Virtual Reality

### what is VR?

Virtual reality technology is an important direction of simulation technology, which is a collection of simulation technology and computer graphics, human-machine interface technology, multimedia technology, sensing technology, network technology, and other technologies. It is a challenging cross-technology frontier discipline and research field. Virtual reality technology （VR） mainly includes simulated environment, perception, natural skills and sensing equipment. Virtual reality, generally speaking, is to create a virtual world in a computer through various technologies. Users can immerse themselves in it, use visual, auditory, touch, smell and other senses to perceive the virtual world, and can interact with the scenes, objects, and even virtual characters.

### VR feature

#### perceptual

Multi-sensing means that computer technology should have many ways of perception, such as hearing, touch, smell, and so on. The ideal virtual reality technology should have the perceptual function that all people have. Due to the limitations of related technologies, especially sensing technologies, most of the perceptual functions of virtual reality technologies are limited to vision, hearing, touch, movement and so on.

#### Interactivity

Interactivity refers to the degree of operation of the objects in the simulated environment and the natural degree of feedback from the environment, the user enters the virtual space, and the corresponding technology enables the user to interact with the environment. When the user conducts certain operations, the surrounding environment will also make a certain response. If the user is exposed to the object in the virtual space, the user should be able to feel it on the hands. If the user moves on the object, the position and state of the object should also change.

#### Immersion

Immersion is the main characteristics of virtual reality technology, is to let the user become and feel oneself is part of the environment created by the computer system, virtual reality technology immersion depends on the user's perception system, when the user perceive the stimulation of the virtual world, including touch, taste, smell, motion, etc., will produce thinking resonance, cause psychological immersion, feel like into the real world.

### Application of the VR technology

#### Application in medicine

   For medical practitioners, it is difficult to carry out an efficient training to learn, which can easily solve this problem in VR. For example, studying the structure of the human body, cumbersome operation of medical instruments, complex surgery, through this 3D digital means, doctors can carry out a lot of training and improve the medical level.

#### Application in gaming and entertainment

In terms of entertainment, the requirement of virtual reality is not too high. As the carrier of information display, VR's potential application ability in the future art field should not be underestimated. VR's sense of presence participation and interaction ability can transform static art (such as oil painting, carving, etc.) into dynamic, which can make the viewer better appreciate the author's art. VR improves its artistic performance ability. For example, the Dunhuang "nine-story building" is the real scene and the virtual three-dimensional effect.

#### Application in the industrial field

Virtual reality has been widely used in the industrial fields. For the automotive industry, virtual reality technology is not only the latest technology development method, but also a complex simulation tool, which aims to build an artificial environment where people can engage in real-time activities such as driving, operation and design in a natural way. And virtual reality technology can also be widely used in car design, experimentation and training.

Virtual reality technology also has many applications in CAD, technical education and training. In the construction industry, virtual reality can serve as a further extension of those well-made building renderings. It can form a three-person architectural scene, people can walk freely in the building, can operate and control the equipment and room decoration in the building. On the one hand, the designer can understand and find the design deficiency from the perception of the scene; on the other hand, users can feel the real building space in the virtual environment, so as to make their own judgment.