Devices and Systems of Virtual

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14 Νοε 2013 (πριν από 3 χρόνια και 9 μήνες)

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2.03B Common Types and Interface
Devices and Systems of Virtual
Reality

2.03 Explore virtual reality.


Types of Virtual Realities

Types of Virtual Realities


Desktop


Uses 3
-
D Graphics


Does not require additional equipment.


Immersive


Requires additional equipment.


Is the most effective of Virtual Reality technologies.


Eyes, ears, or other body senses are isolated from real environment
and fed information that is generated by the computer.


Telepresence


Allows a person to interact with another live, real place at a different
physical location other than their actual location.


Involves life
-
size images.


In some situations, participants may be able to manipulate devices or
the environment in the remote location.

Common Interface Devices

Interface Devices

Head
-
mounted display
(HMD)



Facial sensor/body
suit


Interface Devices

Wand

Data glove

Head
-
Mounted Display
(HMD)


Device on top of helmet signals head movements.


A computer continually updates the simulation to
reflect new perspectives.


Its viewing screen adds depth to flat pictures.




Blocks out surrounding
environment.


Is popular with the entertainment
industry.

Data Glove

Programs the computer to change modes in response to gestures
made with data gloves.


Some use fiber optic cables.


Some use strain sensors over joints.

Facial sensor/body suit

Sensors read facial expressions/body movements and transfer
information to the computer for animation purposes.

Wand


Is simplest of interface devices.


Most have on/off buttons.


Some have knobs, dials, or joy sticks.


Wands operate with six degrees of freedom.


By pointing a wand at an object, its position and
orientation can be changed in any of six
directions


forward or backward, up or down, or
left or right


Example of Use: Biologists use wands like scalpels
to slice tissue samples from virtual brains.


Interface Systems

Interface Systems

Three common systems:


HMD


Head
-
mounted Display


BOOM


Binocular Omni Orientation
Monitor


CAVE


Automatic Virtual Environment

BOOM


(Binocular Omni Orientation Monitor)



Is similar to HMD


but no helmet.


Viewing box suspended from rotating arm.


Uses handles on box sides to move image
around.


Buttons on handles allow user to interact
with object.


Can also hook up data gloves.

CAVE


One of the newest, most "immersive" virtual
environments.


10 x 10 x 9
-
foot darkened cubicle.


Is like climbing into the computer’s screen.


Display enables user to experience the.
sensation of being "inside" the data.

Advantages of CAVE


Only need special glasses and
a

wand
instead of clunky equipment.


Has a large field of view of data that is
projected in stereoscopic images onto the
walls and floor of the CAVE.


Multiple users can be in CAVE at same time.


Sound can be added to images.

Shared Virtual
Environments


The users can see each
other, communicate with
each other, and interact with
the virtual world as a team.



In this illustration, three networked
users at different locations (anywhere in
the world) meet in the same virtual
world by using a BOOM device, a CAVE
system, and a Head
-
mounted Display.



All users see the same virtual
environment from their respective points
of view.



Each user is presented as a
virtual
human (avatar)

to the other
participants.

Review

Common virtual reality


Types


Interface devices


Interface systems