unity 点击鼠标左键控制物体360展示

//把代码拖到摄像机上，target附在所要展示的物体上

public class MouseFollowRotation : MonoBehaviour {

public Transform target;            
public float xSpeed=200, ySpeed=200, mSpeed=10;
public float yMinLimit=-50, yMaxLimit=50;
public float distance=7, minDistance=2, maxDistance=30;

//bool needDamping = false;
public bool needDamping =true; 
float damping = 5.0f;

public float x = 0.0f;
public float y = 0.0f;

// Use this for initialization
void Start () {
Vector3 angles = transform.eulerAngles;
x = angles.y;
y = angles.x;
}

// Update is called once per frame
void LateUpdate () 
{

if (target) 
{
//use the light button of mouse to rotate the camera
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);

//print(Input.GetAxis("Mouse X"));
//print( Input.GetAxis("Mouse Y"));
//print(x);
//print(y);

} 

distance -= Input.GetAxis("Mouse ScrollWheel")*mSpeed;
distance = Mathf.Clamp(distance, minDistance, maxDistance);

Quaternion rotation = Quaternion.Euler(y, x, 0.0f);
Vector3 disVector = new Vector3( 0.0f, 0.0f, -distance );
Vector3 position = rotation * disVector + target.position;
//adjust the camera
if( needDamping )
{
transform.rotation = Quaternion.Lerp(transform.rotation, rotation, Time.deltaTime*damping);
transform.position = Vector3.Lerp(transform.position, position, Time.deltaTime*damping);
}
else
{
transform.rotation = rotation;
transform.position = position;
}

}
}

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);
}

}