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60 lines
2.7 KiB
Markdown
60 lines
2.7 KiB
Markdown
# Pong
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A simple example for "How to built a multiplayer game with Mirror" is Pong,
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which is included in the AssetStore package of Mirror. It illustrates the usage
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of NetworkManager, NetworkManagerHUD, NetworkBehaviour, NetworkIdentity,
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NetworkTransform, NetworkStartPosition and NetworkingAttributes.
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## Setting the number of players
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First of all, let's have a look at the NetworkManager object in the main scene.
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When adding the NetworkManager component to a gameobject, a few default settings
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are already set (**Don't destroy on Load**, **Run in Background**, ...) For
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playing Pong the maximum number of players is 2, so the setting **Network
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Info/Max connections** will also be 2. As there are no other scenes (lobby,
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online or offline scene) in this sample the properties for **Offline Scene** and
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**Online Scene** will stay empty.
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## Creating the player
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Furthermore every player needs a racket to play with. Each player who joins the
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game will have his own controllable object, which represents him within the
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game. This gameobject is called *PlayerObject*. For spawning the *PlayerObject*
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a prefab has to be created, containing at least a NetworkIdentity component with
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**Local Player Authority** checked. The **Local Player Authority** allows the
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player to control and modify the gameobjects properties (e.g. for movement). The
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NetworkManager needs a reference to this prefab, which is located in **Spawn
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Info/Player Prefab**. To have the player movement synchronized over the network,
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the player prefab also contains a NetworkTransform.
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## Player start position
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The main scene contains 2 gameobjects with only a NetworkStartPosition component
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(gameobjects RacketSpawnLeft, RacketSpawnRight in the scene). These transforms
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will be automatically registered by the NetworkManager as spawning positions.
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## Setting up the network
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A very convenient component for establish/testing connections is the
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NetworkManagerHUD. It provides basic functionality for start a game as LAN
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client, LAN server or host (LAN client and LAN server at the same time). It
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requires the NetworkManager component.
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## The ball of Pong
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The ball is the main focus of Pong, as this is the object needed to score
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points. Its NetworkIdentity component has neither **Server Only** nor **Local
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Player Authority** checked, as it's moved by the server physics engine and can
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be influenced by the players. As with the *PlayerObject* the position is
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synchronized via NetworkTransform. When having multiple scenes, the ball can be
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spawned by the NetworkManager, but to keep this sample simple, it's placed
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directly within the main scene.
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