• “Real-time interactive graphics with three-dimensional models

• “Real-time interactive graphics with three-dimensional models, combined with a display technology that gives the user the immersion in the model world and direct manipulation.”
• “The illusion of participation in a synthetic environment rather than external observation of such an environment. VR relies on a three-dimensional, stereoscopic head-tracker displays, hand/body tracking and binaural sound. VR is an immersive, multi-sensory experience.”
• “Virtual reality refers to immersive, interactive, multi-sensory, and viewer-centered, three dimensional computer generated environments and the combination of technologies required to build these environments.”
Virtual reality (VR) is a technology that allows a user to interact with a computer-generated 3D environment, whether that environment is a stimulation of a real world or an imaginary world. It is a medium of creating our own customized world and reality. It could range from creating a video game to having a virtual amble around the universe, from walking through our own dreams or to an alien planet. In other words, VR is the use of three-dimensional graphics to create, manipulate and enhance our environment by using a fourth dimension, the dimension of our imagination. With VR, we can experience the most scary and grueling grueling situations by playing safe and by learning something.
EVOLUTION
The idea of Virtual Reality was first introduced in 1965, by Ivan Sutherland.
The term Virtual Reality was first invented in 1989, by Jaron Lanier, who was the founder of VPL Research. In the early 1990s, the research and improvement in the field of VR was much expanded, making the term Virtual Reality, highly notable.
Virtual Reality is considered to have begun in the 1950s but it got famous among public in the late 1980s and 1990s. The most of the historical virtual reality examples are visual, while some are, auditory. Let us take a look at some of the researches and highlights of VR over the former thirty years. .
• SENSORAMA
In 1960-1962, Morton Heilig designed The Sensorma Machine. A recorded color film was shown with fans, chemical scents and binaural sound system, including movable chair.
• THE ULTIMATE DISPLAY
In 1965, Ivan Sutherland redefined virtual reality. He gave the ultimate idea of artificial world production including interactive graphics, force-feedback (touch), sound, aroma and taste.
• THE SWORD OF DEMOCLES
It was the first VR system which recognized the use of hardware. Ivan Sutherland constructed the first Head Mounted Display (HMD) device with the ability of head pursuing.
• VIDEOPLACE
It was an Artificial Reality created in 1975 by Myron Krueger – “a conceptual environment, with no existence”.
• VCASS
VCASS stands for the Visually Coupled Airborne Systems Simulator, an advanced flight stimulator. Thomas Furness working in the US Air Force’s Armstrong Medical Research Laboratories developed it, in 1982.
• VPL
The VPL Company manufactured the popular DataGlove (1985), and the Eyephone HMD (1988), the VR devices available commercially, for the first time.
• BOOM
BOOM stands for Binocular Omni-Orientation Monitor. BOOM is a small box with two CRT monitors, fit in the binoculars and can be seen through eye holes. The user grabs the box, keeps it by the eyes and moves in the virtual world. It uses mechanical tracking technology to measure the position and orientation of the box.
• CAVE
It stands for CAVE Automatic Virtual Environment. It uses scientific visualization system. Instead of using a HMD, it projects stereoscopic images on a cube shaped VR room having projection screens on the walls, ceilings and floors. The user wears the VR headset or head-up display (HUD), with input devices such as joysticks, wands or data gloves.
FORMS OF REALITY
Reality takes many types and can be considered to mountain chain on a virtuality continuum from the real surroundings to virtual environments. These forms, which are somewhere between virtual and augmented reality, are broadly defined as “mixed reality,” which can be further broken down to “Augmented Reality” and “Augmented Virtuality”.
REALITY SYSTEM
A reality system is the hardware and software that full sensory experiences are constructed upon. Its job is to correctly communicate the software content material to and from the consumer in an intuitive manner as though the person is interacting with the actual world. Conversation among the human and system is completed through hardware gadgets.
1. Oculus Rift Invented by a VR enthusiast named Palmer Luckey. (Smith, 2016) An inertial sensor-embedded VR HMD that monitors head movement.
2. HTC Vive The HTC Vive, offers a large field-of-view, high-resolution HMD together with a room-scale tracking system.
3. Samsung Gear Samsung Gear VR, unveiled first at IFA 2014, offers an unreal real 360 degree VR experience that allows you a total immersion in the virtual environment.
4. PlayStation VR PlayStation VR brings the world of virtual reality to consoles in a big way, and it does so without the cost most often associated with rival higher-end VR headsets.

ARCHITECTURE:
Architecture is probably one of the great actual applications for VR. It can correctly be used to decorate the revel in of walking inner or around a structure that doesn’t exist. Blueprints best supply a 2nd representation of the constructing but VR permits us to experience the constructing in an immersive manner that offers an almost actual-life illustration. In addition to visualizing the digital surroundings VR also can be used as a device for building the surroundings itself. This is a enormously new method to using VR in architecture and is yet to prove its practicality. One instance of this sort of utility is the shadow mild-mirage project developed in the University of Illinois.
GAMING
Gaming in VR is not merely confined to amusement, however it’s been improved to special fields, in particular with the cause to study or teach through gaming, normally referred as edutainment or critical video games. Simulation strategies are used to build digital worlds wherein users are immersed and deceive the human senses, in order that the perceptual cues that reach the brain are aligned with an alternative reality. Those perceptual cues can be of various natures, inclusive of acoustic, visible, haptic, odor, and motion stimuli.
ENTERTAINMENT
If there may be a new era popping out, cinemas and film industry are usually the first ones to try it out. Same is the case with VR. The primary try of making cinema greater interactive goes back to 1960 when the movie ‘Scent of Mystery’ covered a new era known as ‘Smell-o-Vision’. The new edition launched odors and scents to satisfy the action from the screen.
Amsterdam is the house of the primary VR cinema. Opened in mid-2016, the VR silver screen does not take after a conventional film – crowd sits in a plain room, without a show screen, arranged best with work environment style turning seats.

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Conveying a head-mounted show, members see the film absolutely in virtual reality.
MEDICINE
Psychologists have observed VR to be useful for treating post-horrible pressure issue.

• VR has been appeared to decrease uneasiness in most tumor sufferers experiencing chemotherapy imbuements.

• • Recently, VR assumed an indispensable part in the fruitful partition of conjoined twins at Masonic Children’s Hospital in Minneapolis.
But burn sufferers may be some of the largest beneficiaries of VR. From each day cleaning and bandaging of burns to pores and skin grafts, excessive burn sufferers revel in “a number of the most painful processes in medicine,” stated dr. Hunter hoffman, a University of Washington scientist. For those patients, hoffman helped create the VR recreation “snow world,” which functions imagery designed particularly to distract burn sufferers from ache. Sufferers who play the sport in the course of remedy report up to 50 percent much less pain.
LOSS OF SPATIAL AWARENESS
Spending additional than the supported 30 minutes in VR will, in about each case, reason you to lose spatial acknowledgment of the room around you.
Following 30 minutes it turns out to be much hard to figure your whereabouts, where the things are physically present from inside of your headset.

SEIZURES
A few people (around 1 out of 4000) may furthermore have extreme dazedness, seizures, eye or muscle jerking or blackouts activated through light flashes or styles.
This could emerge while they’re watching VR, wagering computer games or encountering virtual reality, although they had in no way, shape or form had a seizure previously.

NAUSEA
VR causes nausea, usually because it’s related to movement illness and the velocity of the items moving in the game you are playing.

Other condition known as “cyber sickness” or “sim sickness” is due to being overwhelmingly immersed with the stimulated world.