Fix air spline locomotion and flat spline

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

@@ -48,8 +48,7 @@ void UPwnCharacterMovementComponent::OnMovementModeChanged(EMovementMode Previou
 	Super::OnMovementModeChanged(PreviousMovementMode, PreviousCustomMode);
 
 	// React to changes in the movement mode.
-	if (MovementMode == MOVE_Custom && CustomMovementMode == SplineWalking)
-	{
+	if (MovementMode == MOVE_Custom && CustomMovementMode == SplineWalking) {
 		// make sure we update our new floor/base on initial entry of the walking physics
 		FindFloor(UpdatedComponent->GetComponentLocation(), CurrentFloor, false);
 		AdjustFloorHeight();
@@ -112,7 +111,7 @@ bool UPwnCharacterMovementComponent::IsCustomMovementMode(const ECustomMovementM
 void UPwnCharacterMovementComponent::RecomputeTangentAndAcceleration() {
 	Tangent2D = CombatPath->Spline->GetTangentAtDistanceAlongSpline(DistanceAlongSpline, ESplineCoordinateSpace::World).GetSafeNormal2D();
 	// Recalculate acceleration so the input is relative to the spline
-	Acceleration = Tangent2D * Acceleration.Size2D() * FMath::Sign(Acceleration.X);
+	Acceleration = Tangent2D * Acceleration.Size2D() * FMath::Sign(Acceleration.X) * DotDirection;
 }
 
 void UPwnCharacterMovementComponent::UpdatePawnVelocity(const float TimeTick) {
@@ -140,10 +139,23 @@ void UPwnCharacterMovementComponent::UpdatePawnVelocity(const float TimeTick) {
 	DistanceAlongSpline = NewDistanceAlongSpline;
 }
 
-void UPwnCharacterMovementComponent::UpdateDistanceAlongSpline() {
+void UPwnCharacterMovementComponent::UpdateDistanceAlongSplineAndLocation() {
 	// Maintain coherent distance along spline with location
-	const float InputKey = CombatPath->Spline->FindInputKeyClosestToWorldLocation(UpdatedComponent->GetComponentLocation());
-	DistanceAlongSpline = CombatPath->Spline->GetDistanceAlongSplineAtSplineInputKey(InputKey);
+	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)) {
+
+		FVector ImpactPoint = Hit.ImpactPoint;
+		const float InputKey = CombatPath->Spline->FindInputKeyClosestToWorldLocation(ImpactPoint);
+		DistanceAlongSpline = CombatPath->Spline->GetDistanceAlongSplineAtSplineInputKey(InputKey);
+	}
+
+	FVector TargetLocation = CombatPath->Spline->GetLocationAtDistanceAlongSpline(DistanceAlongSpline, ESplineCoordinateSpace::World);
+	TargetLocation.Z = UpdatedComponent->GetComponentLocation().Z;
+	UpdatedComponent->SetWorldLocation(TargetLocation);
 }
 
 void UPwnCharacterMovementComponent::PhysSplineWalking(const float DeltaTime, int32 Iterations) {
@@ -183,15 +195,15 @@ void UPwnCharacterMovementComponent::PhysSplineWalking(const float DeltaTime, in
 		const FVector OldLocation = UpdatedComponent->GetComponentLocation();
 		const FFindFloorResult OldFloor = CurrentFloor;
 
+		RecomputeTangentAndAcceleration(); /* -- PAWN MODIFICATIONS -- */
+		Acceleration.Z = 0.f;
+
 		RestorePreAdditiveRootMotionVelocity();
 
 		// Ensure velocity is horizontal.
 		MaintainHorizontalGroundVelocity();
 		const FVector OldVelocity = Velocity;
 
-		RecomputeTangentAndAcceleration(); /* -- PAWN MODIFICATIONS -- */
-		Acceleration.Z = 0.f;
-
 		// Apply acceleration
 		if (!HasAnimRootMotion() && !CurrentRootMotion.HasOverrideVelocity()) {
 			CalcVelocity(TimeTick, GroundFriction, false, GetMaxBrakingDeceleration());
@@ -343,7 +355,7 @@ void UPwnCharacterMovementComponent::PhysSplineWalking(const float DeltaTime, in
 		MaintainHorizontalGroundVelocity();
 	}
 
-	UpdateDistanceAlongSpline(); /* -- PAWN MODIFICATIONS -- */
+	UpdateDistanceAlongSplineAndLocation(); /* -- PAWN MODIFICATIONS -- */
 }
 
 UE_DISABLE_OPTIMIZATION
@@ -353,6 +365,8 @@ void UPwnCharacterMovementComponent::PhysSplineFalling(const float DeltaTime, in
 		return;
 	}
 
+	RecomputeTangentAndAcceleration(); /* -- PAWN MODIFICATIONS -- */
+
 	FVector FallAcceleration = GetFallingLateralAcceleration(DeltaTime);
 	FallAcceleration.Z = 0.f;
 	const bool bHasLimitedAirControl = ShouldLimitAirControl(DeltaTime, FallAcceleration);
@@ -367,8 +381,6 @@ void UPwnCharacterMovementComponent::PhysSplineFalling(const float DeltaTime, in
 		const FQuat PawnRotation = UpdatedComponent->GetComponentQuat();
 		bJustTeleported = false;
 
-		RecomputeTangentAndAcceleration(); /* -- PAWN MODIFICATIONS -- */
-
 		const FVector OldVelocityWithRootMotion = Velocity;
 
 		RestorePreAdditiveRootMotionVelocity();
@@ -657,7 +669,7 @@ void UPwnCharacterMovementComponent::PhysSplineFalling(const float DeltaTime, in
 		}
 	}
 
-	UpdateDistanceAlongSpline(); /* -- PAWN MODIFICATIONS -- */
+	UpdateDistanceAlongSplineAndLocation(); /* -- PAWN MODIFICATIONS -- */
 }
 
 UE_ENABLE_OPTIMIZATION

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

@@ -19,6 +19,26 @@ void APwnCombatPlatformerPath::BeginPlay() {
 	UPwnGameplayModeSubsystem* Subsystem = GetWorld()->GetSubsystem<UPwnGameplayModeSubsystem>();
 	check(Subsystem);
 	Subsystem->RegisterCombatPath(this);
+
+	const FVector FirstPointLocation = Spline->GetLocationAtSplinePoint(0, ESplineCoordinateSpace::World);
+	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);
+
+		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);
+	}
+
+	Spline->UpdateSpline();
+	
 	Super::BeginPlay();
 }
 

Pawn_Unreal/Source/Pawn/Public/Characters/PwnCharacterMovementComponent.h

@@ -52,7 +52,7 @@ private:
 	
 	void UpdatePawnVelocity(const float TimeTick);
 
-	void UpdateDistanceAlongSpline();
+	void UpdateDistanceAlongSplineAndLocation();
 
 	void PhysSplineWalking(const float DeltaTime, int32 Iterations);