feat: Character camera and simple cover system

Exo.uproject

@@ -32,5 +32,10 @@
 			"Name": "MDL",
 			"Enabled": false
 		}
+	],
+	"TargetPlatforms": [
+		"Linux",
+		"LinuxArm64",
+		"Windows"
 	]
 }

Source/Exo/Private/Characters/ExoPlayerCharacter.cpp

@@ -8,6 +8,7 @@
 #include "GameFramework/CharacterMovementComponent.h"
 #include "Items/AmmoBoxBase.h"
 #include "Items/HealthBoxBase.h"
+#include "Kismet/GameplayStatics.h"
 #include "Player/InteractionComponent.h"
 #include "Widget/WBP_PlayerUI.h"
 
@@ -26,9 +27,15 @@ AExoPlayerCharacter::AExoPlayerCharacter()
 	Weapon->CastShadow = false;
 	Weapon->SetRelativeLocation(FVector(-50.f, 0.f, -90.f));
 	
-	bUseControllerRotationPitch = false;
+	//bUseControllerRotationPitch = false;
-	bUseControllerRotationYaw = true;
+	//bUseControllerRotationYaw = true;
-	bUseControllerRotationRoll = false;
+	//bUseControllerRotationRoll = false;
+
+	// Setup camera component
+	CameraComponent = CreateDefaultSubobject<UCameraComponent>(TEXT("CameraComponent"));
+	CameraComponent->AttachToComponent(RootComponent, FAttachmentTransformRules::KeepRelativeTransform);
+	CameraComponent->bUsePawnControlRotation = true;
+	CameraComponent->SetRelativeLocation(FVector(0.0f, 0.0f, BaseEyeHeight));
 }
 
 void AExoPlayerCharacter::BeginPlay()
@@ -36,7 +43,8 @@ void AExoPlayerCharacter::BeginPlay()
 	Super::BeginPlay();
 
 	GetCapsuleComponent()->OnComponentBeginOverlap.AddDynamic(this, &AExoPlayerCharacter::OnActorBeginOverlap);
-
+	//UGameplayStatics::GetPlayerCameraManager(GetWorld(), 0)->SetViewTarget(this);
+	StandingEyeHeight = CameraComponent->GetRelativeLocation().Z;
 
 
 	PlayerHud = CreateWidget<UWBP_PlayerUI>(GetWorld(),PlayerHudClass);

Source/Exo/Private/Player/ExoPlayerController.cpp

@@ -7,6 +7,7 @@
 #include "Characters/ExoPlayerCharacter.h"
 #include "GameFramework/Character.h"
 #include "GameFramework/CharacterMovementComponent.h"
+#include "Kismet/GameplayStatics.h"
 
 AExoPlayerController::AExoPlayerController()
 {
@@ -28,17 +29,34 @@ void AExoPlayerController::BeginPlay()
 		Subsystem->AddMappingContext(InputContext, 0);
 	}
 	
-	InteractionComponent = PlayerCharacter->FindComponentByClass<UInteractionComponent>();
+	//InteractionComponent = PlayerCharacter->FindComponentByClass<UInteractionComponent>();
-	ShootingComponent = PlayerCharacter->FindComponentByClass<UShootingComponent>();
+	//ShootingComponent = PlayerCharacter->FindComponentByClass<UShootingComponent>();
+	InteractionComponent = PlayerCharacter->InteractionComponent;
+	ShootingComponent = PlayerCharacter->ShootingComponent;
 
 	// Ustawianie w komponencie poruszania pr<70>dko<6B>ci zapisanej w characterze
 	PlayerCharacter->GetCharacterMovement()->MaxWalkSpeed = PlayerCharacter->WalkSpeed;
+
+	// Oblicz prawidłową maksymalną wysokość na którą można wychylić się z nad osłony
+	
+	UE_LOG(LogTemp, Display, TEXT("MaxCoverAimHeight: %f"), MaxCoverAimHeight);
 }
 
 void AExoPlayerController::PlayerTick(float DeltaTime)
 {
 	Super::PlayerTick(DeltaTime);
 
