• Designed meelee and ranged NPCs to fight the player
• NPCs can be given a patrol path that they will guard
• NPCs will investigate noises they hear or enemies they see
• If an NPCs health gets too low they will flee combat and break line of sight in order to heal

Behavior Trees:

• Meelee NPC with strafe around the player and attack in intervals

Action Game: Melee AI EQS

• Ranged NPC will find a suitable position and shoot at the player then reposition

Action Game: Ranged AI EQS

Sub-Trees:

• Used to switch between different states in the behavior tree

Tasks & Enviromental Queries:

• Moves the enemy along the patrol route

Action Game: AI Patrol

• Uses a query to find positions out of the player’s line of sight to hide at

• Uses a query in line of sight to the player, preferrably farther away, and repositions to a nearby point

• Uses a query around the player to find a good position to attack from

Enemy Blueprints:

• Creates the basic health bar widget and die/hit react functionality for all enemies

• The melee enemy attacks in a sphere trace in front of itself

• The ranged enemy attacks in a line trace from itself to the player

AI Controller:

• Initializes all enemies and defaults their state to passive
• Creates the perception for each enemy: sight, sound, & damage

Action Game: AI Perception

Blackboard:

• The basic blackboard for all enemies
• Uses the attack target to reference who they are fighting, the player or another npc
• The state keeps what current state the enemy is in
• Point of interest is if the enemy hears the player or sees the player for a moment and wants to investigate
• Attack radius is how much range the enemy has to make an attack
• Defend radius is how much range the enemy wants to keep between itself and the player

Blueprint Interfaces & Damage Struct:

• Interfaces used to define functions for melee and ranged seperately

• Structure used to store different types of damage and modifiers, like blockable or uninterruptable

Action Game: Damage System