unity3d触屏操作对象运动

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using UnityEngine; using System.Collections;   public class robot : MonoBehaviour {           private GameObject myRobot;     private Camera carmera;           // Use this for initialization     void Start () {         myRobot = GameObject.Find("robot");         //carmera = Camera.main;         //第二种方式去获取Camera         //carmera = GameObject.Find("Main Camera").GetComponent<Camera>();                       Input.multiTouchEnabled = true;     }           // Update is called once per frame     void Update () {         handInput();     }           void handInput() { #if !UNITY_EDITOR && ( UNITY_IOS || UNITY_ANDROID )         mobileInput(); #else         if (Input.GetKey(KeyCode.UpArrow)) {             myRobot.transform.Translate(Vector3.forward * Time.deltaTime);         }         if (Input.GetKey(KeyCode.DownArrow)) {             myRobot.transform.Translate(-Vector3.forward * Time.deltaTime);         }         if (Input.GetKey(KeyCode.LeftArrow)) {             myRobot.transform.Translate(Vector3.left * Time.deltaTime);         }         if (Input.GetKey(KeyCode.RightArrow)) {             myRobot.transform.Translate(Vector3.right * Time.deltaTime);         } //      float x = carmera.WorldToScreenPoint(myRobot.transform.position).x; //      Debug.Log("x = " + x); #endif     }           void mobileInput() {         if (Input.touchCount == 1) {                           if (Input.touches[0].phase == TouchPhase.Moved){                 float x = Input.touches[0].position.x;                 float y = Input.touches[0].position.y;                 if (x > carmera.WorldToScreenPoint(myRobot.transform.position).x) {                                      myRobot.transform.Translate(Vector3.right * Time.deltaTime);                 } else if (x < carmera.WorldToScreenPoint(myRobot.transform.position).x) {                                               myRobot.transform.Translate(-Vector3.right * Time.deltaTime);                 }                                   if (y > carmera.WorldToScreenPoint(myRobot.transform.position).y) {                                      myRobot.transform.Translate(Vector3.forward * Time.deltaTime);                 } else if (y < carmera.WorldToScreenPoint(myRobot.transform.position).y) {                                               myRobot.transform.Translate(-Vector3.forward * Time.deltaTime);                 }                           }         }     }       }

　　1. 两种获取Camera方式。

     2. 手机触屏操作，需要进行世界坐标转屏幕坐标。