+	// TESTING
+	if (bIsInCover)
+	{
+		AdjustCameraWhileInCover();
+	}
+	UpdateCoverStandHeight(DeltaTime);
+
+	if (bShowCoverSystemDebug)
+	{
+		GEngine->AddOnScreenDebugMessage(2, -1, FColor::Red, FString::Printf(TEXT("In cover: %s"), bIsInCover ? "true" : "false"));
+	}
 }
 
 void AExoPlayerController::SetupInputComponent()
@@ -141,11 +159,36 @@ void AExoPlayerController::PlayerStartCrouch()
 	}
 
 	PlayerCharacter->Crouch();
+	PlayerCharacter->CameraComponent->SetRelativeLocation(FVector(
+		0.0f,
+		0.0f,
+		PlayerCharacter->CrouchedEyeHeight)
+		);
+	
+	// Start checking for cover
+	bIsInCover = CheckForCover();
+	GetWorld()->GetTimerManager().SetTimer(
+		CoverCheckTimer,
+		this,
+		&AExoPlayerController::OnCoverTimer,
+		CoverCheckRate,
+		true
+		);
 }
 
 void AExoPlayerController::PlayerStopCrouch()
 {
 	PlayerCharacter->UnCrouch();
+	PlayerCharacter->CameraComponent->SetRelativeLocation(FVector(
+		0.0f,
+		0.0f,
+		PlayerCharacter->BaseEyeHeight)
+		);
+	
+	// Stop checking for cover
+	GetWorld()->GetTimerManager().ClearTimer(CoverCheckTimer);
+	bIsInCover = false;
+	TargetCoverStandAlpha = 0.0f;
 }
 
