During the development of such technology, the VR pioneers have not stopped trying to deliver the more realistic experience. Bringing people to where they will never get the chance to go has become the goal for nearly every VR company -- one can simply tell that by paying attention to the number of appearances of the phrase "being there" in the press about VR. Powered by the development of the digital technology, virtual reality (VR) gets resurrected because of the photo-realistic experience it could offer. However,