[UE] Line Trace, Multi Trace, TPS 기본 세팅

 

 

 

목차

 
 

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Line Trace

 

01_Spawn
	C01_Properties.h .cpp C02_Mesh C02_Mesh_Sphere C02_Mesh_Cone C03_Spawner.h .cpp
02_Profiler
	C01_Log.h .cpp C02_DrawDebug.h .cpp
03_Collision
	C01_ActorOverlap.h .cpp C02_ComponentOverlap.h .cpp C03_OverlapAndHit.h .cpp  C04_Trigger.h .cpp C04_Light.h .cpp  C05_MultiTrigger.h .cpp  C05_FallingBox.h .cpp  C05_SpotLight.h .cpp  C06_EventTrigger.h .cpp  C06_Explosion.h .cpp  C07_Override.h .cpp
04_Trace
	C01_Trigger.h .cpp  C01_SphereTrace.h .cpp  C02_Cylinder.h .cpp C02_LineTrace.h .cpp C03_MultiTrace.h .cpp
Utilities
	CHelpers.h
CAnimInstance.h .cpp CGameMode.h .cpp CPlayer.h .cpp

 
Actor 안에 Camera가 있으면 조정가능?
 
 
 

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Trace

 

Line vs. Sweep
 
Line
 
Sweep

• 충돌체의 모양 정의: Box, Sphere, Capsule 

 
Multi일 때 Channel, Objects 차이가 생긴다 (Line과 Sweep 둘 다 해당).

• Object는 블락(Block)만 체크한다.
• Chanel은 첫번째 블락(Block)까지 체크한다. ex. 유리창 깨트리고 벽에 박힌다.

 

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Line Trace

 
C02_LineTrace.h

#pragma once
#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "C02_LineTrace.generated.h"

DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FLineTraceResult, class AActor*, InActor, FLinearColor, InColor);

UCLASS()
class U2212_03_API AC02_LineTrace : public AActor
{
	GENERATED_BODY()
	
public:	
	AC02_LineTrace();

protected:
	virtual void BeginPlay() override;

public:	
	virtual void Tick(float DeltaTime) override;

private:
	UFUNCTION()
		void StartLaunch(class AActor* InActor, FLinearColor InColor);//Dynamic은 매개변수 이름이 똑같아야 한다.

public:
	UPROPERTY(BlueprintAssignable)
		FLineTraceResult OnLineTraceResult;

private:
	TArray<class AC02_Cylinder*> Cylinders;
};

 
 
C02_LineTrace.cpp

#include "04_Trace/C02_LineTrace.h"
#include "Global.h"
#include "C02_Cylinder.h"
#include "GameFramework/Character.h" //실제적으로 실행시켜주는 역할

AC02_LineTrace::AC02_LineTrace()
{
	PrimaryActorTick.bCanEverTick = true;

}

void AC02_LineTrace::BeginPlay()
{
	Super::BeginPlay();

	CHelpers::FindActors<AC02_Cylinder>(GetWorld(), Cylinders);

	//Delegate 사용
	OnLineTraceResult.AddDynamic(this, &AC02_LineTrace::StartLaunch);
}

void AC02_LineTrace::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);

	FVector start = Cylinders[0]->GetActorLocation();
	FVector end = Cylinders[1]->GetActorLocation();

	//DrawDebugLIne
	{
		start.Z -= 20;
		end.Z -= 20;

		DrawDebugLine(GetWorld(), start, end, FColor::Blue);
	}

	//LineTrace
	{
		start.Z += 40;
		end.Z += 40;

		TArray<AActor*> ignores;
		ignores.Add(Cylinders[0]);
		ignores.Add(Cylinders[1]);

		FHitResult hitResult;

		UKismetSystemLibrary::LineTraceSingleByProfile(GetWorld(), start, end, "Pawn", false, ignores, EDrawDebugTrace::ForOneFrame, hitResult, true);

		if(hitResult.bBlockingHit)
		{
			if (OnLineTraceResult.IsBound())
				OnLineTraceResult.Broadcast(hitResult.GetActor(), FLinearColor::MakeRandomColor());
		}

	}
}

void AC02_LineTrace::StartLaunch(AActor* InActor, FLinearColor InColor)
{
	ACharacter* character = Cast<ACharacter>(InActor); //InActor를 Character로 캐스팅
	CheckNull(character);//character==nullptr이면 return

	character->LaunchCharacter(FVector(0, 0, 50), true, false);//Launch 오버라이드

}

※ 참고 - LaunchCharcter 함수

void ACharacter::LaunchCharacter(FVector LaunchVelocity, bool bXYOverride, bool bZOverride)
{
	UE_LOG(LogCharacter, Verbose, TEXT("ACharacter::LaunchCharacter '%s' (%f,%f,%f)"), *GetName(), LaunchVelocity.X, LaunchVelocity.Y, LaunchVelocity.Z);

	if (CharacterMovement)
	{
		FVector FinalVel = LaunchVelocity;
		const FVector Velocity = GetVelocity();

		if (!bXYOverride)
		{
			FinalVel.X += Velocity.X;
			FinalVel.Y += Velocity.Y;
		}
		if (!bZOverride)
		{
			FinalVel.Z += Velocity.Z;
		}

		CharacterMovement->Launch(FinalVel);

		OnLaunched(LaunchVelocity, bXYOverride, bZOverride);
	}
}

 
 
 
 
BP_C02_LineTrace

UPROPERTY(BlueprintAssignable)
	FLineTraceResult OnLineTraceResult;

UPROPERTY(BlueprintAssignable)는 Event Dispatcher를 만든다.
 
 
https://docs.unrealengine.com/4.27/ko/ProgrammingAndScripting/Blueprints/TechnicalGuide/ExtendingBlueprints/

블루프린트에 게임플레이 요소 노출시키기

 

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실행화면

 

• DrawDebugLine 선과 Capsule이 충돌하여 Launch가 발동한다.
• 충돌 시 BP에서 만든 ChangePlayerColor가 실행되어 Player의 색이 바뀐다.  

