直接掛載到模型上

using UnityEngine; using System.Collections;public class OnDrag : MonoBehaviour {//目標(biāo)物體public Transform target;private int MouseWheelSensitivity = 1; //放大倍數(shù)的快慢private int MouseZoomMin = 1; //最小倍數(shù)private int MouseZoomMax = 5; //最大倍數(shù)//默認(rèn)距離private float normalDistance = 3;private Vector3 normalized;//拖拽的移動(dòng)速度private float xSpeed = 250.0f;private float ySpeed = 120.0f;//拖拽的高度限制private int yMinLimit = -20;private int yMaxLimit = 80;//角度private float x = 0.0f;private float y = 0.0f;//記錄目標(biāo)物體的坐標(biāo)private Vector3 screenPoint;private Vector3 offset;//圍繞x旋轉(zhuǎn)30°private Quaternion rotation = Quaternion.Euler(new Vector3(30f, 0f, 0f));//目標(biāo)的3D坐標(biāo)private Vector3 CameraTarget;//打印歐拉角:繞各個(gè)軸旋轉(zhuǎn)的角度，順時(shí)針為正方向public void Awake(){target = transform;print(transform.eulerAngles.x);print(transform.eulerAngles.y);print(transform.eulerAngles.z);}void Start(){//找到目標(biāo)飛機(jī)的3d坐標(biāo)CameraTarget = target.position;//目標(biāo)飛機(jī)的z-3，距離攝像機(jī)更近了float z = target.transform.position.z - normalDistance;//給當(dāng)前相機(jī)給定位，現(xiàn)在的3D坐標(biāo)乘以30°transform.position = rotation * new Vector3(transform.position.x, transform.position.y, z);//將視角轉(zhuǎn)向物體transform.LookAt(target);//記錄各個(gè)軸偏離的角度var angles = transform.eulerAngles;x = angles.y;y = angles.x;}void OnGUI(){GUI.Label(new Rect(10, 10, 300, 30), "左擊:旋轉(zhuǎn)；滾輪：縮放；中擊：拖拽");}void Update(){//如果左擊了，旋轉(zhuǎn)if (Input.GetMouseButton(0)){x += Input.GetAxis("Mouse X") * xSpeed * 0.02f;y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02f;y = ClampAngle(y, yMinLimit, yMaxLimit);var rotation = Quaternion.Euler(y, x, 0);var position = rotation * new Vector3(0.0f, 0.0f, -normalDistance) + CameraTarget;transform.rotation = rotation;transform.position = position;}//滾輪縮放else if (Input.GetAxis("Mouse ScrollWheel") != 0){//攝像機(jī)3d坐標(biāo)-物體的3d坐標(biāo)normalized = (transform.position - CameraTarget).normalized;if (normalDistance >= MouseZoomMin && normalDistance <= MouseZoomMax){normalDistance -= Input.GetAxis("Mouse ScrollWheel") * MouseWheelSensitivity;}if (normalDistance < MouseZoomMin){normalDistance = MouseZoomMin;}if (normalDistance > MouseZoomMax){normalDistance = MouseZoomMax;}//改變攝像機(jī)的遠(yuǎn)近transform.position = normalized * normalDistance;}//案件按下 記錄鼠標(biāo)的else if (Input.GetMouseButtonDown(2)){//將目標(biāo)物體的坐標(biāo)轉(zhuǎn)化成平面坐標(biāo)screenPoint = Camera.main.WorldToScreenPoint(target.transform.position);//計(jì)算鼠標(biāo)的3維坐標(biāo)跟物體的3維坐標(biāo)的差值offset = target.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));}//中鍵拖拽，改變飛機(jī)的坐標(biāo)，每幀調(diào)用if (Input.GetMouseButton(2)){//鼠標(biāo)的平面坐標(biāo)Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);//鼠標(biāo)轉(zhuǎn)移的3d空間坐標(biāo)值Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;//改變鼠標(biāo)的3D空間坐標(biāo)target.transform.position = curPosition;}//朝向，每動(dòng)一幀都要改變朝向transform.LookAt(CameraTarget);}//控制旋轉(zhuǎn)的角度，如果旋轉(zhuǎn)的角度大于360或者小于360都要加上或者減去對應(yīng)的角度static float ClampAngle(float angle, float min, float max){if (angle < -360)angle += 360;if (angle > 360)angle -= 360;return Mathf.Clamp(angle, min, max);} }

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