Add Flatten Spline into Combat Platformer Path

Pawn_Unreal/Source/Pawn/Private/Characters/PwnCharacterMovementComponent.cpp

@@ -1,6 +1,7 @@
 #include "Characters/PwnCharacterMovementComponent.h"
 
 #include "Characters/PwnCharacterBase.h"
+#include "Components/CapsuleComponent.h"
 #include "Components/SplineComponent.h"
 #include "GameplayModes/PwnGameplayModeSubsystem.h"
 #include "GameplayModes/Combat/PwnCombatPlatformerPath.h"
@@ -86,16 +87,24 @@ void UPwnCharacterMovementComponent::EnterSplineFollowMode() {
 	const UPwnGameplayModeSubsystem* Subsystem = GetWorld()->GetSubsystem<UPwnGameplayModeSubsystem>();
 	check(Subsystem);
 
-	FVector OutLocation;
+
 	APwnCombatPlatformerPath* OutCombatPath;
-	float OutDistanceAloneSpline;
-	if (Subsystem->FindClosestCombatPathLocation(UpdatedComponent->GetComponentLocation(), OutLocation, OutCombatPath, OutDistanceAloneSpline)) {
-		DistanceAlongSpline = OutDistanceAloneSpline;
+	if (Subsystem->FindClosestCombatPathLocation(UpdatedComponent->GetComponentLocation(), OutCombatPath)) {
 		CombatPath = OutCombatPath;
 		DotDirection = CombatPath->Reversed ? -1.0f : 1.0f;
-		FVector TargetLocation = CombatPath->Spline->GetLocationAtDistanceAlongSpline(DistanceAlongSpline, ESplineCoordinateSpace::World);
-		TargetLocation.Z = UpdatedComponent->GetComponentLocation().Z;
-		UpdatedComponent->SetWorldLocation(TargetLocation);
+
+		float ClosestInputKey = CombatPath->Spline->FindInputKeyClosestToWorldLocation(UpdatedComponent->GetComponentLocation());
+		FVector ClosestLocation = CombatPath->Spline->GetLocationAtSplineInputKey(ClosestInputKey, ESplineCoordinateSpace::World);
+
+		FHitResult Hit;
+		if (GetWorld()->LineTraceSingleByChannel(Hit, ClosestLocation, ClosestLocation + FVector(0.0f, 0.0f, -10000.0f),
+			ECC_Visibility, IGNORE_OWNER_PARAMS)) {
+			const float SplineKey = CombatPath->FlattenSpline->FindInputKeyClosestToWorldLocation(Hit.ImpactPoint);
+			DistanceAlongSpline = CombatPath->FlattenSpline->GetDistanceAlongSplineAtSplineInputKey(SplineKey);
+
+			ClosestLocation.Z += CharacterOwner->GetCapsuleComponent()->GetScaledCapsuleHalfHeight();
+			UpdatedComponent->SetWorldLocation(ClosestLocation);
+		}
 	}
 }
 
@@ -109,7 +118,7 @@ bool UPwnCharacterMovementComponent::IsCustomMovementMode(const ECustomMovementM
 }
 
 void UPwnCharacterMovementComponent::RecomputeTangentAndAcceleration() {
-	Tangent2D = CombatPath->Spline->GetTangentAtDistanceAlongSpline(DistanceAlongSpline, ESplineCoordinateSpace::World).GetSafeNormal2D();
+	Tangent2D = CombatPath->FlattenSpline->GetTangentAtDistanceAlongSpline(DistanceAlongSpline, ESplineCoordinateSpace::World).GetSafeNormal2D();
 	// Recalculate acceleration so the input is relative to the spline
 	Acceleration = Tangent2D * Acceleration.Size2D() * FMath::Sign(Acceleration.X) * DotDirection;
 }
@@ -127,9 +136,9 @@ void UPwnCharacterMovementComponent::UpdatePawnVelocity(const float TimeTick) {
 	VelocityDirection = FMath::Sign(VelocityDirection); // -1, 0 or 1
 
 	float NewDistanceAlongSpline = DistanceAlongSpline + VelocityDirection * VelocitySize2D * TimeTick;
-	NewDistanceAlongSpline = FMath::Clamp(NewDistanceAlongSpline, 0.0f, CombatPath->Spline->GetSplineLength());
+	NewDistanceAlongSpline = FMath::Clamp(NewDistanceAlongSpline, 0.0f, CombatPath->FlattenSpline->GetSplineLength());
 
