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unity3d 判断目标物体对于我的方向

using UnityEngine;
using System.Collections;

public class D2 : MonoBehaviour {
	public Transform targetTF;
	void Start () {
	
	}

	void Update () {
		checkTargetDirForMe (targetTF);
	}

	void checkTargetDirForMe(Transform target){
		Vector3 dir = target.position - transform.position;
		Vector3 cross = Vector3.Cross (transform.forward,dir.normalized);
		float dot = Vector3.Dot (transform.forward,dir.normalized);
		string dirText = "";
		if (cross.y > 0) {
			dirText += "右";
		} else if(cross.y < 0) {
			dirText += "左";
		}else {
			dirText += "正";
		}
		if (dot > 0) {
			dirText += "上";
		} else if(dot < 0) {
			dirText += "下";
		}else {
			dirText += "中";
		}
		print (dirText);
	}
}

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