Section 8: Advanced Movement - Lecture 117

Hip Aim Offset

Config/DefaultEngine.ini

@@ -1,8 +1,8 @@
 
 
 [/Script/EngineSettings.GameMapsSettings]
-GameDefaultMap=/Game/ModSciInteriors/Maps/Example_2_Dynamic.Example_2_Dynamic
-EditorStartupMap=/Game/ModSciInteriors/Maps/Example_2_Dynamic.Example_2_Dynamic
+GameDefaultMap=/Game/_Game/Maps/DefaultMap.DefaultMap
+EditorStartupMap=/Game/_Game/Maps/DefaultMap.DefaultMap
 GlobalDefaultGameMode=/Game/_Game/GameMode/ShooterGameModeBaseBP.ShooterGameModeBaseBP_C
 
 [/Script/HardwareTargeting.HardwareTargetingSettings]

Content/_Game/Character/Animations/Jog_Bwd_Stop_Trimmed2.uasset

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:ea499b26b1ff7085faf02c40cb4642ecb7c60c09db55a5f7de4d85aea8e4be60
-size 1199

Content/_Game/Character/Animations/Jog_Left_Start_Trimmed2.uasset

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:7b8c1a9f82a3ae31625ce118399a72146e4249f1c1b9c8dbdfffc91861ff6682
-size 1215

Content/_Game/Character/Animations/Jog_Right_Start_Trimmed2.uasset

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:47ee89e3a2a3584ffc0f9b4b2915c59f0a653ce08699975527a7dddfc6cd1dde
-size 1223

Source/Shooter/ShooterAnimInstance.cpp

@@ -7,13 +7,26 @@
 #include "GameFramework/CharacterMovementComponent.h"
 #include "Kismet/KismetMathLibrary.h"
 
+UShooterAnimInstance::UShooterAnimInstance() :
+	Speed(0.f),
+	bIsInAir(false),
+	bIsAccelerating(false),
+	MovementOffsetYaw(0.f),
+	LastMovementOffsetYaw(0.f),
+	bAiming(false),
+	CharacterYaw(0.f),
+	CharacterYawLastFrame(0.f),
+	RootYawOffset(0.f)
+{
+}
+
 void UShooterAnimInstance::UpdateAnimationProperties(float DeltaTime)
 {
-	if (ShooterCharacter)
+	if (!ShooterCharacter)
 		ShooterCharacter = Cast<AShooterCharacter>(TryGetPawnOwner());
 
-	if (ShooterCharacter)
-	{
+	if (!ShooterCharacter)	return;
+	
 	// Get the speed of the character from velocity
 	FVector Velocity{ ShooterCharacter->GetVelocity() };
 	Velocity.Z = 0;
@@ -36,7 +49,8 @@ void UShooterAnimInstance::UpdateAnimationProperties(float DeltaTime)
 	}
 
 	bAiming = ShooterCharacter->GetAiming();
-	}
+
+	TurnInPlace();
 }
 
 void UShooterAnimInstance::NativeInitializeAnimation()
@@ -45,3 +59,54 @@ void UShooterAnimInstance::NativeInitializeAnimation()
 
 	ShooterCharacter = Cast<AShooterCharacter>(TryGetPawnOwner());
 }
+
+void UShooterAnimInstance::TurnInPlace()
+{
+	if (!ShooterCharacter)	return;
+	if (Speed > 0)
+	{
+		// Don't want to turn in place; Character is moving
+		RootYawOffset = 0.f;
+		CharacterYaw = ShooterCharacter->GetActorRotation().Yaw;
+		CharacterYawLastFrame = CharacterYaw;
+		RotationCurve = 0.f;
+		RotationCurveLastFrame = 0.f;
+	}
+	else
+	{
+		CharacterYawLastFrame = CharacterYaw;
+		CharacterYaw = ShooterCharacter->GetActorRotation().Yaw;
+		const float YawDelta { CharacterYaw - CharacterYawLastFrame };
+
+		// Root Yaw Offset, updated and clamped to [-180, 180]
+		RootYawOffset = UKismetMathLibrary::NormalizeAxis(RootYawOffset - YawDelta);
+
+		// 1.0 if turning, 0.0 if not
+		const float Turning { GetCurveValue(TEXT("Turning")) };
+		if (Turning)
+		{
+			RotationCurveLastFrame = RotationCurve;
+			RotationCurve = GetCurveValue(TEXT("Rotation"));
+			const float DeltaRotation { RotationCurve = RotationCurveLastFrame };
+
+			// If RootYawOffset > 0, -> Turning Left, If RootYawOffset < 0, -> Turning Right
+			RootYawOffset > 0 ? RootYawOffset -= DeltaRotation : RootYawOffset += DeltaRotation;
+
+			const float ABSRootYawOffset { FMath::Abs(RootYawOffset) };
+			if (ABSRootYawOffset)
+			{
+				const float YawExcess { ABSRootYawOffset - 90.f };
+				RootYawOffset > 0 ? RootYawOffset -= YawExcess : RootYawOffset += YawExcess;	
+			}
+		}
+		
+		/*if (GEngine)
+		{
+			GEngine->AddOnScreenDebugMessage(1, -1, FColor::Blue,
+			FString::Printf(TEXT("CharacterYaw: %f"), CharacterYaw));
+
+			GEngine->AddOnScreenDebugMessage(2, -1, FColor::Red,
+			FString::Printf(TEXT("RootYawOffset: %f"), RootYawOffset));
+		}*/
+	}
+}

Source/Shooter/ShooterAnimInstance.h

@@ -17,11 +17,16 @@ class SHOOTER_API UShooterAnimInstance : public UAnimInstance
 
 public:
 
+	UShooterAnimInstance();
+	
 	UFUNCTION(BlueprintCallable)
 	void UpdateAnimationProperties(float DeltaTime);
 
 	virtual void NativeInitializeAnimation() override;
 
+protected:
+	/** Handle turning in place variables */
+	void TurnInPlace();
 private:
 
 	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Movement, meta = (AllowPrivateAccess = true))
@@ -49,4 +54,19 @@ private:
 
 	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Movement, meta = (AllowPrivateAccess = true))
 	bool bAiming;
+
+	/** Yaw of the character this frame */
+	float CharacterYaw;
+
+	/** Yaw of the character the previous frame */
+	float CharacterYawLastFrame;
+
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Turn In Place", meta = (AllowPrivateAccess = true))
+	float RootYawOffset;
+
+	/** Rotation curve value this frame */
+	float RotationCurve;
+	
+	/** Rotation curve value last frame */
+	float RotationCurveLastFrame;
 };