Test
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DedMoroz132
184
Assets/Standard Assets/Vehicles/Car/Scripts/CarAudio.cs
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184
Assets/Standard Assets/Vehicles/Car/Scripts/CarAudio.cs
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using System;
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using UnityEngine;
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using Random = UnityEngine.Random;
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namespace UnityStandardAssets.Vehicles.Car
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{
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[RequireComponent(typeof (CarController))]
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public class CarAudio : MonoBehaviour
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{
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// This script reads some of the car's current properties and plays sounds accordingly.
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// The engine sound can be a simple single clip which is looped and pitched, or it
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// can be a crossfaded blend of four clips which represent the timbre of the engine
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// at different RPM and Throttle state.
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// the engine clips should all be a steady pitch, not rising or falling.
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// when using four channel engine crossfading, the four clips should be:
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// lowAccelClip : The engine at low revs, with throttle open (i.e. begining acceleration at very low speed)
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// highAccelClip : Thenengine at high revs, with throttle open (i.e. accelerating, but almost at max speed)
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// lowDecelClip : The engine at low revs, with throttle at minimum (i.e. idling or engine-braking at very low speed)
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// highDecelClip : Thenengine at high revs, with throttle at minimum (i.e. engine-braking at very high speed)
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// For proper crossfading, the clips pitches should all match, with an octave offset between low and high.
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public enum EngineAudioOptions // Options for the engine audio
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{
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Simple, // Simple style audio
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FourChannel // four Channel audio
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}
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public EngineAudioOptions engineSoundStyle = EngineAudioOptions.FourChannel;// Set the default audio options to be four channel
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public AudioClip lowAccelClip; // Audio clip for low acceleration
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public AudioClip lowDecelClip; // Audio clip for low deceleration
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public AudioClip highAccelClip; // Audio clip for high acceleration
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public AudioClip highDecelClip; // Audio clip for high deceleration
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public float pitchMultiplier = 1f; // Used for altering the pitch of audio clips
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public float lowPitchMin = 1f; // The lowest possible pitch for the low sounds
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public float lowPitchMax = 6f; // The highest possible pitch for the low sounds
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public float highPitchMultiplier = 0.25f; // Used for altering the pitch of high sounds
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public float maxRolloffDistance = 500; // The maximum distance where rollof starts to take place
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public float dopplerLevel = 1; // The mount of doppler effect used in the audio
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public bool useDoppler = true; // Toggle for using doppler
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private AudioSource m_LowAccel; // Source for the low acceleration sounds
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private AudioSource m_LowDecel; // Source for the low deceleration sounds
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private AudioSource m_HighAccel; // Source for the high acceleration sounds
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private AudioSource m_HighDecel; // Source for the high deceleration sounds
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private bool m_StartedSound; // flag for knowing if we have started sounds
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private CarController m_CarController; // Reference to car we are controlling
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private void StartSound()
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{
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// get the carcontroller ( this will not be null as we have require component)
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m_CarController = GetComponent<CarController>();
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// setup the simple audio source
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m_HighAccel = SetUpEngineAudioSource(highAccelClip);
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// if we have four channel audio setup the four audio sources
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if (engineSoundStyle == EngineAudioOptions.FourChannel)
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{
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m_LowAccel = SetUpEngineAudioSource(lowAccelClip);
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m_LowDecel = SetUpEngineAudioSource(lowDecelClip);
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m_HighDecel = SetUpEngineAudioSource(highDecelClip);
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}
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// flag that we have started the sounds playing
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m_StartedSound = true;
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}
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private void StopSound()
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{
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//Destroy all audio sources on this object:
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foreach (var source in GetComponents<AudioSource>())
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{
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Destroy(source);
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}
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m_StartedSound = false;
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}
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// Update is called once per frame
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private void Update()
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{
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// get the distance to main camera
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float camDist = (Camera.main.transform.position - transform.position).sqrMagnitude;
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// stop sound if the object is beyond the maximum roll off distance
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if (m_StartedSound && camDist > maxRolloffDistance*maxRolloffDistance)
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{
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StopSound();
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}
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// start the sound if not playing and it is nearer than the maximum distance
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if (!m_StartedSound && camDist < maxRolloffDistance*maxRolloffDistance)
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{
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StartSound();
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}
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if (m_StartedSound)
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{
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// The pitch is interpolated between the min and max values, according to the car's revs.
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float pitch = ULerp(lowPitchMin, lowPitchMax, m_CarController.Revs);
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// clamp to minimum pitch (note, not clamped to max for high revs while burning out)
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pitch = Mathf.Min(lowPitchMax, pitch);
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if (engineSoundStyle == EngineAudioOptions.Simple)
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{
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// for 1 channel engine sound, it's oh so simple:
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m_HighAccel.pitch = pitch*pitchMultiplier*highPitchMultiplier;
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m_HighAccel.dopplerLevel = useDoppler ? dopplerLevel : 0;
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m_HighAccel.volume = 1;
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}
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else
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{
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// for 4 channel engine sound, it's a little more complex:
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// adjust the pitches based on the multipliers
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m_LowAccel.pitch = pitch*pitchMultiplier;
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m_LowDecel.pitch = pitch*pitchMultiplier;
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m_HighAccel.pitch = pitch*highPitchMultiplier*pitchMultiplier;
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m_HighDecel.pitch = pitch*highPitchMultiplier*pitchMultiplier;
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// get values for fading the sounds based on the acceleration
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float accFade = Mathf.Abs(m_CarController.AccelInput);
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float decFade = 1 - accFade;
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// get the high fade value based on the cars revs
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float highFade = Mathf.InverseLerp(0.2f, 0.8f, m_CarController.Revs);
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float lowFade = 1 - highFade;
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// adjust the values to be more realistic
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highFade = 1 - ((1 - highFade)*(1 - highFade));
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lowFade = 1 - ((1 - lowFade)*(1 - lowFade));
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accFade = 1 - ((1 - accFade)*(1 - accFade));
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decFade = 1 - ((1 - decFade)*(1 - decFade));
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// adjust the source volumes based on the fade values
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m_LowAccel.volume = lowFade*accFade;
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m_LowDecel.volume = lowFade*decFade;
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m_HighAccel.volume = highFade*accFade;
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m_HighDecel.volume = highFade*decFade;
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// adjust the doppler levels
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m_HighAccel.dopplerLevel = useDoppler ? dopplerLevel : 0;
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m_LowAccel.dopplerLevel = useDoppler ? dopplerLevel : 0;
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m_HighDecel.dopplerLevel = useDoppler ? dopplerLevel : 0;
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m_LowDecel.dopplerLevel = useDoppler ? dopplerLevel : 0;
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}
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}
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}
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// sets up and adds new audio source to the gane object
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private AudioSource SetUpEngineAudioSource(AudioClip clip)
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{
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// create the new audio source component on the game object and set up its properties
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AudioSource source = gameObject.AddComponent<AudioSource>();
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source.clip = clip;
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source.volume = 0;
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source.loop = true;
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// start the clip from a random point
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source.time = Random.Range(0f, clip.length);
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source.Play();
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source.minDistance = 5;
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source.maxDistance = maxRolloffDistance;
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source.dopplerLevel = 0;
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return source;
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}
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// unclamped versions of Lerp and Inverse Lerp, to allow value to exceed the from-to range
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private static float ULerp(float from, float to, float value)
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{
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return (1.0f - value)*from + value*to;
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}
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}
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}
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