Introduction to Virtual Reality (VR)
Virtual Reality (VR)literally makes it possible to experience anything, anywhere, anytime. It is the most immersive type of reality technology and can convince the human brain that it is somewhere it is really not. Head mounted displays are used with headphones and hand controllers to provide afully immersiveexperience. With the largest technology companies on planet earth (Facebook, Google, and Microsoft) currently investing billions of dollars intovirtual reality companies and startups, the future of virtual reality is set to be a pillar of our everyday lives.
A realistic three-dimensional image or artificial environment that is created with a mixture of interactive hardware and software, and presented to the user in such a way that the any doubts are suspended and it is accepted as a real environment in which it is interacted with in a seemingly real or physical way.
Virtual reality (also calledVirtual RealitiesorVR) is best understood by first defining what it aims to achieve total immersion.
Total immersion means that the sensory experience feels so real, that we forget it is a virtual-artificial environment and begin to interact with it as we would naturally in the real world. In a virtual reality environment, a completely synthetic world may or may not mimic the properties of a real-world environment. This means that the virtual reality environment may simulate an everyday setting (e.g. walking around the streets of London), or may exceed the bounds of physical reality by creating a world in which the physical laws governing gravity, time and material properties no longer hold (e.g. shooting space aliens on a foreign gravity-less planet).
Virtual reality immersionis the perception of being physically present in a non-physical world. It encompasses the sense ofpresence, which is the point where the human brain believes that is somewhere it is really not, and is accomplished through purely mental and/or physical means. The state oftotal immersionexists when enough senses are activated to create the perception of being present in a non-physical world. Two common types of immersion include:
Virtual reality requires as many of our senses as possible to be simulated. These senses include vision (visual), hearing (aural), touch (haptic), and more. Properly stimulating these sense requires sensory feedback, which is achieved through integrated hardware and software (also known as inputs). Examples of this hardware and inputs are discussed below as key components to a virtual reality system, which include head mounted displays (HMD), special gloves or hand accessories, and hand controls.
Several categories of virtual reality technologies exist, with more likely to emerge as this technology progresses. The various types of virtual reality differ in their levels of immersion and alsovirtual reality applications and use cases. Below, we explore a few of the different categories of virtual reality:
Virtual Reality NewsLatest Developments in Virtual Reality (VR) News
The field of augmented reality is continually growing with new technology advancements, software improvements, and products. Staying up to date with the latest augmented reality news is important to stay on top of this rapidly growing industry. We cover the latest inmixed reality news, augmented reality news, and virtual reality news.
In order for the human brain to accept an artificial, virtual environment as real, it has to not only look real, but also feel real. Looking real can be achieved by wearing a head-mounted display (HMD) that displays a recreated life size, 3D virtual environment without the boundaries usually seen on TV or a computer screen. Feeling real can be achieved through handheld input devices such as motion trackers that base interactivity on the users movements. By stimulating many of the same senses one would use to navigate in the real world, virtual reality environments are feeling increasingly more like the natural world. Below, we explore some of the key components to behind this system.
Virtual reality content, which is the what users view inside of a virtual reality headset, is equally important as the headset itself. In order to power these interactive three-dimensional environments, significant computing power is required. This is where PC (Personal Computer), consoles, and smartphones come in. They act as the engine to power the content being produced.
A head-mounted display (also called HMD, Headset, or Goggles) is a type of device that contains a display mounted in front of a users eyes. This display usually covers the users full field of view and displays virtual reality content. Some virtual reality head mounted displays utilize smartphone displays, including the Google Cardboard and Samsung Gear VR. Head-mounted displays are often also accompanied with a headset to provide for audio stimulation.
Inside of each virtual reality head-mounted display (HMD) is a series of sensors, individual eye displays, lenses, and display screen(s), among other various components. TheIfixit Oculus Rift teardownoffers an excellent step-by-step teardown and look inside of one of the most popular virtual reality headsets. Below we explore some of the key components inside of a virtual reality headset.
Image Source: MIT Technology Review
The three most common sensors in a virtual reality headset are magnetometers, accelerometers and gyroscopes. These sensors work together by measuring the users motions and direction in space. Their ultimate goal is to achieve true six-degrees-of-freedom (6DoF), which covers all the degrees of motion for an object in space.
Lenses lie between your eyes and pixels on the display screen(s). They focus and reshape the picture for each eye by angling two 2D images to mimic how each of our eyes take in views of the world (also called stereoscopic). This creates an impression of depth and solidity, which we perceive to be a three-dimensional image. Lenses on each virtual reality device are not one-size-fits all and have to be adjusted for initial use as all devices have different lens properties.
Display screens show the images that user view through the lenses. They are typically LCD and receive video feed from the computer or smartphone. Depending on the headset, the video feed is either sent to one display or two displays (one per eye). This happens via wireless connection, smartphone connection, or HDMI. The most common types of virtual reality display technology is a Liquid Crystal Display (LCD) screen, similar to the kinds used in smartphones and computer monitors. An alternative display technology is an Organic Light-Emitting Diode (OLED) screen.
Virtual reality systems demand a substantial amount of power, even in comparison to notoriously power hungry gaming systems. The processing power required by virtual reality systems can be broken down into several categories:
Field of view (also called Field of Vision or FOV) is an important component used in virtual reality to provide users with a realistic perception of their environmental landscape. Simply put, field of view refers to how wide the picture is. Field of view is measured based on the degree of display (e.g. 360). Most high-end headsets make do with 100 or 110 field of view which is sufficient for most virtual reality content.
