public static boolean isValidIndex(Object[][][] array, Vector3Int index) {
   return ((index.getX() >= 0)
       && (index.getX() < array.length)
       && (index.getY() >= 0)
       && (index.getY() < array[0].length)
       && (index.getZ() >= 0)
       && (index.getZ() < array[0][0].length));
 }