Unity 3D Local Multiplayer: Dynamic Controller Input Mapping and Split-Screen

Setting up couch co-op games in Unity 3D where families or friends can jump in with a mix of gamepads and keyboards can be surprisingly tricky with the older Input Manager.

Migrating to Unity's new Input System package makes handling multi-device assignment, dynamic player joining, and split-screen viewport rect calculations much cleaner.

Are you sticking with Unity for local multiplayer projects, or have you explored Godot or custom engines for indie local co-op titles?