Unreal NetMode&NetRole 解析

Version: Unreal 4.26
问题

  • 为啥UE编辑器会有EPlayNetMode有三种让你选择 。
  • 为啥描述World 的ENetMode 会有4种,而不只是(Client/Server 2种) 。
  • 为何Actor 会有Role的概念 。
EPlayNetModeUENUM()enum EPlayNetMode{ /** A non-networked game will be started. This can be used in combination with bLaunchSeparateServer to test menu -> server flow in your game. */ PIE_Standalone UMETA(DisplayName="Play Offline"), /** The editor will act as both a Server and a Client. Additional instances may be opened beyond that depending on the number of clients. */ PIE_ListenServer UMETA(DisplayName="Play As Listen Server"), /** The editor will act as a Client. A server will be started for you behind the scenes to connect to. */ PIE_Client UMETA(DisplayName="Play As Client"),};
  • PIE_Standalone
    单机玩法,本地直接有一个所谓的服务器和一个或多个玩家 。因此尤其注意相关网络请求rpc,值复制等都是同步执行的 。
    应用:一般游戏的训练场啊,游戏大厅,新手引导关卡 。不需要跟其他玩家交互的场景 。
  • PIE_Client
    一般用于多人在线联网战斗局内,比如吃鸡游戏那种开房间成功后进入局内战斗,就是所谓的战斗局内,用这个比较多 。
    应用:比如吃鸡游戏的战斗场景(与其他联网玩家战斗交互) 。
  • PIE_ListenServer
    一般用于开发局域网游戏 。
    应用:无(我没用过,现在好像没有开发局域网游戏的了吧) 。
综上:就是方便为了给UE 编辑器用户开发测试使用 。ENetMode //* The network mode the game is currently running.*/enum ENetMode{ /** Standalone: a game without networking, with one or more local players. Still considered a server because it has all server functionality. */ NM_Standalone, /** Dedicated server: server with no local players. */ NM_DedicatedServer, /** Listen server: a server that also has a local player who is hosting the game, available to other players on the network. */ NM_ListenServer, /*** Network client: client connected to a remote server.* Note that every mode less than this value is a kind of server, so checking NetMode < NM_Client is always some variety of server.*/ NM_Client,};
  • NM_Standalone
    如果你开启的是PIE_Standalone,所谓的客户端和服务器的World()->GetNetMode()都会只是NM_Standalone.
  • NM_DedicatedServer
    如果你开启的是PIE_Client,服务器上的World()->GetNetMode()才会是NM_DedicatedServer.
  • NM_Client
    如果你开启的是PIE_Client,客户端上的World()->GetNetMode()才会是NM_Client.
  • NM_ListenServer
    如果你开启的是PIE_Standalone,所谓的客户端和服务器的World()->NetMode 都会只是PIE_Standalone.
ENetRoleclass ENGINE_API AActor : public UObject{ /** Describes how much control the local machine has over the actor. */ UPROPERTY(Replicated) TEnumAsByte<enum ENetRole> Role; /** Returns how much control the remote machine has over this actor. */ UPROPERTY(Replicated, Transient) TEnumAsByte<enum ENetRole> RemoteRole;}/** The network role of an actor on a local/remote network context */enum ENetRole{ /** No role at all. */ ROLE_None, /** Locally simulated proxy of this actor. */ ROLE_SimulatedProxy, /** Locally autonomous proxy of this actor. */ ROLE_AutonomousProxy, /** Authoritative control over the actor. */ ROLE_Authority,};前面的ENetMode针对的是世界才能调用的,这个ENetRole是Actor才能调用的 。你需要了解Actor是作为UE 可以同步的最小单元 。主要是Actor的Role和RemoteRole,大概描述的是这个Actor本地的控制性和远端的控制性 。还有一点需要申明,只能是服务器复制Actor到客户端,客户端不会复制Actor到服务器 。
服务器创建Actor

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