Virtual reality

Virtual reality (VR) is a technology, which allows a user to interact with a computer-simulated environment, be it a real or imagined one. Most current virtual reality environments are primarily visual experiences, displayed either on a computer screen or through special or stereoscopic displays, but some simulations include additional sensory information, such as sound through speakers or headphones. Some advanced, haptic systems now include tactile information, generally known as force feedback, in medical and gaming applications. Users can interact with a virtual environment or a virtual artifact (VA) either through the use of standard input devices such as a keyboard and mouse, or through multimodal devices such as a wired glove, the Polhemus boom arm, and omnidirectional treadmill. The simulated environment can be similar to the real world, for example, simulations for pilot or combat training, or it can differ significantly from reality, as in VR games. In practice, it is currently very difficult to create a high-fidelity virtual reality experience, due largely to technical limitations on processing power, image resolution and communication bandwidth. However, those limitations are expected to eventually be overcome as processor, imaging and data communication technologies become more powerful and cost-effective over time.



Terminology
The term artificial reality, coined by Myron Krueger, has been in use since the 1970s but the origin of the term virtual reality is uncertain. It has been credited to The Judas Mandala, a 1982 science fiction novel by Damien Broderick, where the context of use is somewhat different from that defined above. The earliest use cited by the Oxford English Dictionary is in a 1987 article entitled "Virtual reality", but the article is not about VR technology. The VR developer Jaron Lanier claims that he coined the term. The concept of virtual reality was popularized in mass media by movies such as Brainstorm and The Lawnmower Man (and others mentioned below), and the VR research boom of the 1990s was motivated in part by the non-fiction book Virtual Reality by Howard Rheingold. The book served to demystify the subject, making it more accessible to less technical researchers and enthusiasts, with an impact similar to what his book The Virtual Community had on virtual community research lines closely related to VR. Multimedia: from Wagner to Virtual Reality, edited by Randall Packer and Ken Jordan and first published in 2001, explores the term and its history from an avant-garde perspective.

Timeline
Morton Heilig wrote in the 1950s of an "Experience Theatre" that could encompass all the senses in an effective manner, thus drawing the viewer into the onscreen activity. He built a prototype of his vision dubbed the Sensorama in 1962, along with five short films to be displayed in it while engaging multiple senses (sight, sound, smell, and touch). Predating digital computing, the Sensorama was a mechanical device, which reportedly still functions today. In 1968, Ivan Sutherland, with the help of his student Bob Sproull, created what is widely considered to be the first virtual reality and augmented reality (AR) head mounted display (HMD) system. It was primitive both in terms of user interface and realism, and the HMD to be worn by the user was so heavy it had to be suspended from the ceiling, and the graphics comprising the virtual environment were simple wireframe model rooms. The formidable appearance of the device inspired its name, The Sword of Damocles. Also notable among the earlier hypermedia and virtual reality systems was the Aspen Movie Map, which was created at MIT in 1977. The program was a crude virtual simulation of Aspen, Colorado in which users could wander the streets in one of three modes: summer, winter, and polygons. The first two were based on photographs &mdash; the researchers actually photographed every possible movement through the city's street grid in both seasons &mdash; and the third was a basic 3-D model of the city. In the late 1980s the term "virtual reality" was popularized by Jaron Lanier, one of the modern pioneers of the field. Lanier had founded the company VPL Research (from "Virtual Programming Languages") in 1985, which developed and built some of the seminal "goggles n' gloves" systems of that decade.

Future
It is unclear exactly where the future of virtual reality is heading. In the short run, the graphics displayed in the HMD will soon reach a point of near realism. The audio capabilities will move into a new realm of three dimensional sound. This refers to the addition of sound channels both above and below the individual or a Holophony approach.

