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

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+using System.Collections;
+using UnityEngine;
+
+namespace UnityStandardAssets.Vehicles.Car
+{
+    [RequireComponent(typeof (AudioSource))]
+    public class WheelEffects : MonoBehaviour
+    {
+        public Transform SkidTrailPrefab;
+        public static Transform skidTrailsDetachedParent;
+        public ParticleSystem skidParticles;
+        public bool skidding { get; private set; }
+        public bool PlayingAudio { get; private set; }
+
+
+        private AudioSource m_AudioSource;
+        private Transform m_SkidTrail;
+        private WheelCollider m_WheelCollider;
+
+
+        private void Start()
+        {
+            skidParticles = transform.root.GetComponentInChildren<ParticleSystem>();
+
+            if (skidParticles == null)
+            {
+                Debug.LogWarning(" no particle system found on car to generate smoke particles", gameObject);
+            }
+            else
+            {
+                skidParticles.Stop();
+            }
+
+            m_WheelCollider = GetComponent<WheelCollider>();
+            m_AudioSource = GetComponent<AudioSource>();
+            PlayingAudio = false;
+
+            if (skidTrailsDetachedParent == null)
+            {
+                skidTrailsDetachedParent = new GameObject("Skid Trails - Detached").transform;
+            }
+        }
+
+
+        public void EmitTyreSmoke()
+        {
+            skidParticles.transform.position = transform.position - transform.up*m_WheelCollider.radius;
+            skidParticles.Emit(1);
+            if (!skidding)
+            {
+                StartCoroutine(StartSkidTrail());
+            }
+        }
+
+
+        public void PlayAudio()
+        {
+            m_AudioSource.Play();
+            PlayingAudio = true;
+        }
+
+
+        public void StopAudio()
+        {
+            m_AudioSource.Stop();
+            PlayingAudio = false;
+        }
+
+
+        public IEnumerator StartSkidTrail()
+        {
+            skidding = true;
+            m_SkidTrail = Instantiate(SkidTrailPrefab);
+            while (m_SkidTrail == null)
+            {
+                yield return null;
+            }
+            m_SkidTrail.parent = transform;
+            m_SkidTrail.localPosition = -Vector3.up*m_WheelCollider.radius;
+        }
+
+
+        public void EndSkidTrail()
+        {
+            if (!skidding)
+            {
+                return;
+            }
+            skidding = false;
+            m_SkidTrail.parent = skidTrailsDetachedParent;
+            Destroy(m_SkidTrail.gameObject, 10);
+        }
+    }
+}