Lerp.localScale不工作OnTriggerEnter，Unity5.3.3，Gear VR应用程序开发

Question

我正在开发一个Gear VR应用程序，我想让我的角色在进入盒对撞机区域时缩小，我可以通过使用transform.localScale =newVector3(0.3F，0.3F，0.3F)来缩小它的范围；但是我希望它被完成，smoothly.Dont知道为什么它没有接收到这条lerp线？？有谁能帮我吗?我把我的盒子碰撞器(立方体到"Mani")贴上了标签，还有一件事，那就是OnTriggerExit --我的lerp也没有呼叫。

#pragma strict

var newScale : Vector3 = Vector3 (0.1,0.1,0.1);

var Grow : Vector3 = Vector3 (1,1,1);
var speed : float =2.0;

function Start () {
  transform.localScale = new Vector3(1F,1F,1F);
}

function Update () {

} 

function OnTriggerEnter (info : Collider) { 

  if(info.tag == "Mani") { 
    transform.localScale =Vector3.Lerp(transform.localScale, newScale, speed * Time.deltaTime/2);
    //transform.localScale = new Vector3(0.3F,0.3F,0.3F);
    Debug.Log("Player hit new cube");
  }

}


function OnTriggerExit (Col : Collider) { 

  if(Col.tag == "Mani") { 
     //    transform.localScale = new Vector3(transform.localScale.x, 1F, transform.localScale.y);
     transform.localScale =Vector3.Lerp(newScale, Grow, speed * Time.deltaTime); //transform.localScale = new Vector3(1F,1F,1F); Debug.Log("Player left cube");
  }

}

Answer 1

你误解了Lerp的工作。lerp本身没有任何动画，它只在两个值之间插入t，其中t在0到1之间。如果t是0时的百分比->，Lerp的结果是第一个值(如果v3在第二个方向上也是0% )，如果t是1时，结果是第二个，如果t是0.5时，结果位于两者的中间，所以如果它的0.25是25% (Slerp基本上是相同的，只是值代表一个旋转，检查维基百科是否有更多的信息)。

但这对你到底意味着什么？

您需要多次调用Lerp，并将其设置为及时到达的位置。一种选择是启动一个协同线，并在玩家进入/退出触发器后，通过(1 / seconds) * Time.deltaTime逐步减少t。

编辑：

将其附加到可见的游戏对象并运行它。它认为它应该澄清Lerp的工作原理。最重要的部分是t。它需要随着时间的推移而减少，才能产生动画效果。

using UnityEngine;

public class LerpExample : MonoBehaviour {

    public Vector3 targetScale = new Vector3(2, 2, 2);
    public float duration = 2;

    Vector3 originalScale;
    float timeFactor;
    float t; 

    void Start() {
        originalScale = transform.localScale;

        //since only values between 0 and 1 will do something
        //we need to know "how much" Time.deltaTime affects our lerping
        //ofc we could calculate it "on the fly", but it stays the same so better store it
        timeFactor = 1 / duration;

        t = 0;
    }

    void Update() {

        //this is just so it repeats over and over
        //if t would grow bigger than 1, it would just be interpreted as 1 by Lerp
        if (t > 1) t -= 1;

        //this is what animates it in the end. each frame (its the update method!) a fraction gets added to t. think of it as percentage.
        t += timeFactor * Time.deltaTime;
        transform.localScale = Vector3.Lerp(originalScale, targetScale, t);

    }
}

edit2:好的，这是在一个协同线中运行的上述内容。不过有个小“陷阱”。我不知道玩家在升级结束前离开扳机的时间。如果他这样做了，那么持续时间是不一致的。例如，如果它的10s，他离开后2s，他将缩小到正常超过10秒，而不是2秒。如果你想修的话，我就让你来解决。

这会影响到扳机

using UnityEngine;

public class Cake : MonoBehaviour {

    public Vector3 targetScale = new Vector3(2, 2, 2);
    public float duration = 2;

    void OnTriggerEnter(Collider other) {
        Alice alice = other.GetComponentInParent<Alice>();
        if (alice == null) return;
        alice.Eat(this);
    }
    void OnTriggerExit(Collider other) {
        Alice alice = other.GetComponentInParent<Alice>();
        if (alice == null) return;
        alice.GrowBackToNormal(this);
    }

}

这会影响进入触发器的对象。

using UnityEngine;
using System.Collections;

public class Alice : MonoBehaviour {

    Vector3 originalScale;
    Coroutine eatAllTheCakeCoroutine;

    void Start() {
        originalScale = transform.localScale;
    }

    IEnumerator ChangeScale(Vector3 targetScale, float duration) {
        Vector3 startScale = transform.localScale;
        float timeFactor = 1 / duration;
        float t = 0;
        while (t < 1) {
            t += timeFactor * Time.deltaTime;
            transform.localScale = Vector3.Lerp(startScale, targetScale, t);
            yield return null;
        }
        transform.localScale = targetScale;
    }

    public void Eat(Cake cake) {
        if (eatAllTheCakeCoroutine != null) StopCoroutine(eatAllTheCakeCoroutine);
        eatAllTheCakeCoroutine = StartCoroutine(ChangeScale(cake.targetScale, cake.duration));

    }
    public void GrowBackToNormal(Cake cake) {
        if(eatAllTheCakeCoroutine != null) StopCoroutine(eatAllTheCakeCoroutine);
        eatAllTheCakeCoroutine = StartCoroutine(ChangeScale(originalScale, cake.duration));
    }
}