Frame rate refers to the frequency (rate) at which the display screen shows consecutive images, which are also called frames. Television shows run at 30 frames per second (fps) and some game consoles run at 60 frames per second (fps). In virtual reality, a minimum frame rate of approximately 60 frames per second is needed to avoid content stuttering or cause of simulation sickness. The Oculus Rift runs at 90 fps, providing Oculus Rift users with a very lifelike experience. Future Frame rates for virtual reality headsets are set to inevitably continue getting faster, providing for a more realistic experience.
Latency refers to the amount of time it takes for an image displayed in a users headset to catch up to their changing head position. Latency can also the thought of as a delay, and is measured in milliseconds (ms). In order for an experience to feel real, latency usually needs to be in the range of 20 milliseconds (ms) or less. Low latency, or very little delay, is needed to make the human brain accept the virtual environment as real. The lower the latency, the better. The higher the latency, a noticeable and unnatural lag may set in, consequently causing simulation sickness for the user.
Virtual reality audio may not be as technically-complex as the visual components, however, it is an equally important component to stimulate a users senses and achieve immersion. Most virtual reality headsets provide users with the option to use their own headphones in conjunction with a headset. Other headsets may include their own integrated headphones. Virtual reality audio works via positional, multi-speaker audio (often called Positional Audio) that gives the illusion of a 3-dimensional world. Positional audio is a way of seeing with your ears and is used in virtual reality because it can provide cues to gain a users attention, or give them information that may not be presented visually. This technology is already quite common and often found in home theater surround sound systems.
Tracking handles the vital task of understanding a users movements and then acting upon them accordingly to maintain full immersion in virtual reality. Below, we explore the three of the main types of virtual reality tracking:
Head tracking refers to the way in which the view in front of you will shift as you look up, down and side-to-side. A system called six degrees of freedom (6DoF) plots your head in terms of your x, y and z axis to measure head movements forward and backwards, side-to-side and shoulder to shoulder, otherwise known as pitch, yaw and roll. Head tracking utilizes a series of sensors, vital to any virtual reality headset, which includes agyroscope,accelerometer, andmagnetometer. Head-tracking technology must be low latency in order to be effective. Anything above 50ms will cause a lag between the headset movement and virtual reality environment changes.
Motion tracking is the way in which you view and interact with your own body (e.g. hands, movements, etc). One of the most natural motion-related acts is to want to be able to see your own hands (virtually) in front of you. To do this, virtual reality input accessories such as gloves can be used. Other motion tracking devices such as wireless controllers, joysticks, treadmills, and motion platforms are now being used to supplement the headset and provide an even more immersive experience. Many of these input accessories utilize sensors to detect gestures such as pointing and waving. Virtual reality systems such as HTCs Vive headset, utilize base stations to track the sensors from the headset and controllers.
Eye tracking technology is still maturing, however, it may be one of the most important missing pieces to complete the virtual reality full immersion puzzle. Eye tracking involves tracking the human eyes via an infrared sensor that monitors your eye movement inside the headset. The main advantage to this type of tracking is that depth of field (i.e. distance) becomes much more realistic. In a virtual reality headset, the objects that our eyes focus on, need to look as life-like as possible. Without eye tracking, everything remains in focus as you move your eyes but not your head around a scene, thus causing a greater likeliness of simulation sickness.
It takes bold visionaries and risk-takers to build future technologies into realities. In the field of virtual reality (VR), there are many companies across the globe working on this mission. Our mega list of mixed reality, augmented reality and virtual reality companies covers the top companies and startups who are innovating in this space.
A well established example of virtual reality already in use is in the field of aviation training. From flying a commercial airplane out of a crowded international airport, to training for a dangerous night-flight using only night vision, virtual reality can provide significant benefits to aspiring pilots.
Piloting commercial flights require taking on tremendous responsibility, as there are often several hundred passengers on any given flight. Training for this responsibility requires both conceptual and hands on training.The initial hands on training can often be supplemented by use of a simulator.These simulators, which employ sophisticated computer models, use virtual reality to recreate what a pilot should expect when they actually flying. Simulators even use hydraulics to recreate the feeling of takeoff and landing. The benefit to using avirtual reality flight simulatoris that this all takes place in a controlled environment, which is forgiving to mistakes and pose virtually no risk.
Almost every flight by an active military pilot can be a life threatening mission. Training to become a military pilot requires unique skillsets and knowledge of how to react in uncertain situations. Almost all branches of them military, including the Air Force, Army, and Navy, now use virtual reality technologies to train pilots. By using virtual reality, soldiers are taught how to fly in battle, how to handle emergencies and recover fast, and how to coordinate air support with ground operations. Since simulators often have visual acuity over the entire 360-degree field of view, these simulators provide trainees with very deep levels of immersion. As mentioned above, the benefit to using a virtual reality flight simulator is that this all takes place in a controlled environment, which is forgiving to mistakes and poses virtually no risk.
Virtual Reality is only one pillar of reality technologies. Further explore the depth of these technologies by continuing with one of our other Ultimate Guide to Understanding web resources on Mixed Reality or AugmentedReality.
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