 void AExoPlayerController::ResetSlide()
@@ -224,3 +267,258 @@ void AExoPlayerController::PlayerReload()
 {
 	ShootingComponent->Reload();
 }
+
+bool AExoPlayerController::CheckForCover()
+{
+	// Cover is recalculated every time the player crouches or stops moving while crouched
+	// Cover targets are cleared completely when player stands up again or dies
+
+	// Do a simple 8-directional line trace
+	FVector TraceDirection = PlayerCharacter->GetActorForwardVector();
+	FVector TraceStart = PlayerCharacter->GetActorLocation();
+	TraceStart.Z -= PlayerCharacter->GetCapsuleComponent()->GetScaledCapsuleHalfHeight() - CoverObstacleMinHeight;
+	FCollisionQueryParams QueryParams;
+	QueryParams.AddIgnoredActor(PlayerCharacter);
+	
+	TArray<FHitResult> ValidHits;
+	for (int i = 0; i <= 8; i++)
+	{
+		// Trace for possible cover at set distance
+		FHitResult Hit;
+		FVector TraceEnd = TraceStart + (TraceDirection * MaxDistanceFromCover);
+		GetWorld()->LineTraceSingleByChannel(
+			Hit,
+			TraceStart,
+			TraceEnd,
+			CoverTraceChannel,
+			QueryParams
+			);
+
+		if (bShowCoverSystemDebug)
+		{
+			// DEBUG
+			DrawDebugLine(GetWorld(), TraceStart,TraceEnd,
+				Hit.bBlockingHit ? FColor::Blue : FColor::Red,
+				false, 5.0f, 0, 1.0f);
+		}
+		
+		if (Hit.bBlockingHit == true) {
+			// Check if this particular hit isn't against a wall (>CoverMaxHeight)
+		
+			FHitResult SphereHit;
+			FVector SpherePosition = Hit.ImpactPoint +
+				FVector(
+					0.0f, 0.0f,
+					CoverObstacleMaxHeight + CoverAimWindowRadius - CoverObstacleMinHeight);
+			
+			GetWorld()->SweepSingleByChannel(
+				SphereHit,
+				SpherePosition,
+				SpherePosition,
+				FQuat::Identity,
+				CoverTraceChannel,
+				FCollisionShape::MakeSphere(CoverAimWindowRadius),
+				QueryParams);
+		
+			if (bShowCoverSystemDebug)
+			{
+				DrawDebugSphere(GetWorld(), SphereHit.TraceStart, CoverAimWindowRadius, 8,
+					Hit.bBlockingHit ? FColor::Blue : FColor::Red,
+					false, 5.0f, 0, 1);
+			}
+		
+			if (SphereHit.bBlockingHit == false)
+			{
+				ValidHits.Add(Hit);
+			}
+		}
+		
+
+		// Rotate trace to search in another direction next time
+		TraceDirection = TraceDirection.RotateAngleAxis(45, FVector(0, 0, 1));
+		//UE_LOG(LogTemp, Display, TEXT("Check Cover %d"), i);
+	}
+
+	return ValidHits.Num() > 0;
+}
+
+void AExoPlayerController::AdjustCameraWhileInCover()
+{
+	if (!bIsInCover)
+	{
+		return;
+	}
+
+	MaxCoverAimHeight = PlayerCharacter->StandingEyeHeight * CoverAimStandFactor;
+	
+	//FVector StartOffset = GetCharacter()->GetActorForwardVector() * 20.0f;
+	FVector ObstacleTraceStart = GetCharacter()->GetActorLocation();
+	ObstacleTraceStart.Z += GetCharacter()->CrouchedEyeHeight;
+	FVector ObstacleTraceEnd =
+	 	ObstacleTraceStart + PlayerCameraManager->GetCameraRotation().Vector() * CoverAimFreeDistance;
+	FCollisionQueryParams QueryParams;
+	QueryParams.AddIgnoredActor(PlayerCharacter);
+	TEnumAsByte<ECollisionChannel> ObstacleTraceChannel = ECC_WorldStatic;
+	
+	FHitResult Hit;
+	bool bFreeSpace = false;
+
+	// Trace until no hit is found (free space to aim)
+	for (int i = 0; i < MaxCoverAimHeight; i += 2*CoverAimWindowRadius)
+	{
+		ObstacleTraceStart.Z += i;
+		ObstacleTraceEnd.Z += i;
+		
+		GetWorld()->SweepSingleByChannel(
+		 Hit,
+		 ObstacleTraceStart,
+		 ObstacleTraceEnd,
+		 FQuat::Identity,
+		 ObstacleTraceChannel,
+		 FCollisionShape::MakeSphere(CoverAimWindowRadius),
+		 QueryParams
+		 );
+
+		if (bShowCoverSystemDebug)
+		{
+			DrawDebugSphere(GetWorld(), Hit.Location, CoverAimWindowRadius, 8,
+				Hit.bBlockingHit ? FColor::Blue : FColor::Red,
+				false, 0.0f, 0, 0);
+		}
+		
+		if (Hit.bBlockingHit == false)
+		{
+			UE_LOG(LogTemp, Display, TEXT("Free space"));
+			bFreeSpace = true;
+			break;
+		}
+	}
+
+	if (bFreeSpace)
+	{
+		TargetCoverStandAlpha = FMath::GetMappedRangeValueClamped(
+			UE::Math::TVector2<float>(GetCharacter()->CrouchedEyeHeight, GetCharacter()->CrouchedEyeHeight + MaxCoverAimHeight),
