For vr, many people still feel strange, do not know what this means, what technology is represented, in fact, vr is virtual reality, below we specifically introduce what vr is , what features it has, and where is the specific application field? Wait, let’s take a look at it all.

What is vr technology?

VR (Virtual Reality, VR for short) was proposed by American VPL company founder Jaron Lanier in the early 1980s. The specific connotation is: comprehensively utilizing computer graphics systems and various interface devices such as reality and control to provide immersive sensation technology in a three-dimensional environment that can be generated on a computer. Among them, the computer-generated, interactive 3D environment becomes a virtual environment (ie, Virtual Environment, VE for short). The carrier implemented by virtual reality technology is a virtual reality simulation platform (Virtual Reality Platform, or VRP for short).

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VR technology introduction

VR = Virtual Reality, or Virtual Reality, is actually a computer system that creates and experiences Virtual World.

So what is virtual reality technology?

Virtual Reality (VR) was proposed by American VPL founder Jaron Lanier in the early 1980s. The specific connotation is: comprehensively utilizing computer graphics systems and various interface devices such as reality and control to provide immersive sensation technology in a three-dimensional environment that can be generated on a computer. Among them, the computer-generated, interactive 3D environment becomes a virtual environment (ie, Virtual Environment, VE for short).

On March 26, 2014, Facebook, the US social networking platform, announced that it will spend $2 billion to acquire Oculus VR, an immersive virtual reality technology company. Mark Zuckerberg, CEO of Fackbook, believes that virtual reality will be another big event in computing platforms after mobile devices such as smartphones and tablets. And plans to extend Oculus’s applications beyond the game, before Oculus was used to create an immersive feel for people in the game. Facebook’s acquisition of Oculus made virtual reality, a niche term for the technology industry, begin to become familiar to more outsiders. According to industry insiders, virtual reality has ushered in spring for more than 70 years.Image result for vr technology

Vr development history

The evolution of virtual reality technology can be divided into four stages. The simulation of voice-like dynamics is the first stage of implication of virtual reality. (1963) The virtual reality sprouted into the second stage (1963-1972). And the theory is initially formed into the third stage (1973-1989). The virtual reality theory is further improved and applied as the fourth stage (1990-2004).

What is vr? What are the application areas?

VR (Virtual Reality) technology can be widely used in urban planning, interior design, industrial simulation, monument restoration, bridge road design, real estate sales, tourism teaching, water conservancy and electric power, geological disasters, education and training, etc. s solution.

In the field of advanced manufacturing, standing in front of the 3D image of the large aircraft engine, the strength of the “virtually disassembled” virtual reality is vividly displayed. The operator can remove many of the components of the virtual engine one by one and enter the interior of the engine. “Virtual Reality” realizes cross-platform interactive design, virtual display, virtual assembly, CAE data visualization and other functions, greatly improving the design efficiency of the design team, enabling developers to timely identify and correct design defects and potential process problems, and improve Manufacturing success rate for product development.

Key technology

Virtual reality is a combination of multiple technologies, including real-time 3D computer graphics technology, wide-angle (wide-view) stereo display technology, tracking technology for observers’ heads, eyes and hands, as well as tactile/force feedback, stereo, network transmission, voice Input and output technology, etc. These techniques are described separately below.

Real-time 3D computer graphics

In contrast, using computer models to generate graphical images is not too difficult. If there are enough accurate models and enough time, we can generate accurate images of various objects under different lighting conditions, but the key here is real-time. For example, in flight simulation systems, image refreshing is important, and image quality requirements are high. Coupled with very complex virtual environments, the problem becomes quite difficult.

display

When people look at the world around them, because the positions of the two eyes are different, the images obtained are slightly different. These images are merged in the brain to form a whole picture about the surrounding world. This scene includes information about the distance. . Of course, the distance information can also be obtained by other methods, such as the distance of the eye focal length, the comparison of the object size, and the like.

In the VR system, binocular stereo vision plays a big role. The different images seen by the user’s two eyes are generated separately and displayed on different displays. Some systems use a single display, but after the user wears special glasses, one eye can only see odd frames, the other eye can only see even frames, and the difference between odd and even frames is parallax. It produces a three-dimensional feeling.

User (head, eye) tracking

In an artificial environment, each object has a position and attitude relative to the system’s coordinate system, and so does the user. The scene that the user sees is determined by the location of the user and the direction of the head (eye).Image result for vr technology

Virtual reality headgear for tracking head movement: In traditional computer graphics technology, the change of field of view is realized by mouse or keyboard, the user’s visual system and motion perception system are separated, and the head tracking is used to change the image. The perspective between the user’s visual system and the motion perception system can be linked and feels more realistic. Another advantage is that the user can not only recognize the environment through binocular stereo vision, but also observe the environment through the movement of the head.

Keyboard and mouse are the most commonly used tools in user interaction with computers, but they are not suitable for 3D space. Because of the six degrees of freedom in three-dimensional space, it is difficult to find a more intuitive way to map the planar motion of the mouse to any motion in three dimensions. Now, there are already some devices that offer six degrees of freedom, such as the 3Space digitizer and the SpaceBall space ball. Other devices with superior performance are data gloves and data clothing.

sound

People can well determine the direction of the sound source. In the horizontal direction, we determine the direction of the sound by the difference in phase and intensity of the sound, because the time or distance at which the sound reaches the two ears is different. The common stereo effect is achieved by hearing the different sounds recorded at different locations on the left and right ears, so there is a sense of direction. In real life, when the head turns, the direction of the sound heard changes. However, in the current VR system, the direction of the sound is independent of the movement of the user’s head.

Sensory feedback

In a VR system, the user can see a virtual cup. You can try to catch it, but your hand doesn’t really touch the cup and it’s possible to cross the “surface” of the virtual cup, which is impossible in real life. A common device for solving this problem is to mount some vibrating contacts on the inner layer of the glove to simulate the sense of touch.

voice

In VR systems, the input and output of speech is also important. This requires the virtual environment to understand the human language and interact with people in real time. It is quite difficult for a computer to recognize human speech because speech signals and natural language signals have “multilateralism” and complexity. For example, there is no obvious pause between words and words in continuous speech. The pronunciation of the same word and the same word is affected by the words and words before and after. Not only different people say that the same word will be different, that is, the same person’s pronunciation will also be psychologically Physiological and environmental effects vary.

There are two problems with the use of human natural language as a computer input. The first is efficiency. To facilitate computer understanding, the input speech may be quite embarrassing. The second is the question of correctness. The way computers understand speech is to compare and match, and no one is intelligent.

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Five major obstacles to the development of vr:

The future of virtual reality technology will develop into a new breakthrough that changes our way of life. At the developer conference of the first generation Oculus Rift, all participants saw a potential virtual reality platform.

But from now on, there is still a long way to go before virtual reality technology really enters the consumer market, including Oculus. Inside Oculus, the issues facing virtual reality technology are also discussed, and solutions are constantly being sought. Although all questions will eventually find the answer, it is unlikely to be resolved overnight.

At present, there are still some technical limitations in how developers can provide users with a truly immersive game or application experience, and some problems still have no good solution.

  1. There is no way to really enter the virtual world

  2. How to “enter” is a big problem

  3. Lack of uniform standards

  4. It is easy to feel tired

  5. Equipment is heavy and unsightly

The above is a brief introduction about what technology is vr. Through the introduction of this article, is there a preliminary understanding of vr?

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