Displays | CAVE and HMDs

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En provenance du cours de University of London

Introduction to Virtual Reality

215 notes

University of London

Introduction to Virtual Reality

215 notes

Cours 1 sur 5 dans Specialization Virtual Reality

This course will introduce you to Virtual Reality (VR). The course will teach you everything from the basics of VR- the hardware and the history of VR- to different applications of VR, the psychology of Virtual Reality, and the challenges of the medium. The course is designed for people who are new to VR as a medium. You may have experienced some virtual reality before, and may have some hardware- but this course is suitable to individuals who have never experienced VR and those who do not have much hardware- we will explain Mobile VR as well as devices such as the Oculus Rift and HTC Vive. Introduction to Virtual Reality is the first course in the Virtual Reality Specialisation. A learner with no previous experience in Virtual Reality and/or game programming will be able to evaluate existing VR applications, and design, test, and implement their own VR experiences/games using Unity by the end of the specialisation.

À partir de la leçon

Virtual Reality- Hardware and History

In this week, we’ll cover the basics of VR. We’ll start by sharing a definition of Virtual Reality, and exploring VR hardware, and then you’ll see demonstrations of a range of VR Head Mounted Devices. In the latter part of the week, you will hear more about the history of Virtual Reality and finish the week by drafting your ideas for a VR application.

What is VR and How is it Different from Other Media?5:28

Displays | CAVE and HMDs3:33

Head Tracking5:46

Controllers5:58

Choosing your VR Device5:27

HMD | Oculus Rift1:57

HMD | HTC Vive3:11

HMD | Sony PlayStation VR4:23

HMD | Mobile VR | Google Cardboard and Samsung Gear2:59

CAVE VR Systems8:28

Rencontrer les enseignants

Dr Sylvia Xueni Pan
Lecturer, Department of Computing
Goldsmiths, University of London
Dr Marco Gillies
Senior Lecturer
Computing Department, Goldsmiths, University of London

[MUSIC]

In this video, we will compare two different VR display systems,

the CAVE and HMD.

In the previous video, we talked about the Oculus Rift, which is one of

the most popular head mounted displays or HMD's currently on the market.

We will spend lots of time on the technical features of

HMD's later this week.

But before then, I'd like to talk about a similar system

that is less known to the public, the CAVE.

The CAVE refers to a cave automatic virtual environment.

It normally looks like this, just an empty room with at least four display walls.

That's three walls around you, plus the floor.

There are projectors behind the walls to project high resolution images.

In order to perceive 3D stereo vision, the user would wear a pair of shutter glasses.

So at any given time, they only see through one of their glasses.

The displays are synced to the shutter glasses, so

they will produce images that are for the correct eye at the correct moment.

And this switches at least 60 times per second to produce

the illusion of 3D stereo vision, similar to HMDs.

In the CAVE, we also have user dynamic control of view point.

This is achieved by attaching the head tracking device

on top of the shutter glasses, and

updating the display in realtime according to the viewpoint of the user.

So although you can probably have more than one user standing in the space,

each wearing a pair of shutter glasses, only one of them could be wearing the head

tracking device that is synced to the machine that renders the graphics.

This will be the only person who has the dynamic control of view point.

For other users, the display could feel a bit distorted.

Finally, because of the four surrounding walls, the user feels that they

are surrounded by the computer generated images rather than the real world.

Again, all three features contribute to the immersive VR experience.

In summary, the CAVE is designed to be used by a single user

whose head position will be tracked.

It takes a large and dedicated space.

It's normally set up as a fixture in research labs in both academia and

industry.

And truly, you can't carry your CAVE system with you.

Because of the size of the display, you could have very high resolution, but

you will need powerful machines to drive that.

Both CAVEs and HMDs are designed for single users.

You can have VR applications with multiple users, but

each one will need their own display device, that is, either a CAVE or HMD.

The CAVEs have a big screen with high resolution.

In comparison, the HMD is currently much lower in their resolutions.

The CAVEs take a large and dedicated space,

while the HMDs are more flexible in their space requirements.

[MUSIC]

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