Unity3D开发之控制摄像机围绕物体旋转 平移 缩放

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Unity3D开发之控制摄像机围绕物体旋转 平移 缩放

这个功能太常用了。做三维模型展示的时候这是必备。旋转我用到的是四元数来控制。至于为什么，我觉得这种方式控制更平滑。忽略其他没用的变量和代码。下面项目中的代码：

//常用开发脚本
//控制摄像机绕着某物体旋转  以及缩放相关功能public class MouseController : MonoBehaviour
{//绕此点旋转public Transform PoinTransform;public Transform centerGameObject;//旋转参数private float xspeed = -0.2f;private float yspeed = 0.2f;private float _viewSpeed = 10;//z值控制摄像机和中心点的距离private Vector3 posVector3=new Vector3(0,0,-15);[HideInInspector]public Vector3 rota;//_time秒无操作后模型将开始旋转观察模式private float _time;//鼠标滚轮值private float swValue;private Vector3 mForward;private void Start(){centerGameObject.position = PoinTransform.position;//设置初始摄像机的角度和位置rota.x = 30f;Quaternion q = Quaternion.Euler(rota);transform.position = q * posVector3 + centerGameObject.transform.position;transform.rotation = q;}private void OnEnable(){_time = 0;}// Update is called once per frameprivate void Update(){if (UIFuc.Instance.mCameraMode == CameraMode.XunyouMode) return;#region//鼠标控制模型旋转swValue = Input.GetAxis("Mouse ScrollWheel");//右键鼠标旋转时camera位置信息更新|| 同时按住CTRL加鼠标右键if (Input.GetMouseButton(1) || (Input.GetMouseButton(0) && Input.GetKey(KeyCode.LeftControl))){posVector3=new Vector3(0,0,-Vector3.Distance(transform.position,centerGameObject.position));rota.y += Input.GetAxis("Horizontal")*yspeed;rota.x += Input.GetAxis("Vertical")*xspeed;rota.x = Mathf.Clamp(rota.x, 0, 90);Quaternion q = Quaternion.Euler(rota);transform.position = q*posVector3 + centerGameObject.position;transform.rotation = q;_time = 0;Globle._cameraState=CameraState.rotate;}else if (swValue != 0)//向上滚动是正值{if (EventSystem.current.IsPointerOverGameObject()) return;if (Vector3.Distance(transform.position, centerGameObject.position)<0.8f&&swValue>0) return;if (Vector3.Distance(transform.position, centerGameObject.position) > 15f && swValue < 0) return;mForward = centerGameObject.position - Camera.main.transform.position;transform.position += mForward*swValue;_time = 0;Globle._cameraState = CameraState.rotate;}else if (Input.GetMouseButton(2)){Vector3 moveDir = (Input.GetAxis("Horizontal") * -transform.right+ Input.GetAxis("Vertical")*-transform.up) * 0.05f;centerGameObject.position += moveDir;transform.position += moveDir;_time = 0;}else{Globle._cameraState = CameraState.none;}_time += Time.deltaTime;if (_time > 5){rota.y -= Time.deltaTime*10;Quaternion p = Quaternion.Euler(rota);transform.position = p*posVector3 + centerGameObject.position;transform.rotation = p;}#endregion}

还有控制摄像机视野平移的代码，是我用的比较简单的一个方法。有缺点，就是平移不是特别顺滑。后来看到一个插件的源码，找到了另一个更好更平滑更满意的实现方式。

//中键平移参数private float kPara=0.05f;private Vector2 MouseOffsetSincePreviousFrame;private Vector2 currentScreenPos ;private Vector2 previousScreenPos;
else if(Input.GetMouseButtonDown(2)){previousScreenPos=Input.mousePosition;}else if (Input.GetMouseButton(2)){currentScreenPos=Input.mousePosition;MouseOffsetSincePreviousFrame=currentScreenPos-previousScreenPos;transform.position+=(MouseOffsetSincePreviousFrame.x*-transform.right+MouseOffsetSincePreviousFrame.y*-transform.up)*kPara;previousScreenPos=currentScreenPos;return;}

效果很棒。希望本博客对你有帮助。