Set Actor Enable Collision not replicated

Development Programming & Scripting
21

Another workaround would be to Set Collision Profile Name

https://i.imgur.com/gdgAhEs.png

22

Since we now know this is intended behaviour of component, most simple workaround would be to create a OnRep function.

This is my setup for now:

MyClass.h

UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Building)
class UBoxComponent *CollisionVolume;

UPROPERTY(ReplicatedUsing = OnRep_Collision)
bool collision;
    
UFUNCTION()
void OnRep_Collision();

virtual void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override;

MyClass.cpp

AMyClass::AMyClass(){
bReplicates = true;

CollisionVolume = CreateDefaultSubobject<UBoxComponent>(TEXT("CollisionVolume1"));
CollisionVolume->SetupAttachment(RootComponent);
CollisionVolume->SetCollisionProfileName(UCollisionProfile::NoCollision_ProfileName);
CollisionVolume->SetIsReplicated(true);

collision = false;
}


void AMyClass::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
	Super::GetLifetimeReplicatedProps(OutLifetimeProps);

	DOREPLIFETIME(ABuildable,collision);
}

//called on server from client outside class - look up server RPC
void AMyClass::Place(){
CollisionVolume->SetCollisionProfileName(UCollisionProfile::BlockAll_ProfileName);
collision = true;
}

void AMyClass::OnRep_Collision() {
	if (collision) {
		CollisionVolume->SetCollisionProfileName(UCollisionProfile::BlockAll_ProfileName);
	}
}

Of course if you have any sort of effects associated with this, you would execute them on a multicast. Creating a Enum type for collision also works, but for my personal use I do not need it.

For those who want to check out a further explanation of why this works, check out example map or tutorial from Reuben Ward at Learn Unreal Engine Networking in 30 Minutes - YouTube .