Add rotation inertia to the camera of the UE Motion FPS plugin

MotionCameraComponent.cpp

void UMotionCameraComponent::GetCameraView(float DeltaTime, FMinimalViewInfo& DesiredView)
{
    // ...

    for (const TTuple<FString, UE::Math::TRotator<double>> & StaticRotationOffset: CameraStaticRotationOffsets)
    {
        UpdatedCameraRotation = FRotator(FQuat(UpdatedCameraRotation) * FQuat(StaticRotationOffset.Value));
    }

    UpdatedCameraRotation = FRotator(FQuat(UpdatedCameraRotation) * FQuat(CameraRotatorFromCurves));


    // Apply inertia effect based on camera rotation

    if (bFirstInitialization)
    {
        CurrentRotation = UpdatedCameraRotation;
        bFirstInitialization = false;
    }

    if (bEnableCameraInertia && CurrentRotation.Equals(UpdatedCameraRotation, 0.01f) == false)
    {
        // Interpolate towards the target rotation
        CurrentRotation = FMath::RInterpTo(CurrentRotation, UpdatedCameraRotation, DeltaTime, CameraInertiaStrength);
    }
    else
    {
        CurrentRotation = UpdatedCameraRotation;
    }
    
    DesiredView.Rotation = CurrentRotation;
    SetWorldRotation(CurrentRotation);

    // ...
}

MotionCameraComponent.h

class MOTIONCORE_API UMotionCameraComponent : public UCameraComponent
{
    GENERATED_BODY()

  //...

    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Configuration")
    float CameraInertiaStrength = 1.0f;

    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Configuration")
    bool bEnableCameraInertia = false;
    
    UPROPERTY()
    bool bFirstInitialization = true;

    UPROPERTY()
    FRotator CurrentRotation = FRotator::ZeroRotator;

  //...
}