update

Assets/FPS/Scripts/Gameplay/PositionBobbing.cs

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+
+using UnityEngine;
+
+namespace Unity.FPS.Gameplay
+{
+    public class PositionBobbing : MonoBehaviour
+    {
+        [Tooltip("Frequency at which the item will move up and down")]
+        public float VerticalBobFrequency = 1f;
+
+        [Tooltip("Distance the item will move up and down")]
+        public float BobbingAmount = 0.5f;
+
+        Vector3 m_StartPosition;
+
+        void Start()
+        {
+            // Remember start position for animation
+            m_StartPosition = transform.position;
+        }
+
+        void Update()
+        {
+            // Handle bobbing
+            float bobbingAnimationPhase = ((Mathf.Sin(Time.time * VerticalBobFrequency) * 0.5f) + 0.5f) * BobbingAmount;
+            transform.position = m_StartPosition + Vector3.up * bobbingAnimationPhase;
+        }
+    }
+}