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code/ViewModel.cs

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+using Sandbox;
+
+public class ViewModel : BaseViewModel
+{
+	protected float SwingInfluence => 0.05f;
+	protected float ReturnSpeed => 5.0f;
+	protected float MaxOffsetLength => 10.0f;
+	protected float BobCycleTime => 7;
+	protected Vector3 BobDirection => new Vector3( 0.0f, 1.0f, 0.5f );
+
+	private Vector3 swingOffset;
+	private float lastPitch;
+	private float lastYaw;
+	private float bobAnim;
+
+	private bool activated = false;
+
+	public override void PostCameraSetup( ref CameraSetup camSetup )
+	{
+		base.PostCameraSetup( ref camSetup );
+
+		if ( !Local.Pawn.IsValid() )
+			return;
+
+		if ( !activated )
+		{
+			lastPitch = camSetup.Rotation.Pitch();
+			lastYaw = camSetup.Rotation.Yaw();
+
+			activated = true;
+		}
+
+		Position = camSetup.Position;
+		Rotation = camSetup.Rotation;
+
+		camSetup.ViewModel.FieldOfView = FieldOfView;
+
+		var playerVelocity = Local.Pawn.Velocity;
+
+		if ( Local.Pawn is Player player )
+		{
+			var controller = player.GetActiveController();
+			if ( controller != null && controller.HasTag( "noclip" ) )
+			{
+				playerVelocity = Vector3.Zero;
+			}
+		}
+
+		var newPitch = Rotation.Pitch();
+		var newYaw = Rotation.Yaw();
+
+		var pitchDelta = Angles.NormalizeAngle( newPitch - lastPitch );
+		var yawDelta = Angles.NormalizeAngle( lastYaw - newYaw );
+
+		var verticalDelta = playerVelocity.z * Time.Delta;
+		var viewDown = Rotation.FromPitch( newPitch ).Up * -1.0f;
+		verticalDelta *= (1.0f - System.MathF.Abs( viewDown.Cross( Vector3.Down ).y ));
+		pitchDelta -= verticalDelta * 1;
+
+		var offset = CalcSwingOffset( pitchDelta, yawDelta );
+		offset += CalcBobbingOffset( playerVelocity );
+
+		Position += Rotation * offset;
+
+		lastPitch = newPitch;
+		lastYaw = newYaw;
+	}
+
+	protected Vector3 CalcSwingOffset( float pitchDelta, float yawDelta )
+	{
+		Vector3 swingVelocity = new Vector3( 0, yawDelta, pitchDelta );
+
+		swingOffset -= swingOffset * ReturnSpeed * Time.Delta;
+		swingOffset += (swingVelocity * SwingInfluence);
+
+		if ( swingOffset.Length > MaxOffsetLength )
+		{
+			swingOffset = swingOffset.Normal * MaxOffsetLength;
+		}
+
+		return swingOffset;
+	}
+
+	protected Vector3 CalcBobbingOffset( Vector3 velocity )
+	{
+		bobAnim += Time.Delta * BobCycleTime;
+
+		var twoPI = System.MathF.PI * 2.0f;
+
+		if ( bobAnim > twoPI )
+		{
+			bobAnim -= twoPI;
+		}
+
+		var speed = new Vector2( velocity.x, velocity.y ).Length;
+		speed = speed > 10.0 ? speed : 0.0f;
+		var offset = BobDirection * (speed * 0.005f) * System.MathF.Cos( bobAnim );
+		offset = offset.WithZ( -System.MathF.Abs( offset.z ) );
+
+		return offset;
+	}
+}