unity 常用的几种相机跟随

固定相机跟随

这种相机有一个参考对象，它会保持与该参考对象固定的位置，跟随改参考对象发生移动

 using UnityEngine;
 using System.Collections;

 public class CameraFlow : MonoBehaviour
 {
     public Transform target;
     private Vector3 offset;
     // Use this for initialization
     void Start()
     {
         offset = target.position - this.transform.position;

     }

     // Update is called once per frame
     void Update()
     {
         this.transform.position = target.position - offset;
     }
 }

固定相机跟随，带有角度旋转

这一种相机跟随是对第一种相机跟随的改进，在原有基础上面，添加了跟随角度的控制

 using UnityEngine;
 using System.Collections;

 public class CameriaTrack : MonoBehaviour {
     private Vector3 offset = new Vector3(,,);//相机相对于玩家的位置
     private Transform target;
     private Vector3 pos;

     public float speed = ;

     // Use this for initialization
     void Start () {
         target = GameObject.FindGameObjectWithTag("Player").transform;

     }

     // Update is called once per frame
     void Update () {
         pos = target.position + offset;
         this.transform.position = Vector3.Lerp(this.transform.position, pos, speed*Time.deltaTime);//调整相机与玩家之间的距离
         Quaternion angel = Quaternion.LookRotation(target.position - this.transform.position);//获取旋转角度
         this.transform.rotation = Quaternion.Slerp(this.transform.rotation, angel, speed * Time.deltaTime);

     }
 }

第三人称相机

这种相机跟随，是第三人称角度看向对象的，也就是一直看向对象的后面，如一直显示玩家的后背

 using UnityEngine;
 using System.Collections;
 //相机一直拍摄主角的后背
 public class CameraFlow : MonoBehaviour {

     public Transform target;

     public float distanceUp=15f;
     public float distanceAway = 10f;
     public float smooth = 2f;//位置平滑移动值
     public float camDepthSmooth = 5f;
     // Use this for initialization
     void Start () {

     }

     // Update is called once per frame
     void Update () {
        // 鼠标轴控制相机的远近
         if ((Input.mouseScrollDelta.y <  && Camera.main.fieldOfView >= ) || Input.mouseScrollDelta.y >  && Camera.main.fieldOfView <= )
         {
             Camera.main.fieldOfView += Input.mouseScrollDelta.y * camDepthSmooth * Time.deltaTime;
         }

     }

     void LateUpdate()
     {
        //相机的位置
         Vector3 disPos = target.position + Vector3.up * distanceUp - target.forward * distanceAway;
         transform.position=Vector3.Lerp(transform.position,disPos,Time.deltaTime*smooth);
         //相机的角度
         transform.LookAt(target.position);
     }

 }

相机跟随，鼠标控制移动和缩放

相机与观察对象保持一定距离，可以通过鼠标进行上下左右旋转，通过鼠标滚轮进行放大和缩小操作

 using UnityEngine;
 using System.Collections;

 public class CameraFlow : MonoBehaviour
 {
     public Transform target;
     Vector3 offset;
     // Use this for initialization
     void Start()
     {
         offset = transform.position - target.position;
     }

     // Update is called once per frame
     void Update()
     {
         transform.position = target.position + offset;
         Rotate();
         Scale();
     }
     //缩放
     private void Scale()
     {
         float dis = offset.magnitude;
         dis += Input.GetAxis("Mouse ScrollWheel") * ;
         Debug.Log("dis=" + dis);
         if (dis <  || dis > )
         {
             return;
         }
         offset = offset.normalized * dis;
     }
     //左右上下移动
     private void Rotate()
     {
         if (Input.GetMouseButton())
         {
             Vector3 pos = transform.position;
             Vector3 rot = transform.eulerAngles;

             //围绕原点旋转，也可以将Vector3.zero改为 target.position,就是围绕观察对象旋转
             transform.RotateAround(Vector3.zero, Vector3.up, Input.GetAxis("Mouse X") * );
             transform.RotateAround(Vector3.zero, Vector3.left, Input.GetAxis("Mouse Y") * );
             float x = transform.eulerAngles.x;
             float y = transform.eulerAngles.y;
             Debug.Log("x=" + x);
             Debug.Log("y=" + y);
             //控制移动范围
             if (x <  || x >  || y <  || y > )
             {
                 transform.position = pos;
                 transform.eulerAngles = rot;
             }
             //  更新相对差值
             offset = transform.position - target.position;
         }

     }
 }

转载：http://blog.csdn.net/u011484013/article/details/51554745