Unreal Networking

Unreal Networking Skill

Multiplayer networking for Unreal Engine.

Overview

This skill provides capabilities for implementing multiplayer games using Unreal's built-in networking system.

Capabilities

Replication

• Configure replicated properties
• Handle replication conditions
• Manage replication priorities
• Implement custom replication

Remote Procedure Calls

• Implement Server RPCs
• Create Client RPCs
• Handle Multicast RPCs
• Manage RPC reliability

Authority and Relevancy

• Handle server authority
• Configure network relevancy
• Manage actor ownership
• Implement client prediction

Dedicated Servers

• Build dedicated server targets
• Handle headless mode
• Manage server performance
• Implement session management

Prerequisites

• Unreal Engine 5.0+
• Network knowledge

Usage Patterns

Replicated Property

UPROPERTY(ReplicatedUsing=OnRep_Health)
float Health;

UFUNCTION()
void OnRep_Health()
{
    // Called on clients when Health changes
    UpdateHealthUI();
}

void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    DOREPLIFETIME(AMyCharacter, Health);
}

RPC Implementation

UFUNCTION(Server, Reliable, WithValidation)
void Server_Fire(FVector Location, FRotator Rotation);

bool Server_Fire_Validate(FVector Location, FRotator Rotation)
{
    return true; // Add validation
}

void Server_Fire_Implementation(FVector Location, FRotator Rotation)
{
    // Execute on server
}

Best Practices

1. Validate all server RPCs
2. Minimize replicated properties
3. Use relevancy wisely
4. Test with simulated lag
5. Profile network bandwidth

References

• Networking Documentation