用法：先在你的Player里新建一个空的Object重命名为CameraTarget(你起什么名字都行)，然后将脚本拖动到你的Player里，将你新建的 CameraTarget 拖动到脚本的Target属性，运行你就可以看到效果了

1. using UnityEngine;
   
2. using System.Collections;
   
3. 
   
4. public class DragonHillCamera : MonoBehaviour
   
5. {
   
6.     public bool HideAndShowCursor = true;
   
7.     public bool LockRotationWhenRightClick = false;
   
8.     public bool UseBlurEffect = true;
   
9.     public bool UseFogEffect = true;
   
10.     public Transform target;
    
11.    
    
12.     public float targetHeight = 1.0f;
    
13.     public float distance = 5.0f;
    
14. 
    
15.     public float maxDistance = 20;
    
16.     public float minDistance = .6f;
    
17. 
    
18.     public float xSpeed = 250.0f;
    
19.     public float ySpeed = 120.0f;
    
20. 
    
21.     public int yMinLimit = -80;
    
22.     public int yMaxLimit = 80;
    
23. 
    
24.     public int zoomRate = 40;
    
25. 
    
26.     public float rotationDampening = 3.0f;
    
27.     public float zoomDampening = 10.0f;
    
28. 
    
29.     private float x = 0.0f;
    
30.     private float y = 0.0f;
    
31.     private float currentDistance;
    
32.     private float desiredDistance;
    
33.     private float correctedDistance;
    
34.     private bool grounded = false;
    
35. 
    
36.     void Start ()
    
37.     {
    
38.         Screen.lockCursor = true;
    
39.         Vector3 angles = transform.eulerAngles;
    
40.         x = angles.x;
    
41.         y = angles.y;
    
42. 
    
43.         currentDistance = distance;
    
44.         desiredDistance = distance;
    
45.         correctedDistance = distance - 0.2f;
    
46. 
    
47.         // Make the rigid body not change rotation
    
48.         if (rigidbody)
    
49.             rigidbody.freezeRotation = true;
    
50.     }
    
51. 
    
52.     void LateUpdate ()
    
53.     {
    
54.         // Don't do anything if target is not defined
    
55.         if (!target){
    
56.             GameObject go = GameObject.Find("Player");
    
57.             target = go.transform;
    
58.             transform.LookAt(target);
    
59.             return;
    
60.         }
    
61.         // If either mouse buttons are down, let the mouse govern camera position
    
62.         if(LockRotationWhenRightClick== false){
    
63.                 x += Input.GetAxis("Mouse X") * xSpeed * 0.02f;
    
64.                 y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02f;
    
65.             }
    
66.         if (Input.GetMouseButton(0)){
    
67.             if(LockRotationWhenRightClick== false){
    
68.                 x += Input.GetAxis("Mouse X") * xSpeed * 0.02f;
    
69.                 y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02f;
    
70.             }
    
71.         }
    
72.         y = ClampAngle(y, yMinLimit, yMaxLimit);
    
73. 
    
74.         // set camera rotation
    
75.         Quaternion rotation = Quaternion.Euler(y, x, 0);
    
76. 
    
77.         // calculate the desired distance
    
78.         desiredDistance -= Input.GetAxis("Mouse ScrollWheel") * Time.deltaTime * zoomRate * Mathf.Abs(desiredDistance);
    
79.         desiredDistance = Mathf.Clamp(desiredDistance, minDistance, maxDistance);
    
80.         correctedDistance = desiredDistance;
    
81. 
    
82.         // calculate desired camera position
    
83.         Vector3 position = target.position - (rotation * Vector3.forward * desiredDistance + new Vector3(0, -targetHeight, 0));
    
84. 
    
85.         // check for collision using the true target's desired registration point as set by user using height
    
86.         RaycastHit collisionHit;
    
87.         Vector3 trueTargetPosition = new Vector3(target.position.x, target.position.y + targetHeight, target.position.z);
    
88. 
    
89.         // if there was a collision, correct the camera position and calculate the corrected distance
    
90.         bool isCorrected = false;
    
91.         if (Physics.Linecast(trueTargetPosition, position, out collisionHit))
    
92.         {
    
93.             if(collisionHit.transform.name!=target.name){
    
94.                 position = collisionHit.point;
    
95.                 correctedDistance = Vector3.Distance(trueTargetPosition, position);
    
96.                 isCorrected = true;
    
97.             }
    
98.         }
    
99.          
    
100.         // For smoothing, lerp distance only if either distance wasn't corrected, or correctedDistance is more than currentDistance
     
101.         currentDistance = !isCorrected || correctedDistance > currentDistance ? Mathf.Lerp(currentDistance, correctedDistance, Time.deltaTime * zoomDampening) : correctedDistance;
     
102. 
     
103.         // recalculate position based on the new currentDistance
     
104.         position = target.position - (rotation * Vector3.forward * currentDistance + new Vector3(0, -targetHeight - 0.05f, 0));
     
105. 
     
106.         transform.rotation = rotation;
     
107.         transform.position = position;
     
108.          
     
109.     }
     
110. 
     
