Unity3D里实现物体移动到目标点，并且摄像机跟着移动的简单方案

初学Unity3D，老大给出个这样的题:当鼠标点击某个位置时，物体将会平滑的移动到此点,并且摄像机会跟随物体运动，自己的实现：。C#代码如下：

其中public Camera cam指定为Main Camera

float speed = 1.0f;
	RaycastHit hit = new RaycastHit();
	Vector3 velocity;
	Vector3 startPos;
	bool canMove = false;
	public Camera cam;
	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {
		
		if(Input.GetMouseButtonUp(0))
		{
			Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
			
			if(Physics.Raycast(ray,out hit,100))
			{
				if(null != hit.transform)
				{
					print("can move");
					canMove = true;
					startPos = transform.position;
					velocity = hit.point - startPos;
				}
					
			}
			
		}
		if(canMove && null != hit.transform)
		{
			print("ready for move");
			print(transform.position.ToString() + hit.point.ToString());
			if((transform.position.x - hit.point.x >0.01 || (transform.position.x - hit.point.x < -0.01)) ||
				(transform.position.y - hit.point.y > 0.01 || (transform.position.y - hit.point.y < -0.01)))
			{
				print("moving");
				transform.Translate(velocity/velocity.magnitude * speed * Time.deltaTime);
				cam.transform.Translate(velocity/velocity.magnitude * speed * Time.deltaTime);
				cam.transform.LookAt(transform.position);
			}else
			{
				print("can not move");
				canMove = false;
			}
			
		}
	}