[Unity6] 2D Behavior Tree 3( Chase, Attack )

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Chase, Attack 행동

1. Blackboard 거리 변수 추가
currentDistance : Target 과의 거리 체크
chaseDistance : chaseDistance에 들어오면 따라가기
attackDistance : attackDistance 안에 들어오면 Attack
fallOutDistance : fallOutDistance보다 멀어지면 Idle 상태, 순찰
 
2. 투사체, 무기 관련 작업
 
3. EnemyPrefab - Behavior Agent, weapon 설정하기

거리계산
새로운 On Start Node 생성(별도의 로직으로 처리)
UpdateDistance CurrentDistance를 갱신
Conditional Branch, Create New Condition로 조건(current, chaseDistance 비교)에 따라 IstargetDetected 변경
 

Chase

Target이 attackDistance보다 멀면 따라가기 / 가까우면 Attack 행동 Target이 fallOutDistance보다 멀어지면 Idle
 
Chase : Self Navigation To Target
 

Attack

현재 무기로 공격/ Target이 멀어지면 Idle
 
Weapon : Try Attack With currentWeapon
 

New Action Node

Chase Action : Self Navigate To Target
UpdateDistance Action : Update Self and Target CurrentDistance
Weapon Action : try attack with CurrentWeapon

Chase

Chase Action : agent의 속도, 이동 위치 설정

EnemyState

using System;
using Unity.Behavior;
using UnityEngine;
using Action = Unity.Behavior.Action;
using Unity.Properties;
using UnityEngine.AI;

[Serializable, GeneratePropertyBag]
[NodeDescription(name: "Chase", story: "[Self] Navigate To [Target]", category: "Action", id: "1b2920d167edfa9124c5af5b723e5a4d")]
public partial class ChaseAction : Action
{
    [SerializeReference] public BlackboardVariable<GameObject> Self;
    [SerializeReference] public BlackboardVariable<GameObject> Target;

    private NavMeshAgent agent;

    protected override Status OnStart()
    {
        agent = Self.Value.GetComponent<NavMeshAgent>();
        agent.speed = 5f;
        agent.SetDestination(Target.Value.transform.position);

        return Status.Running;
    }
}

UpdateDistance

UpdateDistance Action : CurrentDistance(target과 자신과의 거리)를 갱신

EnemyState

using System;
using Unity.Behavior;
using UnityEngine;
using Action = Unity.Behavior.Action;
using Unity.Properties;

[Serializable, GeneratePropertyBag]
[NodeDescription(name: "UpdateDistance", story: "Update [Self] and [Target] [CurrentDistance]", category: "Action", id: "4e20c120715722a8167532f3cb55152d")]
public partial class UpdateDistanceAction : Action
{
    [SerializeReference] public BlackboardVariable<GameObject> Self;
    [SerializeReference] public BlackboardVariable<GameObject> Target;
    [SerializeReference] public BlackboardVariable<float> CurrentDistance;

    protected override Status OnUpdate()
    {
        CurrentDistance.Value = Vector2.Distance(Self.Value.transform.position, Target.Value.transform.position);

        return Status.Success;
    }
}

Weapon

Weapon Action : 무기에 맞게 TryAttack() 실행

EnemyState

using System;
using Unity.Behavior;
using UnityEngine;
using Action = Unity.Behavior.Action;
using Unity.Properties;

[Serializable, GeneratePropertyBag]
[NodeDescription(name: "Weapon", story: "try attack with [CurrentWeapon]", category: "Action", id: "c4825c53b5e000692e69d1965c1a4f14")]
public partial class WeaponAction : Action
{
    [SerializeReference] public BlackboardVariable<WeaponBase> CurrentWeapon;

    protected override Status OnUpdate()
    {
        CurrentWeapon.Value.TryAttack();
        return Status.Success;
    }
}

이것저것 메모

Conditional Branch, Create New Condition

조건(True, false)에 따라 노드를 실행하는 조건 분기 노드
두 수 비교조건 Inspector - Assign Condition - Variable Comparison
Create New Action과 같이 Create New Condition으로 새로운 조건을 생성할 수 있다.
CheckTargetDetect : Compare values of CurrentDistance and ChaseDistance

CheckTargetDetectCondition

using System;
using Unity.Behavior;
using UnityEngine;

[Serializable, Unity.Properties.GeneratePropertyBag]
[Condition(name: "CheckTargetDetect", story: "Compare values of [CurrentDistance] and [ChaseDistance]", category: "Conditions", id: "d502e9fb2afcf10ac06045774d095dd5")]
public partial class CheckTargetDetectCondition : Condition
{
    [SerializeReference] public BlackboardVariable<float> CurrentDistance;
    [SerializeReference] public BlackboardVariable<float> ChaseDistance;

    
    public override bool IsTrue()
    {
        if (CurrentDistance.Value <= ChaseDistance.Value)
        {
            return true;
        }

        return false;
    }
}

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Behavior 마무리

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