Virtual reality Ats Kurvet Definition Virtual Reality a three - - PowerPoint PPT Presentation

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Nov 15, 2022 26 likes •202 views

Virtual reality Ats Kurvet Definition Virtual Reality a three dimensional, computer generated simulation in which one can navigate around, interact with, and be immersed in another environment. (John Briggs - The Futurist) Virtual

SLIDE 1

Virtual reality

Ats Kurvet

SLIDE 2

Definition

Virtual Reality — a three dimensional, computer

generated simulation in which one can navigate around, interact with, and be immersed in another environment. (John Briggs - The Futurist)

Virtual Reality — the use of computer technology

to create the effect of an interactive three- dimensional world in which the objects have a sense of spatial presence. (Steve Bryson - NASA Ames)

SLIDE 3

Augmented reality

https://www.f35.com/about/capabilities/helmet

SLIDE 4

Presence & perception

Presence is the feeling of really being

someplace else.

Different barriers of entry for different people.

SLIDE 5

Technical requirements for presence

6 degrees of freedom movement

– rotational accuracy < ¼ degrees – Translational accuracy < 1mm – rock –solid tracking

> 90 frames per second

– low pixel persistence < 3ms

< 20ms latency – motion-to-photon time
> 1k resolution per eye
> 110 degree field of view
Calibrated, quality optics

SLIDE 6

http://www.destructoid.com/crescent-bay-gives-me-hope-for-the-consumer-oculus-rift-283475.phtml

SLIDE 7

Tracking

Inertial Measurement Unit at 1kHz
gyroscope
magnetometer
accelerometer

– Can not do absolute tracking

Tracking camera

– 60Hz – 19ms latency, 2ms for vision processing – Absolute tracking combined with IMU data and predictions

SLIDE 8

Low persistence

Rolling shutter

– 3ms band of light moving across the screen from right to left – Temporal offset for eyes

Global display would be nice.

SLIDE 9

Resolution and field of view

SLIDE 10

Optical distortion correction

SLIDE 11

Optical distortion correction example

SLIDE 12

Timewarp

Reproject frame before sending it to the

display.

17 m s Game Draw GPU

Input Sample (t=1ms)

Latency: 17ms – 4ms = 3ms

Pre-rendering Sample (t=5ms)

Time Warp Sample (t=14ms) Unreal engine integration

SLIDE 13

Audio

Binaural audio
Oculus licensed

RealSpace 3D Audio by Visisonics

– Uses head-related transfer function.

http://www.neumann.com/? lang=en&id=current_microphones&cid=ku100_description

SLIDE 14

Input

Unsolved with no clear end goal

in sight

– Track what and how – Latency – Haptic feedback

Optical vs magnetic vs

something else?

SLIDE 15

Design considerations

Design for what input?
Stairs are bad and other cases of motion sickness.
Sitting experience/limited movement.
Social interaction
Sprites look bad so do normal maps
Performance is at a premium
Design visuals around lower resolution
Uncanny valley
Use real world dimensions

SLIDE 16

Cave Automatic Virtual Environment

SLIDE 17

Sources & Extras

http://design.osu.edu/carlson/history/lesson17.html
http://media.steampowered.com/apps/abrashblog/MAbrash%20GDC2013.pdf
https://de45xmedrsdbp.cloudfront.net/Resources/files/UE4-Integration-and-Demos_OC-100270768.pptx
http://doc-ok.org/?p=1057
http://www.roadtovr.com/what-does-it-look-like-in-the-oculus-rift/