Check the Test Project for an in-engine example
Adding the interface
For an actor to have a faction, we need to add a FactionAgentInterface. This will allow the system to set and get the current interface.
To add an interface we have to go into Class Settings
From here we click on Add, inside Interfaces and search for FactionAgentInterface
Getting and Settings the Faction
Factions require your actor to define how to get and set a faction. That can be done overriding GetFaction and SetFaction.
A common implementation would be to have a variable (of type "Faction"), and then return it with GetFaction and set it with SetFaction:
Factions in Controllers
Sometimes you may want a controller to share a faction with its controlled pawn or character.
This process is exactly the same as before, except that instead of getting and setting a variable, we will get and set the faction from our pawn.