Within existing technological limits, sight and sound are the two senses which best lend themselves to high quality simulation. There are however attempts being currently made to simulate smell. The purpose of current research is linked to a project aimed at treating Post Traumatic Stress Disorder (PTSD) in veterans by exposing them to combat simulations, complete with smells. Although it is often seen in the context of entertainment by popular culture, this illustrates the point that the future of VR is very much tied into therapeutic, training, and engineering demands. Given that fact, a full sensory immersion beyond basic tactile feedback, sight, sound, and smell is unlikely to be a goal in the industry. It is worth mentioning that simulating smells, while it can be done very realistically, requires costly research and development to make each odor, and the machine itself is expensive and specialized, using capsules tailor made for it. Thus far basic, and very strong smells such as burning rubber, cordite, gasoline fumes, and so-forth have been made. Something complex such as a food product or specific flower would be prohibitively expensive (see the perfume industry as an example).

Not content to serve only its customers' eyes and ears, Japan's NTT Communications, of Tokyo, has just finished testing an Internet-connected odor-delivery system to be used by retailers and restaurants to attract customers. Whether NTT has sniffed out a new commercial opportunity or this attempt to engage our olfactory sense will fail the smell test is too early to judge. But as new trials and applications are tried out and more data gathered, Hamada says he is sure the technology “will take communications to a new level in content richness, compared to today’s communications, which only offers images and sounds”.

In order to engage the other sense of taste, the brain must be manipulated directly. This would move virtual reality into the realm of simulated reality like the "head-plugs" used in The Matrix. Although no form of this has been seriously developed at this point, Sony has taken the first step. On April 7, 2005, Sony went public with the information that they had filed for and received a patent for the idea of the non-invasive beaming of different frequencies and patterns of ultrasonic waves directly into the brain to recreate all five senses. There has been research to show that this is possible. Sony has not conducted any tests as of yet and says that it is still only an idea.

It has long been feared that Virtual Reality will be the last invention of humans, as once simulations become cheaper and more widespread, no one will ever want to leave their "perfect" fantasies. Satirists, however, have nodded towards humans' aversion to catheters and starvation.

Impact
There has been increasing interest in the potential social impact of new technologies, such as virtual reality (as may be seen in utopian literature, within the social sciences, and in popular culture). Mychilo S. Cline, in his book, Power, Madness, and Immortality: The Future of Virtual Reality, argues that virtual reality will lead to a number of important changes in human life and activity. He argues that:
 * Virtual reality will be integrated into daily life and activity and will be used in various human ways.
 * Techniques will be developed to influence human behavior, interpersonal communication, and cognition (i.e., virtual genetics).
 * As we spend more and more time in virtual space, there will be a gradual “migration to virtual space,” resulting in important changes in economics, worldview, and culture.
 * The design of virtual environments may be used to extend basic human rights into virtual space, to promote human freedom and well-being, and to promote social stability as we move from one stage in socio-political development to the next.

Heritage and Archaeology
The use of VR in Heritage and Archaeology has enormous potential in museum and visitor centre applications, but its use has been tempered by the difficulty in presenting a 'quick to learn' real time experience to numerous people any given time. Many historic reconstructions tend to be in a pre-rendered format to a shared video display, thus allowing more than one person to view a computer generated world, but limiting the interaction that full-scale VR can provide. The first use of a VR presentation in a Heritage application was in 1994 when a museum visitor interpretation provided an interactive 'walk-through' of a 3D reconstruction of Dudley Castle in England as it was in 1550. This comprised of a computer controlled laserdisc based system designed by British based engineer Colin Johnson. It is a little known fact that one of the first users of Virtual Reality was Her Majesty Queen Elizabeth II, when she officially opened the visitor centre in June 1994. Details of the original project can be viewed here:Virtual Tours of Dudley Castle archive. The system featured in a conference held by the British Museum in November 1994 and in the subsequent technical paper.. 'Imaging the Past' - Electronic Imaging and Computer Graphics in Museums and Archaeology - ISBN 0861591143.

Mass media
Mass media has been a great advocate and perhaps a great hindrance to its development over the years. During the research “boom” of the late 1980s into the 1990s the news media’s prognostication on the potential of VR &mdash; and potential overexposure in publishing the predictions of anyone who had one (whether or not that person had a true perspective on the technology and its limits) &mdash; built up the expectations of the technology so high as to be impossible to achieve under the technology then or any technology to date. Entertainment media reinforced these concepts with futuristic imagery many generations beyond contemporary capabilities.