 
 
 

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MultiTrace

 

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중요!!) Channel Trace와 Object Trace의 차이

 

C=Channel, O=Object

Channel은 첫 번째 블락까지 겹친 애들 다 체크한다.
Object는 오브젝트 무시하고 블락(Block)만 체크한다.
 
예시 상황) 총알이 날라와 유리창을 깨고 방 안의 벽에 박혔다.

• Overlap - 유리창이 깨지는 효과를 구현할 수 있다.
• Block - 총알이 벽에 박히는 것을 구현할 수 있다. 

 
LineTraceMulti vs. LineTraceMultiForObjects

//Channel
UKismetSystemLibrary::LineTraceMulti(GetWorld(), start1, end1, ETraceTypeQuery::TraceTypeQuery1, false, ignores, EDrawDebugTrace::ForOneFrame, hitResults1, true);
//Object
UKismetSystemLibrary::LineTraceMultiForObjects(GetWorld(), start2, end2, types, false, ignores, EDrawDebugTrace::ForOneFrame, hitResults2, true);

 

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벽 배치

 

겹친 연산(=Overlap 연산)

블록 연산

 

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Multi Trace

 
C03_MultiTrace.h

#pragma once
#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "C03_MultiTrace.generated.h"

UCLASS()
class U2212_03_API AC03_MultiTrace : public AActor
{
	GENERATED_BODY()

private:
	UPROPERTY(VisibleAnywhere)
		class USceneComponent* Root;

	UPROPERTY(VisibleAnywhere)
		class UTextRenderComponent* Text;
	
public:	
	AC03_MultiTrace();

protected:
	virtual void BeginPlay() override;

public:	
	virtual void Tick(float DeltaTime) override;

private:
	float TotalTime;
};

 
 
C03_MultiTrace.cpp

#include "04_Trace/C03_MultiTrace.h"
#include "Global.h"
#include "Components/TextRenderComponent.h"

AC03_MultiTrace::AC03_MultiTrace()
{
	PrimaryActorTick.bCanEverTick = true;

	CHelpers::CreateComponent<USceneComponent>(this, &Root, "Root");

	CreateTextRender();
}

void AC03_MultiTrace::BeginPlay()
{
	Super::BeginPlay();

}

void AC03_MultiTrace::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);

	FVector start = GetActorLocation();
	FVector start1 = FVector(start.X + 50, start.Y, start.Z);
	FVector start2 = FVector(start.X - 50, start.Y, start.Z);

	FVector end1 = start1 + GetActorForwardVector() * 600;
	FVector end2 = start2 + GetActorForwardVector() * 600;

	TArray<AActor*> ignores;
	//Multi로 쏘니 hitResult가 여러개여서 배열로 만들어준다.
	TArray<FHitResult> hitResults1; 
	TArray<FHitResult> hitResults2;

	//Channel
	UKismetSystemLibrary::LineTraceMulti(GetWorld(), start1, end1, ETraceTypeQuery::TraceTypeQuery1, false, ignores, EDrawDebugTrace::ForOneFrame, hitResults1, true);

	//Objects
	TArray<TEnumAsByte<EObjectTypeQuery>> types;
	types.Add(EObjectTypeQuery::ObjectTypeQuery1);

	UKismetSystemLibrary::LineTraceMultiForObjects(GetWorld(), start2, end2, types, false, ignores, EDrawDebugTrace::ForOneFrame, hitResults2, true);

	TotalTime += DeltaTime;
	if(TotalTime >= 2.0f)
	{
		TotalTime = 0.0f;

		CLog::Log(FString::Printf(L"-- Channel : %d", hitResults1.Num()));
		for (const FHitResult& hitResult : hitResults1)
		{
			FString str = FString::Printf(L"Block : %d, %s", hitResult.bBlockingHit, *hitResult.GetActor()->GetName());
			CLog::Log(str);
		}

		CLog::Log(FString::Printf(L"-- Objects : %d", hitResults2.Num()));
		for (const FHitResult& hitResult : hitResults2)
			CLog::Log(hitResult.GetActor()->GetName());
	}

}

 
 

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실행화면

 

 

• Channel의 경우 맨 앞의 Overlap을 체크하고 뒤에 있는 Block을 연산한다. 하지만 그 뒤의 Block들은 연산하지 않는다.
• 반면에 Object의 경우 맨 앞의 Overlap을 통과하고 뒤에 있는 Block은 모두 연산한다.  

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TPS 기본세팅

 

Characters
	CAnimInstance.h .cpp CPlayer.h .cpp
Utilities
	CHelpers.h CLog.h .cpp
CGameMode.h .cpp Global.h

 
 

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프로젝트 세팅

 

 
 
 
 
U2212_04.Build.cs

using UnrealBuildTool;

public class U2212_04 : ModuleRules
{
	public U2212_04(ReadOnlyTargetRules Target) : base(Target)
	{
		PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
	
        PublicIncludePaths.Add(ModuleDirectory); //경로찾기!!

		PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore" });

		PrivateDependencyModuleNames.AddRange(new string[] {  });
	}
}

PublicIncludePaths.Add(ModuleDirectory); 추가

• 경로를 찾는데 필요한 코드이다.

 

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