Hi Neongho
I remember, in UDK we only had pre-made UT classes, pathfinder, a very basic linetrace, booleans, delay, move to actor and random movement nodes to managing a very basic AI. And Pylons/Navmesh for crowd animation and more free bot movements, it was pretty efficient
Now we have much more advanced AI, with behavior tree, state machine and advanced coding via blueprint and aningraph.
But as someone very nostalgic, I’d like to see in Unreal 4 editor a dynamic pathfinder like a Kynapse AI created by one guy in early 2007:
