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Assets/SteamVR/InteractionSystem/Samples/BuggyBuddy/WheelDust.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Valve.VR.InteractionSystem.Sample
+{
+    public class WheelDust : MonoBehaviour
+    {
+        private WheelCollider col;
+
+        public ParticleSystem p;
+
+        public float EmissionMul;
+
+        public float velocityMul = 2;
+
+        public float maxEmission;
+
+        public float minSlip;
+
+        [HideInInspector]
+        public float amt;
+
+        [HideInInspector]
+        public Vector3 slip;
+
+        private float emitTimer;
+
+
+        private void Start()
+        {
+            col = GetComponent<WheelCollider>();
+            StartCoroutine(emitter());
+        }
+
+        private void Update()
+        {
+            slip = Vector3.zero;
+            if (col.isGrounded)
+            {
+                WheelHit hit;
+                col.GetGroundHit(out hit);
+
+                slip += Vector3.right * hit.sidewaysSlip;
+                slip += Vector3.forward * -hit.forwardSlip;
+                //print(slip);
+            }
+            amt = slip.magnitude;
+            //print(amt);
+        }
+
+        private IEnumerator emitter()
+        {
+            while (true)
+            {
+                while (emitTimer < 1)
+                {
+                    yield return null;
+                    if (amt > minSlip)
+                    {
+                        emitTimer += Mathf.Clamp((EmissionMul * amt), 0.01f, maxEmission);
+                    }
+                }
+                emitTimer = 0;
+                DoEmit();
+            }
+        }
+
+        private void DoEmit()
+        {
+            p.transform.rotation = Quaternion.LookRotation(transform.TransformDirection(slip));
+
+#if UNITY_2017_1_OR_NEWER
+            ParticleSystem.MainModule mainModule = p.main;
+            mainModule.startSpeed = velocityMul * amt;
+#else
+            p.startSpeed = velocityMul * amt;
+#endif
+
+            p.Emit(1);
+        }
+    }
+}