Virtual reality (?VR?) is a simulated experience that can be similar to or completely different from the real world. Applications of virtual reality include entertainment (e.g., video games), education (e.g., medical or military training), and business (e.g., virtual meetings). Other different types of VR-style technologies include augmented reality and mixed reality, sometimes referred to as extended reality or XR.
Theoretically, virtual reality (VR) technology is a computer simulation system that allows for the creation and experience of virtual worlds, which utilizes computers to generate a simulated environment that immerses the user in that environment.
Virtual reality technology is the use of real-life data, electronic signals generated by computer technology, combined with a variety of output devices so that they can be converted into phenomena that people can feel, these phenomena can be real objects in reality, or can be the material we can not see with the naked eye, through the three-dimensional model of the performance.
Because these phenomena are not directly visible to us, but are simulated by computer technology in the real world, so it is called virtual reality.
Virtual reality technology has been recognized by more and more people, the user can experience the most realistic feelings in the virtual reality world, the authenticity of its simulated environment and the real world is indistinguishable from the real world, so that people have a kind of immersive feeling; at the same time, the virtual reality has all the perceptual functions owned by human beings, such as auditory, visual, tactile, gustatory, olfactory and other perceptual systems;
Finally, it has a super simulation system, which can be used to simulate the real world. It is the presence, multi-sensory, interactive and other characteristics of virtual reality technology makes it loved by many people.
Forms
In projector-based virtual reality, the modeling of real environments plays a crucial role in a variety of virtual reality applications such as robot navigation, architectural modeling, and aircraft simulation. Image-based virtual reality systems are becoming increasingly popular in the computer graphics and computer vision communities. In generating realistic models, the acquired 3D data must be accurately aligned; typically, cameras are used to model small objects in close proximity.
Desktop-based virtual reality involves displaying 3D virtual worlds on regular desktop monitors without the need for any specialized VR position-tracking equipment. Many modern first-person video games can be used as examples, using a variety of triggers, responsive characters, and other such interaction devices to make the user feel as if they were in the virtual world.
A common criticism of this form of immersion is that there is no sense of peripheral vision, limiting the user's ability to understand what is happening around them.
A head-mounted display (HMD) more fully immerses the virtual world user. A virtual reality headset typically consists of two small high-resolution OLED or LCD displays, which are used to provide stereo graphics rendering of the 3D virtual world with an image for each eye individually, a binaural audio system, and positional and rotational real-time head tracking for six degrees of motion.
Options include motion controls with haptic feedback for an intuitive way to physically interact in the virtual world with little abstraction and an omnidirectional treadmill? for more freedom of body movement, allowing users to locomote in any direction.
References to the above? Baidu Encyclopedia-Virtual Reality