**2. Virtual reality**

Virtual reality is a part of computer graphics. Today, it is possible for an ordinary user to become a part of VR through a suitable software product. The beginning of this field was given through computer games, which allow a person to experience things that are impossible to experience in real life [3]. Appropriate stereometry software will enable the student to enter this new research environment and interact with it instead of just looking at pictures on a monitor. The technology that enables such an experience is precisely virtual reality. In the current decade, it has become the most popular. VR primarily offers visual experiences on a computer screen or stereoscopic display. At the same time, VR can include additional multimedia, such as audio through headphones or a speaker and text. Interactivity in this virtual reality can be accomplished through the use of a keyboard, mouse, joystick or globe glove. The most used terms in the computer community are virtual reality, virtual environment, virtual world, artificial reality, etc. [3]. These real-time interactive graphics offers the user immersion in a three-dimensional world. Virtual reality systems can be grouped according to the level of immersion they offer the user. Mainly on immersion and non-immersion systems.

1.Non-immersive systems (desktop VR): Here, the immersion is relatively inferior than in other systems. It does not require special devices. Its other name is Window on World (WoW) [3]. The user can view the virtual environment through one or more computer screens. At the same time, he is allowed to interact but is

not immersed in it. These systems are relatively cheap and therefore are the most used. The effect they offer is satisfactory.


Main characteristics of immersion systems:

