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Assets/Scripts/Car/RearWheelDrive.cs

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+using UnityEngine;
+using System.Collections;
+
+public class RearWheelDrive : MonoBehaviour {
+
+	private WheelCollider[] wheels;
+
+	public float maxAngle = 30;
+	public float maxTorque = 300;
+	public GameObject wheelShape;
+
+	// here we find all the WheelColliders down in the hierarchy
+	public void Start()
+	{
+		wheels = GetComponentsInChildren<WheelCollider>();
+
+		for (int i = 0; i < wheels.Length; ++i) 
+		{
+			var wheel = wheels [i];
+
+			// create wheel shapes only when needed
+			if (wheelShape != null)
+			{
+				var ws = GameObject.Instantiate (wheelShape);
+				ws.transform.parent = wheel.transform;
+			}
+		}
+	}
+
+	// this is a really simple approach to updating wheels
+	// here we simulate a rear wheel drive car and assume that the car is perfectly symmetric at local zero
+	// this helps us to figure our which wheels are front ones and which are rear
+	public void Update()
+	{
+		float angle = maxAngle * Input.GetAxis("Horizontal");
+		float torque = maxTorque * Input.GetAxis("Vertical");
+
+		foreach (WheelCollider wheel in wheels)
+		{
+			// a simple car where front wheels steer while rear ones drive
+			if (wheel.transform.localPosition.z > 0)
+				wheel.steerAngle = angle;
+
+			if (wheel.transform.localPosition.z < 0)
+				wheel.motorTorque = torque;
+
+			// update visual wheels if any
+			if (wheelShape) 
+			{
+				Quaternion q;
+				Vector3 p;
+				wheel.GetWorldPose (out p, out q);
+
+				// assume that the only child of the wheelcollider is the wheel shape
+				Transform shapeTransform = wheel.transform.GetChild (0);
+				shapeTransform.position = p;
+				shapeTransform.rotation = q;
+				shapeTransform.localScale = new Vector3(1, 1, 1);
+			}
+
+		}
+	}
+}