Unreal Engine 5: Advanced Lobby System

Explore replication, rep notify callbacks, and multicasting in Unreal Engine 5, showing how variables replicate across server and client and trigger UI updates via server-to-client changes.

Learn how multicasting runs on the server to broadcast data to all connected clients and trigger shared effects, such as shooter sound effects, across every screen.

Explore ownership in Unreal networking, where each client’s player controller owns its actor and only the owner can execute related RPCs.

Create a client server list widget for Unreal Engine 5 lobby, with a vertical and horizontal box, showing ping, server name, and player count in the menu HUD.

Create a client server list entry widget using a blueprint, featuring server name, number of players, ping, a join button, and a bordered horizontal box layout.

Set up an Unreal Engine 5 lobby by creating a lobby game mode and lobby controller, assign them to level with no default pawn, and three cubes as spawn points.

Unreal Engine 5 lobby game mode to handle client login on the server, overriding beginplay, post login, and on logout, tracking platforms and connected players with events and macros.

this lecture shows how to create data tables and structs for an Unreal Engine 5 lobby system, including lobby character data and maps data.

Duplicate the BP third person, name it lobby character, and set the mesh color to light blue; then create three child classes with colors and fill the lobby data tables.

Create the lobby’s connected players widget for Unreal Engine 5, building a scrollable connected players list with a bordered, padded vertical container and dynamic entries.

Create and display the lobby menu widget on the owning client, adding it to the viewport after login. Clarify race conditions and replication settings guiding server versus client execution.

Replicate each player's info by using a current player info struct in the lobby controller and share an array of infos to update all clients about each player's ready status.

Explore server authoritative platform spawning and clearing of lobby characters in Unreal Engine 5, using spawn actor, chosen class, and replication to synchronize clients.

Learn to implement spawn character at platform in Unreal Engine 5 by looping through platforms to find an empty slot and spawn on a free platform with a chosen class.

Fix the spawn on the platform by adding the return node, enable simulate physics and gravity with pawn collision on the lobby character, and validate the spawn.