-	FVector TargetLocation = CombatPath->Spline->GetLocationAtDistanceAlongSpline(NewDistanceAlongSpline, ESplineCoordinateSpace::World);
+	FVector TargetLocation = CombatPath->FlattenSpline->GetLocationAtDistanceAlongSpline(NewDistanceAlongSpline, ESplineCoordinateSpace::World);
 	TargetLocation.Z = OldLocation.Z;
 
 	const FVector Direction = (TargetLocation - OldLocation).GetSafeNormal2D();
@@ -142,18 +151,16 @@ void UPwnCharacterMovementComponent::UpdatePawnVelocity(const float TimeTick) {
 void UPwnCharacterMovementComponent::UpdateDistanceAlongSplineAndLocation() {
 	// Maintain coherent distance along spline with location
 	FHitResult Hit;
-	FCollisionQueryParams QueryParams;
-	QueryParams.AddIgnoredActor(GetOwner());
 	if (GetWorld()->LineTraceSingleByChannel(Hit, UpdatedComponent->GetComponentLocation(),
 	                                     UpdatedComponent->GetComponentLocation() + FVector(0.0f, 0.0f, -10000.0f),
-	                                     ECC_Visibility, QueryParams)) {
+	                                     ECC_Visibility, IGNORE_OWNER_PARAMS)) {
 
 		FVector ImpactPoint = Hit.ImpactPoint;
-		const float InputKey = CombatPath->Spline->FindInputKeyClosestToWorldLocation(ImpactPoint);
-		DistanceAlongSpline = CombatPath->Spline->GetDistanceAlongSplineAtSplineInputKey(InputKey);
+		const float InputKey = CombatPath->FlattenSpline->FindInputKeyClosestToWorldLocation(ImpactPoint);
+		DistanceAlongSpline = CombatPath->FlattenSpline->GetDistanceAlongSplineAtSplineInputKey(InputKey);
 	}
 
-	FVector TargetLocation = CombatPath->Spline->GetLocationAtDistanceAlongSpline(DistanceAlongSpline, ESplineCoordinateSpace::World);
+	FVector TargetLocation = CombatPath->FlattenSpline->GetLocationAtDistanceAlongSpline(DistanceAlongSpline, ESplineCoordinateSpace::World);
 	TargetLocation.Z = UpdatedComponent->GetComponentLocation().Z;
 	UpdatedComponent->SetWorldLocation(TargetLocation);
 }

Pawn_Unreal/Source/Pawn/Private/GameplayModes/Combat/PwnCombatPlatformerPath.cpp

@@ -7,6 +7,7 @@ APwnCombatPlatformerPath::APwnCombatPlatformerPath() {
 	PrimaryActorTick.bCanEverTick = false;
 
 	Spline = CreateDefaultSubobject<USplineComponent>(TEXT("Spline"));
+	Spline->ReparamStepsPerSegment = 100.0f;
 	SetRootComponent(Spline);
 
 #if WITH_EDITORONLY_DATA
@@ -20,24 +21,29 @@ void APwnCombatPlatformerPath::BeginPlay() {
 	check(Subsystem);
 	Subsystem->RegisterCombatPath(this);
 
+	FlattenSpline = NewObject<USplineComponent>(this, TEXT("FlattenSpline"));
+	FlattenSpline->SetClosedLoop(Spline->IsClosedLoop(), false);
+	FlattenSpline->ReparamStepsPerSegment = Spline->ReparamStepsPerSegment;
+	FlattenSpline->ClearSplinePoints(false);
+
 	const FVector FirstPointLocation = Spline->GetLocationAtSplinePoint(0, ESplineCoordinateSpace::World);
-	float FirstPointZ = FirstPointLocation.Z;
+	const float FirstPointZ = FirstPointLocation.Z;
 
 	const int32 PointsCount = Spline->GetNumberOfSplinePoints();
 	for (int i = 0; i < PointsCount; ++i) {
 		FVector NewLocation = Spline->GetLocationAtSplinePoint(i, ESplineCoordinateSpace::World);
 		NewLocation.Z = FirstPointZ;
-		Spline->SetLocationAtSplinePoint(i, NewLocation, ESplineCoordinateSpace::World, false);
+		FlattenSpline->AddSplinePoint(NewLocation, ESplineCoordinateSpace::World, false);
 
 		FVector ArriveTangent = Spline->GetArriveTangentAtSplinePoint(i, ESplineCoordinateSpace::World);
 		FVector LeaveTangent = Spline->GetLeaveTangentAtSplinePoint(i, ESplineCoordinateSpace::World);
 
