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最近在做一款VR项目，有一个查看功能，分为自由查看和跟随查看。
自由查看：
第一人称自由控制查看。使用firstPersonControl即可。
跟随查看：
摄像机可自由旋转并跟随查看的物体移动（摄像机不可为子物体）。
刚开始使用固定坐标的方法，但摄像机无法自由旋转。后来换用rotatearound，可以自由旋转，可一旦物体移动，旋转半径会拉大。
最后，模仿手势插件写了一个方法，代码如下：
public Transform target;
public float minDistance = 1.5f;
public float maxDistance = 10.0f;
public float yawSensitivity =30f;
public float pinchSensitivity = 5.0f;
public float smoothZoomSpeed = 30.0f;
public float smoothOrbitSpeed = 10.0f;
float distance = 5.0f;
float yaw = ;
float pitch = ;
float idealDistance = ;
bool rotate;
public float IdealDistance
{
get { return idealDistance; }
set { idealDistance = Mathf.Clamp( value, minDistance, maxDistance ); }
}
public float Yaw
{
get { return yaw; }
}
void Start()
{
Vector3 angles = transform.eulerAngles;
distance = IdealDistance = 5f;
yaw = angles.y;
pitch = ;
UpdateCamera();
}
void Update()
{
if (Input.GetMouseButtonDown ())
rotate = true;
if (Input.GetMouseButtonUp ())
rotate = false;
if( rotate )
{
yaw += Input.GetAxis ("Mouse X") * yawSensitivity;
pitch -= Input.GetAxis ("Mouse Y") *pinchSensitivity;
}
IdealDistance -= Mathf.Lerp (, Input.GetAxis ("Mouse ScrollWheel") * smoothZoomSpeed, Time.deltaTime);
IdealDistance = Mathf.Clamp (IdealDistance, minDistance, maxDistance);
}
void LateUpdate()
{
UpdateCamera ();
}
void UpdateCamera()
{
distance = Mathf.Lerp (distance, IdealDistance, Time.deltaTime * smoothZoomSpeed);
Vector3 lookAtPos = target.position;
Quaternion rotaetAngle = Quaternion.Euler (pitch, yaw, );
Vector3 desiredPos = lookAtPos - rotaetAngle * new Vector3 (, , distance);
transform.position = desiredPos;
transform.rotation = rotaetAngle;
transform.LookAt (target);
}
static float ClampAngle( float angle, float min, float max )
{
if( angle < - )
angle += ;
if( angle > )
angle -= ;
return Mathf.Clamp( angle, min, max );
}以上，完美实现摄像机跟随，并可以右键旋转，滚轮拉近功能。