using UnityEngine;
using System.Collections;

public class test : MonoBehaviour {
    public Transform spawnPoint;
    public Texture2D trunkCrossHair;
    public float cursorSizeX = 32;
    public float cursorSizeY = 32;
       
    // Use this for initialization
    void Start () {
       
    }
       
    // Update is called once per frame
    void Update () {
    RaycastHit hit;
     if(Physics.Raycast(spawnPoint.transform.position,spawnPoint.forward ,out hit)){
       screenPos = Camera.main.WorldToScreenPoint(hit.point);
      Debug.DrawLine(spawnPoint.transform.position, hit.point);
     }
    }
       
    void OnGUI(){
     GUI.DrawTexture (new Rect (screenPos.x -(cursorSizeX/2)  , screenPos.y - (cursorSizeY/2), cursorSizeX, cursorSizeY),trunkCrossHair);
    }
}

using UnityEngine;    
using System.Collections;    

public class test : MonoBehaviour {    
     public Transform spawnPoint;    
     private Vector3 screenPos;    
     public Texture2D trunkCrossHair;    
     public float cursorSizeX = 32;    
     public float cursorSizeY = 32;    
     private  RaycastHit hit;    
         
     // Use this for initialization    
     void Start () {    
         
     }    
         
     // Update is called once per frame    
     void Update () {    
       
      Physics.Raycast(spawnPoint.transform.position,spawnPoint.forward ,out hit);
          
     }    
         
     void OnGUI(){    
      GUI.DrawTexture (new Rect (OnScreen(hit.point).x -(cursorSizeX/2)  , OnScreen(hit.point).y - (cursorSizeY/2), cursorSizeX, cursorSizeY),trunkCrossHair);
     }    
Vector3 OnScreen(Vector3 pos){
     pos = Camera.main.WorldToScreenPoint(pos);
           pos.y = Screen.height - pos.y;
           return pos;
    }
}