boolean checkedBlockIsWithinFurnaceCheckCube(int checkedX, int checkedY, int checkedZ, int furnace_x1, int furnace_x2, int furnace_y1, int furnace_y2, int furnace_z1, int furnace_z2)
   {
      boolean res = false;

      if((checkedX >= furnace_x1) && (checkedX <= furnace_x2) &&
            (checkedY >= furnace_y1) && (checkedY <= furnace_y2) &&
            (checkedZ >= furnace_z1) && (checkedZ <= furnace_z2))
      {
         res = true;
      }  

      return (res);
   }