U3D中摄像机绕屏幕中心点旋转缩放平移(转载)

刀锋狼

之前做的都是摄像机绕某个物体旋转。直接修改的Rotation属性然后缩放用的是改摄像机FieldOfView的值最后发觉效果不仅不尽如人意而且平移后会错位。在借鉴了一个别人的摄像机代码后修改成功按住右键旋转，按住中键平移，滚轮缩放脚本拖放到摄像机上即可代码如下

1. using UnityEngine;
   
2. using System.Collections;
   
3. 
   
4. public class FreeCameraController : MonoBehaviour {
   
5.     //摄像机绕屏幕中心旋转缩放平移脚本
   
6. 
   
7.     public float thetaSpeed = 250.0f;
   
8.     public float phiSpeed = 120.0f;
   
9.     public float moveSpeed = 10.0f;
   
10.     public float zoomSpeed = 30.0f;
    
11. 
    
12.     public float phiBoundMin = -89f;
    
13.     public float phiBoundMax = 89f;
    
14.     public bool useMoveBounds = true;
    
15.     public float moveBounds = 100f;
    
16. 
    
17.     public float rotateSmoothing = 0.5f;
    
18.     public float moveSmoothing = 0.7f;
    
19. 
    
20.     public float distance = 2.0f;
    
21.     private Vector2 euler;
    
22. 
    
23.     private Quaternion targetRot;
    
24.     private Vector3 targetLookAt;
    
25.     private float targetDist;
    
26.     private Vector3 distanceVec = new Vector3(0, 0, 0);
    
27. 
    
28.     private Transform target;
    
29.     private Rect inputBounds;
    
30.     public Rect paramInputBounds = new Rect(0, 0, 1, 1);
    
31. 
    
32.     public Vector3 pivotPoint = new Vector3(0, 2, 0);
    
33. 
    
34.     public void Start()
    
35.     {
    
36.         Vector3 angles = transform.eulerAngles;        //获取摄像机欧拉角
    
37.         euler.x = angles.y;       
    
38.         euler.y = angles.x;
    
39.         //unity only returns positive euler angles but we need them in -90 to 90
    
40.         euler.y = Mathf.Repeat(euler.y + 180f, 360f) - 180f;
    
41. 
    
42.         GameObject go = new GameObject("_FreeCameraTarget");
    
43.         go.hideFlags = HideFlags.HideAndDontSave | HideFlags.HideInInspector;
    
44.         target = go.transform;
    
45. 
    
46.         
    
47.         target.position = pivotPoint;
    
48.         targetDist = (transform.position - target.position).magnitude;
    
49.         
    
50.         targetRot = transform.rotation;
    
51.         targetLookAt = target.position;
    
52.     }
    
53. 
    
54.     public void Update()
    
55.     {
    
56.         //NOTE: mouse coordinates have a bottom-left origin, camera top-left
    
57.         inputBounds.x = GetComponent<Camera>().pixelWidth * paramInputBounds.x;
    
58.         inputBounds.y = GetComponent<Camera>().pixelHeight * paramInputBounds.y;
    
59.         inputBounds.width = GetComponent<Camera>().pixelWidth * paramInputBounds.width;
    
60.         inputBounds.height = GetComponent<Camera>().pixelHeight * paramInputBounds.height;
    
61. 
    
62.         if (target && inputBounds.Contains(Input.mousePosition))
    
63.         {
    
64.             float dx = Input.GetAxis("Mouse X");
    
65.             float dy = Input.GetAxis("Mouse Y");
    
66. 
    
67.             bool click1 = Input.GetMouseButton(1);
    
68.             bool click2 = Input.GetMouseButton(2);
    
69. 
    
70. 
    
71.             if (click2)                //按下鼠标中键，改变摄像机观察中心点位置
    
72.             {
    
73.                 dx = dx * moveSpeed * 0.005f * targetDist;
    
74.                 dy = dy * moveSpeed * 0.005f * targetDist;
    
75.                 targetLookAt -= transform.up * dy + transform.right * dx;
    
76.                 if (useMoveBounds)
    
77.                 {
    
78.                     targetLookAt.x = Mathf.Clamp(targetLookAt.x, -moveBounds, moveBounds);
    
79.                     targetLookAt.y = Mathf.Clamp(targetLookAt.y, -moveBounds, moveBounds);
    
80.                     targetLookAt.z = Mathf.Clamp(targetLookAt.z, -moveBounds, moveBounds);
    
81.                 }
    
82.             }
    
83. 
    
84.             else if (click1)        //按下鼠标右键旋转
    
85.             {
    
86.                 dx = dx * thetaSpeed * 0.02f;
    
87.                 dy = dy * phiSpeed * 0.02f;
    
88.                 euler.x += dx;
    
89.                 euler.y -= dy;
    
90.                 euler.y = ClampAngle(euler.y, phiBoundMin, phiBoundMax);
    
91.                 targetRot = Quaternion.Euler(euler.y, euler.x, 0);
    
92.             }
    
93. 
    
94.             targetDist -= Input.GetAxis("Mouse ScrollWheel") * zoomSpeed * 0.5f;
    
95.             targetDist = Mathf.Max(0.1f, targetDist);
    
96.         }
    
97.     }
    
98. 
    
99.     public void FixedUpdate()        //每帧根据摄像机中线点位置不同重新定位摄像机的旋转和坐标
    
100.     {
     
101.         distance = moveSmoothing * targetDist + (1 - moveSmoothing) * distance;
     
102. 
     
103.         transform.rotation = Quaternion.Slerp(transform.rotation, targetRot, rotateSmoothing);
     
104.         target.position = Vector3.Lerp(target.position, targetLookAt, moveSmoothing);
     
105.         distanceVec.z = distance;
     
106.         transform.position = target.position - transform.rotation * distanceVec;
     
107.     }
     
108. 
     
109.     static float ClampAngle(float angle, float min, float max)        //控制旋转角度不超过360
     
110.     {
     
111.         if (angle < -360f) angle += 360f;
     
112.         if (angle > 360f) angle -= 360f;
     
113.         return Mathf.Clamp(angle, min, max);
     
114.     }
     
115. }

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