[Unreal]#18_Custom Behavior Tree Task

 

[Unreal]#18_Custom Behavior Tree Task 

Unreal 개발 중 "Behavior Tree Task"에 대해 알아보겠습니다.

"Simple Shooter Game"의 AI Player 개발 내용입니다.

 

 

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BTTask_Shoot

1. BTTask_Shoot

 

2. UBTTask_Shoot.h

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "BehaviorTree/BTTaskNode.h"
#include "BTTask_Shoot.generated.h"

/**
 * 
 */
UCLASS()
class SIMPLESHOOTERNEW_API UBTTask_Shoot : public UBTTaskNode
{
	GENERATED_BODY()
	
public:
	// 1. 생성자
	UBTTask_Shoot();

protected:
	// 2. UBTTaskNode::Execute() 가상 함수 오버라이딩
	virtual EBTNodeResult::Type ExecuteTask(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory) override;

};

 

3. UBTTask_Shoot.cpp

// Fill out your copyright notice in the Description page of Project Settings.


#include "BTTask_Shoot.h"
#include "AIController.h"
#include "ShooterCharacter.h"

UBTTask_Shoot::UBTTask_Shoot()
{
    NodeName = "Shoot";
}

EBTNodeResult::Type UBTTask_Shoot::ExecuteTask(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory)
{
    Super::ExecuteTask(OwnerComp, NodeMemory);

    // 1. AIController 가져오기
    if(OwnerComp.GetAIOwner() == nullptr)
        return EBTNodeResult::Failed;
    
    // 2. APawn -> AShooterCharacter Casting
    AShooterCharacter* Character = Cast<AShooterCharacter>(OwnerComp.GetAIOwner()->GetPawn());
    if(Character == nullptr)
        return EBTNodeResult::Failed;
    else
        Character->Shoot();

    return EBTNodeResult::Succeeded;
}

1. 생성자 : 노드 네임 설정
2. GetAIOwner() : AAIController 유형의 AI를 소유하는 AI Controller를 반환합니다.
3. GetPawn() : AIController의 함수가 아니라, AIController가 상속하는 AController의 함수입니다!
4. AShooterCharacter::Shoot() : 범위 지정자가 꼭 "public"인지 확인해야 합니다!

 

Behavior Tree

1. BTTask_Shoot 추가

 

2. 테스트