ジェットエンジンのエフェクトとオーディオ

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class AfterburnerController : MonoBehaviour {

    ParticleSystem afterburner;
    public Color minColour;
    private float originalStartSize;
    private float originalLifetime;
    private Color originalStartColor;

    private AudioSource engineSoundSource;
    [SerializeField] private AudioClip engineSound;
    public float engineMinDistance = 50f;
    public float engineMaxDistance = 1000f;
    public float engineDopplerLevel = 1f;
    [Range(0f, 1f)] public float engineMasterVolume;
    [SerializeField] private float engineMinThrottlePitch = 0.4f;
    [SerializeField] private float engineMaxThrottlePitch = 2f;
    [SerializeField] private float engineFwdSpeedMultiplier = 0.002f;

    // Use this for initialization
    void Start () {
        afterburner = GetComponent<ParticleSystem>();
        originalLifetime = afterburner.main.startLifetime.constant;
        originalStartSize = afterburner.main.startSize.constant;
        originalStartColor = afterburner.main.startColor.color;

        engineSoundSource = gameObject.AddComponent<AudioSource>();
        engineSoundSource.playOnAwake = false;
        engineSoundSource.clip = engineSound;
        engineSoundSource.minDistance = engineMinDistance;
        engineSoundSource.maxDistance = engineMaxDistance;
        engineSoundSource.loop = true;
        engineSoundSource.dopplerLevel = engineDopplerLevel;
        engineSoundSource.volume = engineMasterVolume;
        engineSoundSource.Play();

    }

    // Update is called once per frame
    void Update () {

        if (Input.GetKeyDown(KeyCode.Space))
        {
            afterburner.Stop();
        }
        else if (Input.GetKeyUp(KeyCode.Space))
        {
            afterburner.Play();
        }

        var enginePowerProportion = Mathf.InverseLerp(0, MyAircraftController.staticMaxSpead, MyAircraftController.speed);

        engineSoundSource.pitch = Mathf.Lerp(engineMinThrottlePitch, engineMaxThrottlePitch, enginePowerProportion);

        engineSoundSource.pitch += MyAircraftController.speed * engineFwdSpeedMultiplier;

    }
}
 

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class MyAircraftController : MonoBehaviour {

    public float maxSpead; //最大速度
    public static float staticMaxSpead; //最大速度
    public float verticalSpead; //縦の旋回速度
    public float horizontalSpead; //横の旋回加速
    public float accel; //加速
    public static float speed = 0; //現在のスピード
    private float minSpeed = 0; //最低速度 マイナスになりすぎないように

    // Use this for initialization
    void Start () {
        staticMaxSpead = maxSpead;
        //最低速度の割り出し
        minSpeed = maxSpead * (float)0.2 * -1;
    }
    
    // Update is called once per frame
    void Update () {

        //方向転換
        float v = Input.GetAxis("Vertical") * verticalSpead;
        float h = Input.GetAxis("Horizontal") * horizontalSpead;
        this.transform.Rotate(new Vector3(v, 0, -h));

        //加速処理
        if(maxSpead >= speed)
        {
            if (!Input.GetKey(KeyCode.Space))
            {
                //加速
                speed = speed + accel;
            }
        }

        //減速処理
        if (minSpeed <= speed)
        {
            if (Input.GetKey(KeyCode.Space))
            {
                speed = speed - accel;
            }

        }

        this.transform.position += transform.forward * speed * Time.deltaTime;
    }
}