray: Warning: NumChanged > GetMaxNumberOfAllowedChangesPerUpdate: 41180 > 2048. (Write)
LogNetFastTArray: Warning: NumChanged > GetMaxNumberOfAllowedChangesPerUpdate: 196599 > 2048. (Write)
LogNetFastTArray: Warning: NumChanged > GetMaxNumberOfAllowedChangesPerUpdate: 41180 > 2048. (Write)
LogNetFastTArray: Warning: NumChanged > GetMaxNumberOfAllowedChangesPerUpdate: 41180 > 2048. (Write)
LogNetPartialBunch: Error: Attempted to send bunch exceeding max allowed size. BunchSize=4065126, MaximumSize=65536

So am I missing something? Or is this method also limited to 64K-Bytes? And if so, is there any way to send this much data to another user (including using Plugins/Libraries, Marketplace or not)

Thanks in advance!