四元数API

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

public class QuaternionAPI : MonoBehaviour
{
public Transform tf;
public AnimationCurve a;
private float x;
四元数*向量：表示对向量做旋转变化
//2D视图3D物体前方朝向鼠标位置
private void Rotext()
{
Vector3 fdir = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;
float rotY = Mathf.Atan2(fdir.x, fdir.y) * Mathf.Rad2Deg;
//采用四元数设置旋转角度：先在世界x轴旋转-90的在*得加世界z轴目标旋转值
transform.rotation = Quaternion.AngleAxis(-90, Vector3.right) * Quaternion.AngleAxis(-rotY, Vector3.up);
}

private void OnGUI()
{
    if (GUILayout.Button (""))
    {
        //1.欧拉角转换为四元数
        //Quaternion.Euler(欧拉角);

        //2/四元数转欧拉角
        Quaternion qt = this.transform.rotation;
        Vector3 auler = qt.eulerAngles;

        //3.轴/角
        //Quaternion.Euler(0, 50, 0);
        this .transform .rotation = Quaternion.AngleAxis(50, Vector3.up);

    }
    
    if (GUILayout.Button("LookRotation"))
    {
        //4.注视旋转
        //Z轴指向一个方向
        //当前物体注视 tf 旋转
        Vector3 dir = tf.position - this.transform.position;
        this.transform.rotation  = Quaternion.LookRotation (dir);
        //this.transform.LookAt(tf);//效果与上两行代码相同----下一帧立即执行

    }

    if (GUILayout.RepeatButton("LookRotationLerp"))
    {
        //5.插值旋转
        x += Time.deltaTime;
        Quaternion dir = Quaternion.LookRotation(tf.position - this.transform.position);            
        this .transform .rotation = Quaternion.Lerp(this.transform.rotation, dir, a.Evaluate (x));

        //6.匀速旋转
        //this.transform.rotation = Quaternion.RotateTowards(this.transform.rotation, dir, 0.1f);//匀速朝向旋转
    }

    if (GUILayout.RepeatButton("AngleR90"))
    {
        Quaternion dir = Quaternion.Euler(0, 90, 0);
        this.transform.rotation =
            Quaternion.Lerp(this.transform.rotation, dir, 0.1f);
        //7.如果当前旋转角度 接近目标旋转角度
        if (Quaternion .Angle (this .transform .rotation ,dir )<10)
        {
            this.transform.rotation = dir;
        }
    }

    if (GUILayout.RepeatButton("Right"))
    {
        //8.x轴注视旋转 t1
        //this.transform.right = tf.position - this.transform.position;
        //x正方向---注视目标物体方向
        Quaternion dir = Quaternion.FromToRotation(Vector3 .right  , tf.position - this.transform.position);
        //this.transform.rotation = dir;
        this.transform.rotation = Quaternion.Lerp(this.transform.rotation, dir, 0.1f);


    }
}

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

}

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向量API