using UnityEngine;
using System.Collections;

public class Build : MonoBehaviour {
public GameObject []Brick;
public RaycastHit Hit;
public Transform Cam;
float range = Mathf.Infinity;
public Texture []BlockTexture;
// Use this for initialization
void Start () {

    
}  
// Update is called once per frame
void Update () {
Screen.lockCursor=true;
Screen.showCursor=false;   
if(Input.GetMouseButtonDown(0)){
BuildBrick();   
}
if(Input.GetMouseButtonDown(1)){  
DestroyBrick();    
}
}
public void BuildBrick(){  
Vector3 Direction = Cam.TransformDirection(Vector3.forward);
if(Physics.Raycast(Cam.position, Direction, out Hit, 5000.0f)){  
Debug.Log("Build");      
if(Hit.collider.name=="Cube"){   
Instantiate(Brick[1],Hit.point,Quaternion.identity);
Brick[1].transform.position = Hit.transform.position + Hit.normal;     
Brick[1].name=("BuildBrick");
Brick[1].tag=("Brick_1");
}   
}  
}
public void DestroyBrick(){
Vector3 Direction = Cam.TransformDirection(Vector3.forward);
if(Physics.Raycast(Cam.position, Direction, out Hit, 5000.0f)){      
if(Hit.collider.name=="BuildBrick(Clone)"){   
Hit.collider.SendMessage("BUM",SendMessageOptions.DontRequireReceiver);     
}
}    
}
}

using UnityEngine;
using System.Collections;
[ExecuteInEditMode]
public class GeneratorTree : MonoBehaviour {
public int Count;
public int RandomX;
public int RandomY;
public Transform pref;

void Start (){
for(int i=0; i<Count; i++){
Instantiate(pref,transform.position+new Vector3(Random.Range(-RandomX,RandomX),0,Random.Range(-RandomY,RandomY)), transform.rotation);
   
}
}
}