1. Multimedia
Virtual Reality
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2. Virtual Reality (VR) Definition
An artificial reality that projects you into a 3D space generated by the computer.
A virtual reality system usually uses:
Stereoscopic goggles that provide the 3D imagery.
Tracking device:
goggles that track head and body movement.
"data glove" that tracks hand movements.
The tracking device lets you point to and manipulate computer-generated objects displayed into the goggles.
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3. Degree of Interaction in VR
Solo – One person interacting in a virtual space.
Same Place Collaboration – Few users, interacting in a virtual space, in the same physical location.
Different Place Collaboration – Few users, interacting in a virtual space, but situated in different physical locations.
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4. Degree of Immersion in VR
Fully immersive VR applications (where one doesn't experience the surrounding physical and real environment);
Semi-immersive VR applications (where a certain degree of immersion is gained, for example via stereo projection);
2D screen renderings of a conceptually 3D space (as in Second Life).
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5. Degree of Realism in VR
A photo-realistic representation of a real physical location.
A representation of a conceptual university campus.
A metaphorical or fantasy environment such as a virtual zoo.
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6. VR Technical Approaches
Head-Mounted
Head-mounted wide-view stereo display.
Cave-based
Walls of a room are rear-projection stereo displays.
The user wears goggles to enable viewing in 3D.
Chameleon-type
Hand held, or hand moved, display.
Position and orientation are tracked.
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7. 1. Head Mounted Head Mounted Display (HMD) Boom Mounted Display
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8. Virtual Reality Environment
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9. Data Glove
The user can control images on the screen by donning a glove wired with numerous sensors and moving his hand through the air.
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10. Human, HMD and Gloves
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11. Schematic Relationship in HMD System
Eyes and display are tightly coupled.
Hands are “far” aside of the display.
Problem: hands and other objects are hidden.
Solution – use camera and Augmented virtuality/reality.
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12. CAVE = Computer Automatic Virtual Environment
2. Cave-based
CAVE = Computer Automatic Virtual Environment
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13. Various devices surround the CAVE
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14. CAVE examples
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15. CAVE example
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16. Degenerated CAVEs – examples
A small 3-sided cave (Cubby)
Cubby
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17. Degenerated CAVE
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18. Schematic Relationship in CAVE System
Eyes and hands are linked and mobile.
Display is fixed.
Problem “shadow effect”: when another person hides walls, or when an object is supposed to be between two persons.
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19. 3. Chameleon-type
Palm-held VR
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20. Chameleon Style Example
ART+COM
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21. Schematic Relationship in Chameleon System
Hands and display are tightly coupled.
All three are mobile.
Problems: all (of HMD and Cave).
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