How to attach weapon to different mesh on replicated server

Development Programming & Scripting
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1

I have a first person game, and I want to attached the weapon to the third person mesh for all the client and the server, but when it’s locally controlled ( current player), I want to attach it to the firstperson mesh.

So the Weapon property, is replicated, I’ve added an onRep callback, it is executing it, it is executing the Code but the “detach” from third and Attach to first, isn’t working. Maybe I’m missing something.

I’m quite new.


void UCombatComponent::OnRep_EquippedWeapon()
{
	ClientEquippedWeaponOnMesh();
}

void UCombatComponent::ClientEquippedWeaponOnMesh() const
{
	if (EquippedWeapon && Character)
	{
		if (Character->IsLocallyControlled())
		{
			// Detach the weapon from any previous attachment
			EquippedWeapon->DetachFromActor(FDetachmentTransformRules::KeepWorldTransform);

			if (const USkeletalMeshSocket* HandSocket = Character->GetFirstPersonMesh()->GetSocketByName(EquippedWeapon->GetHandSocketName()))
			{
				HandSocket->AttachActor(EquippedWeapon, Character->GetFirstPersonMesh());
			}
		}
	}
}

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2

So If ever someone have the same issues, or is asking for the same question, I’ve finally went the weapon have 2 meshes. 1 for ThirdPerson, and 1 for FirstPerson. I then, attach the Firstperson one when is locally controlled ( just for optimization I guess).

Combat Component.cpp:


void UCombatComponent::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
	Super::GetLifetimeReplicatedProps(OutLifetimeProps);
	DOREPLIFETIME(UCombatComponent, EquippedWeapon);
}




void UCombatComponent::ClientEquippedWeaponOnMesh() const
{
	if (EquippedWeapon && Character)
	{
		if (Character->IsLocallyControlled())
		{
			if (const USkeletalMeshSocket* HandSocket = Character->GetFirstPersonMesh()->GetSocketByName(EquippedWeapon->GetHandSocketName()))
			{
				EquippedWeapon->AttachToComponent(Character->GetFirstPersonMesh(), FAttachmentTransformRules::SnapToTargetNotIncludingScale, EquippedWeapon->GetHandSocketName());
			}
		}
	}
}

void UCombatComponent::OnRep_EquippedWeapon()
{
	ClientEquippedWeaponOnMesh();
}


UFUNCTION()
void ClientEquippedWeaponOnMesh() const;

UFUNCTION()
void OnRep_EquippedWeapon();

UPROPERTY(ReplicatedUsing= OnRep_EquippedWeapon)
AWeapon* EquippedWeapon;



Weapon.h


UPROPERTY(VisibleAnywhere, Category = "Weapon Properties")
USkeletalMeshComponent* WeaponMesh;

UPROPERTY(VisibleAnywhere, Category = "Weapon Properties")
USkeletalMeshComponent* FirstPersonWeaponMesh;

UPROPERTY(VisibleAnywhere, Category = "Weapon Properties")
USkeletalMeshComponent* ThirdPersonWeaponMesh;


Weapon.cpp


    AWeapon::AWeapon()
    {
	   bReplicates = true;
	   InitializeWeaponMesh();
    }

    void AWeapon::InitializeWeaponMesh()
    {
	  WeaponMesh = CreateDefaultSubobject<USkeletalMeshComponent>(TEXT("WeaponMesh"));

	  FirstPersonWeaponMesh = CreateDefaultSubobject<USkeletalMeshComponent>(TEXT("FirstPersonWeaponMesh"));
	  FirstPersonWeaponMesh->SetupAttachment(RootComponent);
	  FirstPersonWeaponMesh->SetOnlyOwnerSee(true); // Only visible to owning player

	  ThirdPersonWeaponMesh = CreateDefaultSubobject<USkeletalMeshComponent>(TEXT("ThirdPersonWeaponMesh"));
	  ThirdPersonWeaponMesh->SetupAttachment(RootComponent);
	  ThirdPersonWeaponMesh->SetOwnerNoSee(true); // Not visible to owning player


	  FirstPersonWeaponMesh->SetSkeletalMesh(WeaponMesh->GetSkeletalMeshAsset());
	  ThirdPersonWeaponMesh->SetSkeletalMesh(WeaponMesh->GetSkeletalMeshAsset());

	  SetRootComponent(WeaponMesh);

	  WeaponMesh->SetCollisionResponseToAllChannels(ECR_Block);
	  WeaponMesh->SetCollisionResponseToChannel(ECC_Pawn, ECR_Ignore);
	  WeaponMesh->SetCollisionEnabled(ECollisionEnabled::NoCollision);
    }
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