unity基础开发----物品展示必备代码（旋转，缩放）

using UnityEngine;

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;
	
	
	public void SetTarget( GameObject go )
	
	
	{
		target = go.transform;
	}
	// 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);
	}
}

var moveSpeed : float = 1; 
var cam : Transform;
 
function Update () {
    if (Input.GetMouseButton(1))//按下鼠标右键 
    {
        transform.rotation = cam.rotation;//cam旋转等于Transform
        transform.Translate(Vector3.right * -Input.GetAxis("Mouse X") * moveSpeed); //
        transform.Translate(transform.up * -Input.GetAxis("Mouse Y") * moveSpeed, Space.World); 
    }
}