FixUpdate是放物理组件的，像RigidBody添加力等等
LateUpdate放相机的逻辑
Quaternion.identity是Quaternion(0,0,0,0) 旋转的初始角
UnityEngine.Random.Range();的随机数值是左闭右开的，例求2~4之间的整数随机数：int a = UnityEngine.Random.Range(2,4+1);
相机移动实例：
脚本挂在Main Camera上
public Transform y_Axis;
public Transform x_Axis;
public Transform z_Axis;
public Transform zoom_Axis;
// 跟随的玩家
public Transform player;
// 鼠标的左右，上下偏移量
private float ver,hor;
//旋转速度
public float roSpeed= 180;
private float x;
// 是否跟随玩家
public bool isFollow;
// 是否旋转玩家
public bool isTurn;
// 只放相机的逻辑
private void LateUpdate()
{
hor = Input.GetAxis("Mouse X");
ver = Input.GetAxis("Mouse Y");
// 左右
if (hor !=0)
{
y_Axis.Rotate(Vector3.up * hor * Time.deltaTime * roSpeed,Space.World);
}
// 上下
if (ver!= 0)
{
x += -ver * Time.deltaTime * roSpeed;
x = Mathf.Clamp(x, -20, 45);
Quaternion q = Quaternion.identity;
q = Quaternion.Euler(x, x_Axis.transform.eulerAngles.y, x_Axis.transform.eulerAngles.z);
x_Axis.rotation = Quaternion.Lerp(x_Axis.rotation, q, Time.deltaTime * roSpeed);
// x_Axis.Rotate(transform.right*ver*Time.deltaTime*roSpeed,Space.World);
}
// 旋转玩家
if (player !=null &&isTurn)
{
player.transform.forward = new Vector3(transform.forward.x,0,transform.forward.z);
}
// 跟随玩家
if (player!=null &&isFollow )
{
y_Axis.position = Vector3.Lerp(y_Axis.position, player.position, Time.deltaTime * 10f);
}
}