+			UE::Math::TVector2(0.0f, 1.0f),
+			Hit.TraceStart.Z
+			);
+		if (bShowCoverSystemDebug)
+		{
+			DrawDebugLine(GetWorld(), Hit.TraceStart, Hit.TraceEnd, FColor::Red);
+		}
+	}
+	
+	 
+
+	// IDEA FOR A MORE COMPLEX SYSTEM IN THE FUTURE:
+	//vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
+	// To not introduce accidental flickering and optimize it a bit, all of this should run
+	// ONLY on cover update
+
+	// FVector CrouchedEyeWorldPosition = PlayerCharacter->GetActorLocation();
+	// CrouchedEyeWorldPosition.Z += PlayerCharacter->CrouchedEyeHeight;
+	// FVector CoverCeiling = CrouchedEyeWorldPosition + MaxCoverAimHeight;
+	// float PlayerCapsuleRadius = PlayerCharacter->GetCapsuleComponent()->GetScaledCapsuleHalfHeight();
+	// TEnumAsByte<ECollisionChannel> ObstacleTraceChannel = ECC_WorldStatic;
+	// FCollisionQueryParams QueryParams;
+	// QueryParams.AddIgnoredActor(PlayerCharacter);
+	//
+	// // Shoot ray up at maximum cover length to determine how high the player can "stand up"
+	// FHitResult WallTopHit;
+	// GetWorld()->SweepSingleByChannel(
+	// 	WallTopHit,
+	// 	CrouchedEyeWorldPosition,
+	// 	CoverCeiling,
+	// 	FQuat::Identity,
+	// 	ObstacleTraceChannel,
+	// 	FCollisionShape::MakeSphere(PlayerCapsuleRadius),
+	// 	QueryParams
+	// 	);
+	//
+	// FVector CeilingWorldLocation;
+	// if (WallTopHit.bBlockingHit == true)
+	// {
+	// 	CeilingWorldLocation = WallTopHit.Location;
+	// }
+	// else
+	// {
+	// 	CeilingWorldLocation = WallTopHit.TraceEnd;
+	// }
+	//
+	// // From hit location (or if no hit - from end position) shoot ray towards camera's forward
+	// // vector at minimum cover length
+	//
+	// constexpr float WallFinderDistance = 75.0f;
+	// FVector WallFinderDirection = PlayerCharacter->GetActorForwardVector();
+	// WallFinderDirection.Z = 0.0f; // Not needed if the player always stays upright
+	//
+	// GetWorld()->LineTraceSingleByChannel(
+	// 	WallTopHit,
+	// 	CeilingWorldLocation,
+	// 	CeilingWorldLocation + (WallFinderDirection * WallFinderDistance),
+	// 	ObstacleTraceChannel,
+	// 	QueryParams
+	// 	);
+	//
+	// // regardless of the hit result shoot multi-ray downwards from end location
+	// // with maximum cover length
+	//
+	// FVector WallTopTraceStart = WallTopHit.bBlockingHit ? WallTopHit.Location : WallTopHit.TraceEnd;
+	// TArray<FHitResult> ValidHitsCandidateArray;
+	//
+	// GetWorld()->LineTraceMultiByChannel(
+	// ValidHitsCandidateArray,
+	// WallTopTraceStart,
+	// WallTopTraceStart + (FVector(0.0f, 0.0f, 0.0f) * MaxCoverAimHeight),
+	// ObstacleTraceChannel,
+	// QueryParams
+	// );
+
+	// On every ray hit trace an in-place sphere to determine if the aiming spot is valid
+
+	// All valid aiming spots are collected and the lowest (smallest Z) is chosen
+
+	// Sphere trace from camera forward a certain distance to regulate camera position while
+	// aiming up and down // TODO: elaborate
+}
+
+void AExoPlayerController::UpdateCoverStandHeight(float DeltaTime)
+{
+	// if (FMath::IsNearlyEqual(CoverStandAlpha, TargetCoverStandAlpha, 0.01f))
+	// {
+	// 	return;
+	// }
+
+	CoverStandAlpha = FMath::Lerp(CoverStandAlpha, TargetCoverStandAlpha, DeltaTime * 5.0f);
+	//CoverStandAlpha = TargetCoverStandAlpha;
+	
+	// BANDAID SOLUTION
+	const float NewZ = FMath::Lerp(
+				PlayerCharacter->CrouchedEyeHeight,
+				PlayerCharacter->StandingEyeHeight,
+				CoverStandAlpha
+				);
+	
+	PlayerCharacter->CameraComponent->SetRelativeLocation(
+		FVector(0.0f, 0.0f, NewZ)
+	);
+
+	if (bShowCoverSystemDebug && GEngine)
+	{
+		GEngine->AddOnScreenDebugMessage(1, -1, FColor::Red, FString::Printf(TEXT("Current cover stand alpha: %f"), CoverStandAlpha));
+	}
+}
+
+void AExoPlayerController::OnCoverTimer()
+{
+	bIsInCover = CheckForCover();
+	if (bIsInCover == false)
+	{
+		TargetCoverStandAlpha = 0.0f;
+		UpdateCoverStandHeight(GetWorld()->GetDeltaSeconds());
+	}
+}
+
+void AExoPlayerController::DebugCoverSystem(bool show)
+{
+	bShowCoverSystemDebug = show;
+}

