Unity3D实现控制摄像机移动

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
//巡游模式摄像机控制
public class CameraMove : MonoBehaviour
{
 
  public static CameraMove Instance = null;
  
  private Vector3 dirVector3;
  private Vector3 rotaVector3;
  private float paramater = 0.1f;
  //旋转参数
  private float xspeed = -0.05f;
  private float yspeed = 0.1f;
 
 private float dis;
 
  void Awake ()
 {
   Instance = this;
 }
 
  private void Start()
  {
    rotaVector3 = transform.localEulerAngles;
 dis = UIFuc.Instance.Dis;
  }
 
  // Update is called once per frame
 void FixedUpdate ()
  {
    //旋转
    if (Input.GetMouseButton(1))
    {
      rotaVector3.y += Input.GetAxis("Horizontal") * yspeed;
      rotaVector3.x += Input.GetAxis("Vertical") * xspeed;
      transform.rotation = Quaternion.Euler(rotaVector3);
    }
 
    //移动
    dirVector3 =Vector3.zero;
 
    if (Input.GetKey(KeyCode.W))
    {
      if(Input.GetKey(KeyCode.LeftShift)) dirVector3.z = 3;
      else dirVector3.z = 1;
    }
    if (Input.GetKey(KeyCode.S))
    {
      if (Input.GetKey(KeyCode.LeftShift)) dirVector3.z = -3;
      else dirVector3.z = -1;
    }
    if (Input.GetKey(KeyCode.A))
    {
      if (Input.GetKey(KeyCode.LeftShift)) dirVector3.x = -3;
      else dirVector3.x = -1;
    }
    if (Input.GetKey(KeyCode.D))
    {
      if (Input.GetKey(KeyCode.LeftShift)) dirVector3.x = 3;
      else dirVector3.x = 1;
    }
    if (Input.GetKey(KeyCode.Q))
    {
      if (Input.GetKey(KeyCode.LeftShift)) dirVector3.y = -3;
      else dirVector3.y = -1;
    }
    if (Input.GetKey(KeyCode.E))
    {
      if (Input.GetKey(KeyCode.LeftShift)) dirVector3.y = 3;
      else dirVector3.y = 1;
    }
    transform.Translate(dirVector3 * paramater,Space.Self);
    //限制摄像机范围
 transform.position = Vector3.ClampMagnitude(transform.position, dis);
  }
}