Photon Unity Networking 2 (PUN2)

Multiplayer implementation for NWH Vehicle Physics 2 using Photon Unity Networking 2. Works for both dedicated server and host+client scenarios.

Prerequisites

  • Vehicle and scene must be set up for single-player first (see Quick Start)
  • PUN2 must be imported and configured (verify with Photon's demo scenes first)

Setup

Import Sample

Import the Multiplayer PUN2 Sample via Package Manager:

  1. Open Package Manager
  2. Select NWH Vehicle Physics 2
  3. Expand Samples section
  4. Import Multiplayer PUN2 Sample

Scene Setup

Create a PhotonManager GameObject with:

  • OnJoinedInstantiate component
  • ConnectAndJoinRandom component
  • Set position offset >10
  • Enable Auto Connect

Vehicle Setup

Add PhotonMultiplayerVehicle component to your vehicle. This automatically adds required components:

  • PhotonView
  • PhotonRigidbodyView
  • PhotonTransformView

Important: PhotonView's Observe option must NOT be set to "Off".

The component automatically configures ObservedComponents on initialization. Configurable properties:

  • Send Rate: Network send rate (default: 12)
  • Serialization Rate: State serialization rate (default: 12)

Instantiation

Place vehicle prefab in a Resources folder, then assign it to PhotonManager's OnJoinedInstantiate > Prefabs To Instantiate.

Press Play to test. For multiplayer testing, build the project and run two instances side by side.

How It Works

PhotonMultiplayerVehicle implements IPunObservable to synchronize:

  • Input states (steering, throttle, clutch, handbrake, gear shifts)
  • Light states
  • Engine angular velocity
  • Actions (horn, engine start/stop, cruise control, boost, flip over, trailer attach/detach)

The PhotonView owner simulates physics. Remote clients receive and apply the synchronized state.