Virtual Reality


What is VR?

Virtual reality (VR) is a brand new user interface unlike the conventional one, immersing a person in digital 3D environment, instead of watching on a display. Computer-generated imagery and content aim at simulating a real presence through senses (sight, hearing, touch).
Virtual reality simulation requires two main components: a source of content and a user device. Software and hardware, in other words. Currently such systems include headsets, all-directions treadmills, special gloves, goggles. VR tools should be providing realistic, natural, high-quality images and interaction possibilities. For this, devices rely on measurements like:
The main challenge of VR is tricking the human brain into perceiving digital content as real. That is not easy, and this “immersion” issue is what still holds virtual reality experiences back from being enjoyable. For example, the human visual field doesn’t work like a video frame, and besides about 180 degrees of vision, we also have a peripheral vision.
Yet, the VR visionaries are confident of overcoming such issues sooner or later, campaigning for the concept and collecting investments in millions. The virtual experience like 360-degree videos and pictures, VR apps and games, are already available. There’s a good enough choice of headsets as well

How does virtual reality work?

As mentioned, VR requires several devices such as a headset, a computer/smartphone or another machine to create a digital environment, and a motion tracking device in some cases. Typically, a headset displays content before a user’s eyes, while a cable (HDMI) transfers images to the screen from a PC. The alternative option is headsets working with smartphones, like Google Cardboard and GearVR – a phone acts both as a display and a source of VR content.
Some vendors apply lenses to change flat images into three-dimensional. Usually, a 100/110-degree field of sight is achieved with VR devices. The next key feature is the frame rate per second, which should be 60 fps at a minimum to make virtual simulations look realistically enough.

For user interaction there are several options:
Head tracking system in VR headsets follows the movements of your head to sides and angles. It assigns X, Y, Z axis to directions and movements, and involves tools like accelerometer, gyroscope, a circle of LEDs (around the headset to enable the outside camera). Head tracking requires low latency, i.e. 50 milliseconds or less, otherwise, users will notice the lag between head movements and a simulation.
Some headsets contain an infrared controller which tracks the direction of your eyes inside a virtual environment. The major benefit of this technology is to get a more realistic and deeper field of view.
Though not engineered and implemented well enough yet, motion tracking would raise VR to a totally new level. The thing is, that without motion tracking you’d be limited in VR – unable to look around and move around. Through concepts of the 6DoF (six degrees of freedom) and 3D space, options to support motion tracking fall into 2 group, optical and non-optical tracking. Optical tracking is typically a camera on a headset to follow the movements, while non-optical means the use of other sensors on a device or a body. Most of existing devices actually combine both options.

VR/AR/MR: what’s the difference?

Knowing what is VR is not the full picture of tech world today. Virtual and Augmented Realities are very similar and often the line between them is very thin. AR appends the real environment with a simulated one, overlaid on top. Augmented Reality applies algorithms and sensors to detecting the position of camera, and then superimposes 3D graphics/objects into user’s view via smartphones/glasses/projections.
One of the ways to describe the difference between VR and AR is to compare scuba diving and visiting the aquarium.Virtual Reality would be like swimming in the sea along with fish, while in Augmented Reality you’d see a fish popping out of a pocket or a hand. On the other hand, unlike VR, AR offers users more freedom of action and doesn’t require a head-mounted display.
The term “mixed reality” is often mistaken for augmented reality. But actually, MR (or hybrid reality) is a more sophisticated kind of technology, where AR is a subcategory of it. It includes non-commercial applications like military simulation-based learning programs, virtualization environments for manufacturing, healthcare, aviation, etc.

Major VR market players

The number one is, of course, Oculus Rift virtual reality headset. It is a small, well-crafted device, requiring a connection to a computer. A user can either sit or stand while playing a game, though is somewhat limited in movements. With dozens of thousands of units being sold each year, Oculus stays at the forefront of VR hardware niche.

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