四元数相乘
#region 四元数相乘
Quaternion q = Quaternion.AngleAxis(20, Vector3.up);
this.transform.rotation *= q;
#endregion四元数乘向量
Vector3 v = Vector3.forward;
print(v);
//四元数乘向量的顺序不能改变，也就是说不能用向量去乘四元数，只能是四元数乘向量
v = Quaternion.AngleAxis(45,Vector3.up) * v;
print(v);
v = Quaternion.AngleAxis(45, Vector3.up) * v;
print(v);例一
模拟飞机发射不同类型子弹的方法，单发，双发，扇形，环形
using System.Collections;
using System.Collections.Generic;
using UnityEngine;public enum E_FireType
{One,Two,Three,Round
}
public class AirPlane : MonoBehaviour
{private E_FireType nowType;public GameObject bullet;public int roundNum = 4;// Start is called before the first frame updatevoid Start(){nowType = E_FireType.One;}// Update is called once per framevoid Update(){//切换开火方式if (Input.GetKeyDown(KeyCode.Alpha1)){nowType = E_FireType.One;}else if (Input.GetKeyDown(KeyCode.Alpha2)){nowType = E_FireType.Two;}else if (Input.GetKeyDown(KeyCode.Alpha3)){nowType = E_FireType.Three;}else if (Input.GetKeyDown(KeyCode.Alpha4)){nowType = E_FireType.Round;}if(Input.GetKeyDown(KeyCode.Space)){Fire();}}private void Fire(){switch (nowType){case E_FireType.One:Instantiate(bullet,transform.position,transform.rotation);break;case E_FireType.Two://让发射位置分别向两边的方向偏移一点Instantiate(bullet, transform.position - transform.right * 1, transform.rotation);Instantiate(bullet, transform.position + transform.right * 1, transform.rotation);break;case E_FireType.Three:Instantiate(bullet, transform.position, transform.rotation);Instantiate(bullet, transform.position - transform.right * 1, transform.rotation * Quaternion.AngleAxis(-20, Vector3.up));Instantiate(bullet, transform.position + transform.right * 1, transform.rotation * Quaternion.AngleAxis(20, Vector3.up));break;case E_FireType.Round:float angle = 360/roundNum;for(int i = 0; i < roundNum; i++){Instantiate(bullet, this.transform.position, this.transform.rotation * Quaternion.AngleAxis(i * angle, Vector3.up));}break;}}
}
练习二
用3D数学知识实现摄像机跟随效果
1.摄像机在人物斜后方，通过角度控制倾斜率
2.通过鼠标滚轮控制摄像机距离人物的距离（有最大最小限制）
3.摄像机看向任务头顶上方的一个位置（可调节）
4.Vector3.Lerp实现相机跟随任务
5.Quaternion.Slerp实现摄像机看向人物
using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class CameraMove2 : MonoBehaviour
{//目标对象public Transform target;//相对头顶偏移多少public float headOffsetH = 1;//倾斜角度public float angle = 45;//默认的摄像机里观测点的距离public float dis = 5;//距离必须是3和10之间 public float minDis = 3;public float maxDis = 10;//当前摄像机应该在的位置private Vector3 nowPos;private Vector3 nowDir;private float time;private Vector3 startPos;private Vector3 endPos;// Start is called before the first frame updatevoid Start(){}// Update is called once per framevoid Update(){//鼠标中键滚动控制摄像机远近的逻辑dis += Input.GetAxis("Mouse ScrollWheel");dis = Mathf.Clamp(dis, minDis, maxDis);//向头顶偏移位置nowPos = target.position + target.up * headOffsetH;//往后方偏移位置 nowDir = Quaternion.AngleAxis(angle, target.right) * -target.forward;nowPos = nowPos + nowDir * dis;//直接把算出来的位置赋值if(endPos != nowPos) { startPos = this.transform.position;endPos = nowPos;time = 0;}time += Time.deltaTime;//this.transform.position = nowPos;//先快后慢//this.transform.position = Vector3.Lerp(this.transform.position,nowPos,Time.deltaTime*dis);//匀速this.transform.position = Vector3.Lerp(startPos, endPos, time);Quaternion.LookRotation(nowDir);this.transform.rotation = Quaternion.Slerp(this.transform.rotation, Quaternion.LookRotation(-nowDir),Time.deltaTime);}
}
)
