Unity3D перемещение объектов

using UnityEngine;
using System.Collections;
 
public class one : MonoBehaviour {
 
    public GameObject a;
    public BuildManager bm;
 
    // Use this for initialization
    void Start () 
    {
        bm = GameObject.FindGameObjectWithTag ("MainCamera").GetComponent<BuildManager>();
    }
    
    // Update is called once per frame
    void Update () {
    
    }
    void OnMouseDown()
    {
        Camera.main.GetComponent<BuildManager> ().setBuild (a);
        Destroy (a);
    }
}
 
и вот второй 
 
using UnityEngine;
using System.Collections;
 
public class BuildManager : MonoBehaviour {
 
    public GameObject _currentBuild;
    public LayerMask mask;
 
    private GlobalDB _GDB;
 
    // Use this for initialization
    void Start () {
        _GDB = GameObject.FindGameObjectWithTag("MainCamera").GetComponent<GlobalDB>();
    }
 
    // Update is called once per frame
    void Update () {
        if(_currentBuild != null)
        {
            Ray ray;
            RaycastHit hit;
 
            ray = UnityEngine.Camera.main.ScreenPointToRay(Input.mousePosition);
            if (Physics.Raycast(ray, out hit, 10000.0f, mask))
            {
                _currentBuild.transform.position = hit.point;
            }
 
            if(Input.GetMouseButtonDown(0) && _GDB.numIntersection == 0)
            {
                _currentBuild.tag = "Untagged";
                _currentBuild = null;
                _GDB.deactivationTrigger();
            }
        }
    }
 
        public void setBuild (GameObject go)
    {
        _currentBuild = (GameObject) Instantiate (go);
        _currentBuild.tag = "CurBuild";
        _GDB.activationTrigger();
    }
}

Destroy (a);