Quaternion中的LookRotation方法--面向敌人

Quaternion.LookRotation

public static Quaternion LookRotation(Vector3 forward,Vector3 upwards = Vector3.up);

Description:

Creates a rotation with the specified forward and upwards directions.

Returns the computed quaternion. If used to orient a Transform, the Z axis will be aligned with forward/and the Y axis with upwards if these vectors are orthogonal. Logs an error if the forward direction is zero.

例子：

using UnityEngine;
using System.Collections;
/*
* 
*/
public class ExampleClass : MonoBehaviour {
     pullic Transform player;
    public Transform target;
    void Update() {
          Vector3 relativePos = target.position - player.position;
          //relativePos.y = 0;//player物体朝向target物体时默认y轴会有倾斜，如果不想倾斜，可设置y轴坐标为0
          player.rotation = Quaternion.LookRotation(relativePos);
    }
}

**仅仅使用Quaternion中的LookRotation方法，可以使当前物体在一瞬间就朝向目标物体。假使要物体慢慢旋转朝向目标物体，就需要再加上插值运算：

Quaternion.Lerp或者Quaternion.Slerp

代码例子：

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    pullic Transform player;
    public Transform target;
    public float speed = 5.0f;
    
    void Update() {
        Vector3 relativePos = target.position - player.position;
        Quaternion targetRotation = Quaternion.LookRotation(relativePos);
        player.rotation = Quaternion.Lerp(player.rotation, targetRotation, Time.time * speed);//物体想慢慢朝向目标
        
        player.position = Quaternion.Lerp(player.position, target.position, Time.time * speed);//物体慢慢到达目标位置
    }
}