 		ArriveTangent.Z = 0;
 		LeaveTangent.Z = 0;
-		Spline->SetTangentsAtSplinePoint(i, ArriveTangent, LeaveTangent, ESplineCoordinateSpace::World, false);
+		FlattenSpline->SetTangentsAtSplinePoint(i, ArriveTangent, LeaveTangent, ESplineCoordinateSpace::World, false);
 	}
 
-	Spline->UpdateSpline();
+	FlattenSpline->UpdateSpline();
 	
 	Super::BeginPlay();
 }

Pawn_Unreal/Source/Pawn/Private/GameplayModes/PwnGameplayModeSubsystem.cpp

@@ -41,11 +41,8 @@ void UPwnGameplayModeSubsystem::UnregisterCombatPath(APwnCombatPlatformerPath* C
 	CombatPaths.Remove(CombatPath);
 }
 
-bool UPwnGameplayModeSubsystem::FindClosestCombatPathLocation(const FVector& Location, FVector& OutCombatPathLocation,
-                                                              APwnCombatPlatformerPath*& OutCombatPath, float& OutDistanceAlongSpline) const {
+bool UPwnGameplayModeSubsystem::FindClosestCombatPathLocation(const FVector& Location, APwnCombatPlatformerPath*& OutCombatPath) const {
 	float ShortestDistance = FLT_MAX;
-	float ClosestKey = 0.0f;
-	FVector ClosestLocation = FVector::ZeroVector;
 	APwnCombatPlatformerPath* ClosestCombatPath = nullptr;
 	bool Found = false;
 
@@ -57,17 +54,13 @@ bool UPwnGameplayModeSubsystem::FindClosestCombatPathLocation(const FVector& Loc
 		const float CurrentDistance = FVector::DistSquared(Location, CurrentLocation);
 		if (CurrentDistance < ShortestDistance) {
 			ShortestDistance = CurrentDistance;
-			ClosestKey = CurrentKey;
-			ClosestLocation = CurrentLocation;
 			ClosestCombatPath = CombatPath;
 			Found = true;
 		}
 	}
 
 	if (Found) {
-		OutCombatPathLocation = ClosestLocation;
 		OutCombatPath = ClosestCombatPath;
-		OutDistanceAlongSpline = OutCombatPath->Spline->GetDistanceAlongSplineAtSplineInputKey(ClosestKey);
 	}
 	return Found;
 }

Pawn_Unreal/Source/Pawn/Public/GameplayModes/Combat/PwnCombatPlatformerPath.h

@@ -19,7 +19,7 @@ protected:
 	virtual void EndPlay(const EEndPlayReason::Type EndPlayReason) override;
 
 public:
-	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Components")
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
 	TObjectPtr<USplineComponent> Spline;
 
 	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Combat Platformer Path")
@@ -27,4 +27,7 @@ public:
 
 	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Combat Platformer Path")
 	bool SwapCamera;
+
+	UPROPERTY(Transient, BlueprintReadOnly)
+	TObjectPtr<USplineComponent> FlattenSpline;
 };

Pawn_Unreal/Source/Pawn/Public/GameplayModes/PwnGameplayModeSubsystem.h

@@ -41,9 +41,8 @@ public:
 	UFUNCTION()
 	void UnregisterCombatPath(APwnCombatPlatformerPath* CombatPath);
 
-	UFUNCTION()
-	bool FindClosestCombatPathLocation(const FVector& Location, FVector& OutCombatPathLocation, APwnCombatPlatformerPath*& OutCombatPath,
-	                                   float& OutDistanceAlongSpline) const;
+	UFUNCTION(BlueprintCallable)
+	bool FindClosestCombatPathLocation(const FVector& Location, APwnCombatPlatformerPath*& OutCombatPath) const;
 
 public:
 	UPROPERTY(BlueprintAssignable)

Pawn_Unreal/Source/Pawn/Public/Utils/EngineUtils.h

@@ -10,3 +10,12 @@
 
 #define BOOL_TO_TEXT(Bool) ((Bool) ? TEXT("True") : TEXT("False"))
 #define BOOL_TO_STR(Bool) ((Bool) ? "True" : "False")
+
+#define IGNORE_OWNER_PARAMS GetIgnoreActorParams(GetOwner())
+#define IGNORE_THIS_PARAMS GetIgnoreActorParams(this)
+
+inline FCollisionQueryParams GetIgnoreActorParams(const AActor* Actor) {
+	FCollisionQueryParams Params;
+	Params.AddIgnoredActor(Actor);
+	return Params;
+}