Fine Art
David Em was the first fine artist to create navigable virtual worlds in the 1970s. His early work was done on mainframes at III, JPL and Cal Tech. Jeffrey Shaw explored the potential of VR in fine arts with early works like Legible City (1989), Virtual Museum (1991), Golden Calf(1994). Canadian artist Char Davies created immersive VR art pieces Osmose (1995) and Ephémère (1998). Maurice Benayoun's work introduced metaphorical, philosophical or political content, combining VR, network, generation and intelligent agents, in works like Is God Flat (1994), The Tunnel under the Atlantic (1995), World Skin (1997).

Marketing
A side effect of the chic image that has been cultivated for virtual reality in the media is that advertising and merchandise have been associated with VR over the years to take advantage of the buzz. This is often seen in product tie-ins with cross-media properties, especially gaming licenses, with varying degrees of success. The Nintendo Entertainment System Power Glove by Mattel from the 1980s was an early example as well as the U-Force and later, the Sega Activator. Marketing ties between VR and video games are not to be unexpected, given that much of the progress in 3D computer graphics and virtual environment development (traditional hallmarks of VR) has been driven by the gaming industry over the last decade. TV commercials featuring VR have also been made for other products, however, such as Nike's "Virtual Andre" in 1997, featuring a teenager playing tennis using a goggle and gloves system against a computer generated Andre Agassi.

Health care education
While its use is still not widespread, virtual reality is finding its way into the training of health care professionals. Use ranges from anatomy instruction (example) to surgery simulation (example). Annual conferences are held to examine the latest research in utilizing virtual reality in the medical fields.

Therapeutic uses
The primary use of VR in a therapeutic role is its application to various forms of exposure therapy, ranging from phobia treatments, to newer approaches to treating PTSD. A very basic VR simulation with simple sight and sound models has been shown to be invaluable in phobia treatment (notable examples would be various zoophobias, and acrophobia) as a step between basic exposure therapy such as the use of simulacra and true exposure. A much more recent application is being piloted by the U.S. Navy to use a much more complex simulation to immerse veterans (specifically of Iraq) suffering from PTSD in simulations of urban combat settings. While this sounds counterintuitive, talk therapy has limited benefits for people with PTSD, which is now thought by many to be a result of changes either to the limbic system in particular, or a systemic change in stress response. Much as in phobia treatment, exposure to the subject of the trauma or fear seems to lead to desensitization, and a significant reduction in symptoms. Some information on this can be found at this Businessweek article as well as this Office of Naval Research article.

Manufacturing
Virtual reality can serve to new product design, helping as an ancillary tool for engineering in manufacturing processes, new product prototype and simulation. Among other examples, we may also quote Electronic Design Automation, CAD, Finite Element Analysis, and Computer Aided Manufacturing. The use of Stereolithography and 3D printing shows how computer graphics modeling can be applied to create physical parts of real objects used in naval, aerospace and automotive industry. Beyond modeling assembly parts, 3D computer graphics techniques are currently used in the research and development of medical devices for innovative therapies, treatments, patient monitoring, and early diagnosis of complex diseases.

Implementation
To develop a real time virtual environment, a computer graphics library can be used as embedded resource coupled with a common programming language, such as C++, Perl, Java or Python. Some of the most popular computer graphics library/API/language are OpenGL, Java3D and VRML, and their use will be directly influenced by the system demands in terms of performance, program purpose, and hardware platform. The use of multithreading (e.g. Posix) can also accelerate 3D performance and enable cluster computing with multi-user interactivity.

Challenges
Virtual reality has been heavily criticized for being an inefficient method for navigating non-geographical information. At present, the idea of ubiquitous computing is very popular in user interface design, and this may be seen as a reaction against VR and its problems. In reality, these two kinds of interfaces have totally different goals and are complementary. The goal of ubiquitous computing is to bring the computer into the user's world, rather than force the user to go inside the computer. The current trend in VR is actually to merge the two user interfaces to create a fully immersive and integrated experience. See simulated reality for a discussion of what might have to be considered if a flawless virtual reality technology was possible. Another obstacle is the headaches due to eye strain, caused by VR headsets. RSI can also result from repeated use of the handset gloves.

Further references

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