Source/Exo/Public/Characters/Components/ShootingComponent.h

@@ -104,6 +104,11 @@ private:
 	void ReloadCompleted();
 	AActor* ExecuteLineTrace(float LineRange);
 
+	// Cover logic - ToQly
+	
+
+	//
+
 	FTimerHandle ShootCooldownTimer;
 	FTimerHandle ReloadTimer;
 	

Source/Exo/Public/Characters/ExoPlayerCharacter.h

@@ -3,6 +3,7 @@
 #pragma once
 
 #include "CoreMinimal.h"
+#include "Camera/CameraComponent.h"
 #include "Characters/ExoCharacterBase.h"
 #include "Components/CapsuleComponent.h"
 #include "ExoPlayerCharacter.generated.h"
@@ -28,6 +29,12 @@ public:
 	UPROPERTY(VisibleAnywhere, BlueprintReadOnly)
 	TObjectPtr<UShootingComponent> ShootingComponent;
 
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Camera")
+	TObjectPtr<UCameraComponent> CameraComponent;
+
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Camera")
+	float StandingEyeHeight;
+
 	UPROPERTY(EditAnywhere, Category = "Dodge Properties")
 	float DodgeForce = 5000.f;
 

Source/Exo/Public/Player/ExoPlayerController.h

@@ -92,6 +92,24 @@ protected:
 	UFUNCTION(BlueprintCallable, Category = "Input")
 	void PlayerReload(); // R
 
+	UFUNCTION(BlueprintCallable, Category = "Cover System")
+	bool CheckForCover();
+
+	UFUNCTION(BlueprintCallable, Category = "Cover System")
+	void AdjustCameraWhileInCover();
+
+	UFUNCTION(BlueprintCallable, Category = "Cover System")
+	void UpdateCoverStandHeight(float DeltaTime);
+
+	void OnCoverTimer();
+
+	float MapAlphaToCoverStandHeight(float Alpha);
+
+	// DEBUG
+	UFUNCTION(Exec, Category = "Cover System")
+	void DebugCoverSystem(bool show);
+	bool bShowCoverSystemDebug = false;
+
 	
 	UPROPERTY(EditAnywhere, Category = "Input")
 	TObjectPtr<UInputMappingContext> InputContext;
@@ -159,8 +177,62 @@ protected:
 	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Character")
 	TObjectPtr<AExoPlayerCharacter> PlayerCharacter;
 
+	// Czy postać gracza jest obecnie schowana za osłoną
+	UPROPERTY(EditAnywhere, Category = "Cover System")
+	bool bIsInCover = false;
+
+	/** Alpha wysokości kamery podczas wychulania zza osłony
+	 * 0 - Wysokość kucania
+	 * 1 - Maksymalna wysokość wychylenia określona przez CoverAimStandFactor
+	 **/
+	UPROPERTY(EditAnywhere, Category = "Cover System")
+	float TargetCoverStandAlpha = 0.0f;
+	
+	// Częstotliwość okresowego szukania osłon podczas kucania
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cover System")
+	float CoverCheckRate = 0.5f;
+	
+	// Dystans na którym postać jest w stanie odnaleźć osłonę
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cover System")
+	float MaxDistanceFromCover = 50.0f;
+
+	// Minimalna wysokość przeszkody którą można określić osłoną
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cover System")
+	float CoverObstacleMinHeight = 75.0f;
+
+	// Maksymalna wysokość przeszkody którą można określić osłoną
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cover System")
+	float CoverObstacleMaxHeight = 125.0f;
+
+	// Promień wolnej przestrzeni przez którą można się wychylić
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cover System")
+	float CoverAimWindowRadius = 2.0f;
+
+	// Dystans od kamery po wychyleniu który musi być wolny by dało się wychylić
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cover System")
+	float CoverAimFreeDistance = 150.0f;
+
+	/** Określa na jaki procent "Stania" postać może się podnieść podczas celowania
+	 * zza osłony. 0 -> Nie podniesie się wogóle (jakby wychylanie się było wyłączone)
+	 * 1 -> Postać jest w stanie się podnieść do pełnej wysokości, tak jakby normalnie stała
+	**/
+	UPROPERTY(EditAnywhere,
+		meta = (ClampMin = "0.0", ClampMax = "1.0",
+			UIMin = "0.0",
+			UIMax = "1.0") ,
+			BlueprintReadWrite, Category = "Cover System")
+	float CoverAimStandFactor = 0.9f;
+
+	// Trace Channel po którym szukać geometrii potencjalnych osłon
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cover System")
+	TEnumAsByte<ECollisionChannel> CoverTraceChannel = ECC_WorldStatic;
+	
 private:
 	UInteractionComponent* InteractionComponent;
 
 	UShootingComponent* ShootingComponent;
+
+	float CoverStandAlpha = 0.0f;
+	FTimerHandle CoverCheckTimer;
+	float MaxCoverAimHeight;
 };