unity-netcode

Development

Unity Netcode for GameObjects skill for multiplayer networking, RPCs, state synchronization, and server-authoritative gameplay.

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How to use this skill

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Source SKILL.md: https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/game-development/skills/unity-netcode/SKILL.md

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Unity Netcode Skill

Multiplayer networking using Unity Netcode for GameObjects.

Overview

This skill provides capabilities for implementing multiplayer games using Unity's Netcode for GameObjects, including state synchronization, RPCs, and network topology configuration.

Capabilities

Network Architecture

Configure client-server topology
Set up network manager
Handle player spawning
Manage scene loading

State Synchronization

Implement NetworkVariables
Configure sync modes
Handle prediction
Manage network transforms

Remote Procedure Calls

Implement ServerRpc methods
Create ClientRpc methods
Handle RPC parameters
Manage RPC batching

Player Management

Handle player connections
Implement player spawning
Manage player state
Handle disconnections

Prerequisites

Unity 2021.3+
Netcode for GameObjects package
Transport layer (UTP recommended)

Usage Patterns

Network Object

public class PlayerNetworkBehaviour : NetworkBehaviour
{
    private NetworkVariable<int> health = new NetworkVariable<int>(100);

    public override void OnNetworkSpawn()
    {
        if (IsOwner)
        {
            // Initialize owned player
        }
    }

    [ServerRpc]
    public void TakeDamageServerRpc(int damage)
    {
        health.Value -= damage;
        if (health.Value <= 0)
        {
            DieClientRpc();
        }
    }

    [ClientRpc]
    private void DieClientRpc()
    {
        // Play death effects on all clients
    }
}

Network Manager Setup

// Configure in NetworkManager component
networkManager.ConnectionApprovalCallback = ApprovalCheck;

void ApprovalCheck(NetworkManager.ConnectionApprovalRequest request,
                   NetworkManager.ConnectionApprovalResponse response)
{
    response.Approved = ValidatePlayer(request.Payload);
    response.CreatePlayerObject = true;
}

Best Practices

Use NetworkVariables for state
Validate all RPCs on server
Minimize network traffic
Handle disconnections gracefully
Test with simulated latency

References

Netcode Documentation