111.     private static float ClampAngle(float angle, float min, float max)
     
112.     {
     
113.         if (angle < -360)
     
114.             angle += 360;
     
115.         if (angle > 360)
     
116.             angle -= 360;
     
117.         return Mathf.Clamp(angle, min, max);
     
118.     }
     
119. }

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    用法：先在你的Player里新建一个空的Object重命名为CameraTarget(你起什么名字都行)，然后将脚本拖动到你的Player里，将你新建的 CameraTarget 拖动到脚本的Target属性，运行你就可以看到效果了

1. using UnityEngine;
   
2. using System.Collections;
   
3. 
   
4. public class DragonHillCamera : MonoBehaviour
   
5. {
   
6.     public bool HideAndShowCursor = true;
   
7.     public bool LockRotationWhenRightClick = false;
   
8.     public bool UseBlurEffect = true;
   
9.     public bool UseFogEffect = true;
   
10.     public Transform target;
    
11.    
    
12.     public float targetHeight = 1.0f;
    
13.     public float distance = 5.0f;
    
14. 
    
15.     public float maxDistance = 20;
    
16.     public float minDistance = .6f;
    
17. 
    
18.     public float xSpeed = 250.0f;
    
19.     public float ySpeed = 120.0f;
    
20. 
    
21.     public int yMinLimit = -80;
    
22.     public int yMaxLimit = 80;
    
23. 
    
24.     public int zoomRate = 40;
    
25. 
    
26.     public float rotationDampening = 3.0f;
    
27.     public float zoomDampening = 10.0f;
    
28. 
    
29.     private float x = 0.0f;
    
30.     private float y = 0.0f;
    
31.     private float currentDistance;
    
32.     private float desiredDistance;
    
33.     private float correctedDistance;
    
34.     private bool grounded = false;
    
35. 
    
36.     void Start ()
    
37.     {
    
38.         Screen.lockCursor = true;
    
39.         Vector3 angles = transform.eulerAngles;
    
40.         x = angles.x;
    
41.         y = angles.y;
    
42. 
    
43.         currentDistance = distance;
    
44.         desiredDistance = distance;
    
45.         correctedDistance = distance - 0.2f;
    
46. 
    
47.         // Make the rigid body not change rotation
    
48.         if (rigidbody)
    
49.             rigidbody.freezeRotation = true;
    
50.     }
    
51. 
    
52.     void LateUpdate ()
    
53.     {
    
54.         // Don't do anything if target is not defined
    
55.         if (!target){
    
56.             GameObject go = GameObject.Find("Player");
    
57.             target = go.transform;
    
58.             transform.LookAt(target);
    
59.             return;
    
60.         }
    
61.         // If either mouse buttons are down, let the mouse govern camera position
    
62.         if(LockRotationWhenRightClick== false){
    
63.                 x += Input.GetAxis("Mouse X") * xSpeed * 0.02f;
    
64.                 y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02f;
    
65.             }
    
66.         if (Input.GetMouseButton(0)){
    
67.             if(LockRotationWhenRightClick== false){
    
68.                 x += Input.GetAxis("Mouse X") * xSpeed * 0.02f;
    
69.                 y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02f;
    
70.             }
    
71.         }
    
72.         y = ClampAngle(y, yMinLimit, yMaxLimit);
    
73. 
    
74.         // set camera rotation
    
75.         Quaternion rotation = Quaternion.Euler(y, x, 0);
    
76. 
    
77.         // calculate the desired distance
    
78.         desiredDistance -= Input.GetAxis("Mouse ScrollWheel") * Time.deltaTime * zoomRate * Mathf.Abs(desiredDistance);
    
79.         desiredDistance = Mathf.Clamp(desiredDistance, minDistance, maxDistance);
    
80.         correctedDistance = desiredDistance;
    
81. 
    
82.         // calculate desired camera position
    
83.         Vector3 position = target.position - (rotation * Vector3.forward * desiredDistance + new Vector3(0, -targetHeight, 0));
    
84. 
    
85.         // check for collision using the true target's desired registration point as set by user using height
    
86.         RaycastHit collisionHit;
    
87.         Vector3 trueTargetPosition = new Vector3(target.position.x, target.position.y + targetHeight, target.position.z);
    
88. 
    
89.         // if there was a collision, correct the camera position and calculate the corrected distance
    
90.         bool isCorrected = false;
    
91.         if (Physics.Linecast(trueTargetPosition, position, out collisionHit))
    
92.         {
    
93.             if(collisionHit.transform.name!=target.name){
    
94.                 position = collisionHit.point;
    
95.                 correctedDistance = Vector3.Distance(trueTargetPosition, position);
    
96.                 isCorrected = true;
    
97.             }
    
98.         }
    
99.          
    
100.         // For smoothing, lerp distance only if either distance wasn't corrected, or correctedDistance is more than currentDistance
     
101.         currentDistance = !isCorrected || correctedDistance > currentDistance ? Mathf.Lerp(currentDistance, correctedDistance, Time.deltaTime * zoomDampening) : correctedDistance;
     
102. 
     
103.         // recalculate position based on the new currentDistance
     
104.         position = target.position - (rotation * Vector3.forward * currentDistance + new Vector3(0, -targetHeight - 0.05f, 0));
     
105. 
     
106.         transform.rotation = rotation;
     
107.         transform.position = position;
     
108.          
     
109.     }
     
110. 
     
111.     private static float ClampAngle(float angle, float min, float max)
     
112.     {
     
113.         if (angle < -360)
     
114.             angle += 360;
     
115.         if (angle > 360)
     
116.             angle -= 360;
     
117.         return Mathf.Clamp(angle, min, max);
     
118.     }
     
119. }

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