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Assets/Scripts/Car/EasySuspension.cs

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+using UnityEngine;
+using System.Collections;
+
+[ExecuteInEditMode()]
+public class EasySuspension : MonoBehaviour {
+	[Range(0, 20)]
+	public float naturalFrequency = 10;
+
+	[Range(0, 3)]
+	public float dampingRatio = 0.8f;
+
+	[Range(-1, 1)]
+	public float forceShift = 0.03f;
+
+	public bool setSuspensionDistance = true;
+
+	void Update () {
+		// work out the stiffness and damper parameters based on the better spring model
+		foreach (WheelCollider wc in GetComponentsInChildren<WheelCollider>()) {
+			JointSpring spring = wc.suspensionSpring;
+
+			spring.spring = Mathf.Pow(Mathf.Sqrt(wc.sprungMass) * naturalFrequency, 2);
+			spring.damper = 2 * dampingRatio * Mathf.Sqrt(spring.spring * wc.sprungMass);
+
+			wc.suspensionSpring = spring;
+
+			Vector3 wheelRelativeBody = transform.InverseTransformPoint(wc.transform.position);
+			float distance = GetComponent<Rigidbody>().centerOfMass.y - wheelRelativeBody.y + wc.radius;
+
+			wc.forceAppPointDistance = distance - forceShift;
+
+			// the following line makes sure the spring force at maximum droop is exactly zero
+			if (spring.targetPosition > 0 && setSuspensionDistance)
+				wc.suspensionDistance = wc.sprungMass * Physics.gravity.magnitude / (spring.targetPosition * spring.spring);
+		}
+	}
+
+// uncomment OnGUI to observe how parameters change
+
+/*
+	public void OnGUI()
+	{
+		foreach (WheelCollider wc in GetComponentsInChildren<WheelCollider>()) {
+			GUILayout.Label (string.Format("{0} sprung: {1}, k: {2}, d: {3}", wc.name, wc.sprungMass, wc.suspensionSpring.spring, wc.suspensionSpring.damper));
+		}
+
+		var rb = GetComponent<Rigidbody> ();
+
+		GUILayout.Label ("Inertia: " + rb.inertiaTensor);
+		GUILayout.Label ("Mass: " + rb.mass);
+		GUILayout.Label ("Center: " + rb.centerOfMass);
+	}
+*/
+
+}