Virtual reality is an artificial environment that is created with software and presented to the user in such a way that the user suspends belief and accepts it as a real environment. On a computer, virtual reality is primarily experienced through two of the five senses: sight and sound.
The simplest form of virtual reality is a 3-Dimage that can be explored interactively at a personal computer, usually by manipulating keys or the mouse so that the content of the image moves in some direction or zooms in or out. More sophisticated efforts involve such approaches as wrap-around display screens, actual rooms augmented with wearable computers, and hapticsdevices that let you feel the display images.
Virtual reality can be divided into:
The simulation of a real environment for training and education.
The development of an imagined environment for a game or interactive story.
The Virtual Reality Modelling Language (VRML) allows the creator to specify images and the rules for their display and interaction using textual language statement.
What does Virtual World mean?
A virtual world is a computer-based online community environment that is designed and shared by individuals so that they can interact in a custom-built, simulated world. Users interact with each other in this simulated world using text-based, two-dimensional or three-dimensional graphical models called avatars. Avatars are graphically rendered using computer graphics imaging (CGI) or any other rendering technology. Individuals control their avatars using input devices like the keyboard, mouse and other specially designed command and simulation gadgets. Today's virtual worlds are purpose-built for entertainment, social, educational, training and various other purposes.
All virtual worlds possess the qualities of persistence and interactivity. This enables the users to explore the inherent benefits of socialization and allows them to study human nature and users' abilities.
A virtual world may also be called a digitial world.
Virtual World
Initially, virtual worlds were limited to text and document sharing such as in chat rooms and through conferencing systems. With the advancement in two-dimensional and three-dimensional graphics rendering technologies, graphical models called avatars became the hallmark of virtual worlds. Today, virtual worlds depict a world very similar to reality, with real-world rules and real-time actions and communications. Avatars are real-world or fictionally adapted personalized characters that depict humans, pets or other imaginary characters that inhabit virtual worlds. Today's avatars are three-dimensional, interactive icons that exist in realistic virtual worlds.
There are two types of virtual worlds:
Entertainment-Based:
The launch of multiplayer 3-D games in the 1990s gave birth to new advancements in interactive virtual worlds. In this category of virtual worlds, users play games through their avatars. These virtual worlds are strongly influenced by fantasy, science fiction, and anime genres of literature and film. Entertainment-based virtual worlds represents the majority of virtual worlds in existence today.
Social Interaction-Based: Focuses on user interaction, education and training through simulated worlds. These worlds offer a more open-ended experience such as exploring landscapes, playing adventurous sports, socializing with communities, taking part in political debates or experiments, attending educational sessions, training in a simulated environment and countless other virtual possibilities. Although younger than gaming worlds, these social virtual worlds are quickly gaining popularity, particularly in educational, political, commercial and military organizations.So what are the top ten virtual worldsfor adults?
These are:
Second Life
World of Warcraft
Sony PlayStation Home
The Sims
IMVU
Blue Mars
Utherverse
Kaneva
Active Worlds
Meet Me.
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