@Override
	public boolean equals(Object o) {
		if (o instanceof Vector3D) {
			Vector3D p = (Vector3D) o;
			double xD = p.x - x, yD = p.y - y, zD = p.z - z;
			return xD == 0 && yD == 0 && zD == 0;
		}
		return false;
	}