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Assets/Standard Assets/Vehicles/Car/Scripts/CarSelfRighting.cs

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+using System;
+using UnityEngine;
+
+namespace UnityStandardAssets.Vehicles.Car
+{
+    public class CarSelfRighting : MonoBehaviour
+    {
+        // Automatically put the car the right way up, if it has come to rest upside-down.
+        [SerializeField] private float m_WaitTime = 3f;           // time to wait before self righting
+        [SerializeField] private float m_VelocityThreshold = 1f;  // the velocity below which the car is considered stationary for self-righting
+
+        private float m_LastOkTime; // the last time that the car was in an OK state
+        private Rigidbody m_Rigidbody;
+
+
+        private void Start()
+        {
+            m_Rigidbody = GetComponent<Rigidbody>();
+        }
+
+
+        private void Update()
+        {
+            // is the car is the right way up
+            if (transform.up.y > 0f || m_Rigidbody.velocity.magnitude > m_VelocityThreshold)
+            {
+                m_LastOkTime = Time.time;
+            }
+
+            if (Time.time > m_LastOkTime + m_WaitTime)
+            {
+                RightCar();
+            }
+        }
+
+
+        // put the car back the right way up:
+        private void RightCar()
+        {
+            // set the correct orientation for the car, and lift it off the ground a little
+            transform.position += Vector3.up;
+            transform.rotation = Quaternion.LookRotation(transform.forward);
+        }
+    }
+}