【菜菜丸的菜鸟教程】钻水管和吃金币

1. 钻水管

思路：预先录制跳水管动画，使用Animator，在满足条件时(人物接触水管且按空格键)播放动画和音效。

过程：默认状态>跳入水管>人物缩小>位移到另一个水管>人物放大>恢复默认状态

主要函数：

(1)协程函数

StartCoroutine(jumpintotube)和IEnumerator jumpintotube()配合使用。从跳入管子到恢复默认状态的所有动作均在IEnumerator中完成。

等待时间的格式：yield return new WaitForSeconds(float);

(2)线性插值函数

设置：计时器(初始值为0，动态值为 += Time.deltaTime)、变化前的位置/大小和变化后的位置/大小。

gameObject.transform.localScale = Vector3.Lerp(startScaleSize, toScale, counter / duration);

脚本：

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

public class PlayerMovement : MonoBehaviour
{
   public float turnSpeed = 20f;

    Animator m_Animator;
    Rigidbody m_Rigidbody;
    Vector3 m_Movement;
    Quaternion m_Rotation = Quaternion.identity;

    bool touchTube;
    public AudioSource jump;
    public AudioSource intoTube;
    public float duration;
    public GameObject tube2;

    void Start ()
    {
        m_Animator = GetComponent<Animator> ();
        m_Rigidbody = GetComponent<Rigidbody> ();
    }

    void FixedUpdate ()
    {
        float horizontal = Input.GetAxis ("Horizontal");
        float vertical = Input.GetAxis ("Vertical");

        m_Movement.Set(horizontal, 0f, vertical);
        m_Movement.Normalize ();

        bool hasHorizontalInput = !Mathf.Approximately (horizontal, 0f);
        bool hasVerticalInput = !Mathf.Approximately (vertical, 0f);
        bool isRunning = hasHorizontalInput || hasVerticalInput;
        m_Animator.SetBool ("IsRunning", isRunning);

        Vector3 desiredForward = Vector3.RotateTowards (transform.forward, m_Movement, turnSpeed * Time.deltaTime, 0f);
        m_Rotation = Quaternion.LookRotation (desiredForward);

        if (touchTube == true)
        {
            if (Input.GetKeyDown("space"))
            {
                m_Animator.SetBool ("IsJumping", true);
                jump.Play();
                StartCoroutine(jumpintotube());
            }
         }
     }

    IEnumerator jumpintotube()
    {
        yield return new WaitForSeconds(1f);
        intoTube.Play();
        float counter = 0;
        Vector3 startScaleSize = gameObject.transform.localScale;
        Vector3 startPosition = gameObject.transform.position;
        Vector3 toScale = new Vector3 (0.1f, 0.1f, 0.1f);
        Vector3 toScale2 = new Vector3 (1f, 1f, 1f);
        Vector3 toPosition = new Vector3 (0.98f, 0, 0.38f);
        Vector3 toPosition2 = new Vector3 (tube2.transform.position.x, tube2.transform.position.y + 0.7f, tube2.transform.position.z);
        while (counter < duration)
        {
            counter += Time.deltaTime;
            gameObject.transform.localScale = Vector3.Lerp(startScaleSize, toScale, counter / duration);
            gameObject.transform.position = Vector3.Lerp(startPosition, toPosition, counter / duration);
            yield return null;
        }
        gameObject.transform.position = new Vector3 (tube2.transform.position.x, tube2.transform.position.y, tube2.transform.position.z);
        jump.Stop();
        intoTube.Stop();
        m_Animator.SetBool ("IsJumping", false);       
        yield return new WaitForSeconds(1f);
        intoTube.Play();
        float counter2 = 0;
        Vector3 startPosition2 = gameObject.transform.position;

        while (counter2 < duration)
        {
            counter2 += Time.deltaTime;
            gameObject.transform.localScale = Vector3.Lerp(startScaleSize, toScale2, counter2 / duration);
            gameObject.transform.position = Vector3.Lerp(startPosition2, toPosition2, counter2 / duration);           
            yield return null;
        }
    }

    void OnCollisionEnter(Collision collision)
    {
        if (collision.collider.tag == "Tube")
        {
            touchTube = true;
        }
    }
    void OnAnimatorMove ()
    {
        m_Rigidbody.MovePosition (m_Rigidbody.position + m_Movement * Time.deltaTime * 2f);
        m_Rigidbody.MoveRotation (m_Rotation);
    }
}

2. 吃金币

思路：金币的消失与重现，本来想用SetActive来做，结果发现金币物体设成false以后，碰撞器也随之消失了，所以没法通过OnTriggerExit来变回true。经过研究，最后是用renderer.enabled = false来做，这样只会影响renderer组件，而不会影响碰撞器，就可以通过OnTriggerExit让renderer变回true了

脚本：

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

public class CoinMovement : MonoBehaviour
{
    public float speed;
    public AudioSource coin;
    public AudioClip coinSound;
    public Renderer coin_Renderer;

    void Update()
    {
        transform.Rotate(Vector3.up * Time.deltaTime * speed, Space.World);
    }

void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.CompareTag("Player"))
        {
            coin.Play();
            StartCoroutine(WaitForSound());
        }
    }

    IEnumerator WaitForSound()
    {
        float coinSoundDuration = coinSound.length;
        coin_Renderer.enabled = false;
        yield return new WaitForSeconds(coinSoundDuration);
    }

    void OnTriggerExit(Collider other)
    {
         if (other.gameObject.CompareTag("Player"))
        {
            Debug.Log("Exit");
            coin_Renderer.enabled = true;
        }
    }
}

示范视频 https://www.bilibili.com/video/BV1qZ4y1w79y/