Added Observation Scene to show the Replay

Assets/Samples/Cinemachine/3.1.3/Shared Assets/Scripts/SimpleBullet.cs

@@ -0,0 +1,67 @@
+using System.Collections;
+using UnityEngine;
+
+namespace Unity.Cinemachine.Samples
+{
+    public class SimpleBullet : MonoBehaviour
+    {
+        public LayerMask CollisionLayers = 1;
+        public float Speed = 500;
+        public float Lifespan = 3;
+
+        [Tooltip("Stretch factor in the direction of motion while flying")]
+        public float Stretch = 6;
+
+        float m_Speed;
+        Vector3 m_SpawnPoint;
+
+        void OnValidate()
+        {
+            Speed = Mathf.Max(1, Speed);
+            Lifespan = Mathf.Max(0.2f, Lifespan);
+        }
+
+        void OnEnable()
+        {
+            m_Speed = Speed;
+            m_SpawnPoint = transform.position;
+            SetStretch(1);
+            StartCoroutine(DeactivateAfter());
+        }
+
+        void Update()
+        {
+            if (m_Speed > 0)
+            {
+                var t = transform;
+                if (Physics.Raycast(
+                    t.position, t.forward, out var hitInfo, m_Speed * Time.deltaTime, CollisionLayers,
+                    QueryTriggerInteraction.Ignore))
+                {
+                    t.position = hitInfo.point;
+                    m_Speed = 0;
+                    SetStretch(1);
+                }
+                var deltaPos = m_Speed * Time.deltaTime;
+                t.position += deltaPos * t.forward;
+
+                // Clamp the stretch to avoid the bullet stretching back past the spawn point.
+                // This code assumes that the bullet length is 1.
+                SetStretch(Mathf.Min(1 + deltaPos * Stretch, Vector3.Distance(t.position, m_SpawnPoint)));
+            }
+        }
+
+        void SetStretch(float stretch)
+        {
+            var scale = transform.localScale;
+            scale.z = stretch;
+            transform.localScale = scale;
+        }
+
+        IEnumerator DeactivateAfter()
+        {
+            yield return new WaitForSeconds(Lifespan);
+            gameObject.SetActive(false);
+        }
+    }
+}