10 -virtual_reality


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  • A good novel is immersive without any fancy graphics or audio hardware. You 'see' and 'hear' and 'touch' and 'taste' and 'smell' A good play or a film or an opera can be immersive using only sight and sound. But they aren't interactive which is another key element. Another key element of VR is a viewer centered perspective where you 'see' through your own eyes as you move through a computer generated space, interact with objects there, and more often than not kill everyone you meet. The way you see the environment is limited to a screen with a narrow angle of view and you use a keyboard / joystick / gamepad to change your view of that scene.
  • the visual (and aural and haptic) displays that immerse the user in the virtual world and that block out contradictory sensory impressions from the real world; the graphics rendering system that generates, at 20 to 30 frames per second, the ever-changing images; the tracking system that continually reports the position and orientation of the user’s head and limbs; and the database construction and maintenance system for building and maintaining detailed and realistic models of the virtual world.
  • The walls of the CAVE are made up of rear-projection screens, and the floor is made of a down-projection screen. High-resolution projectors display images on each of the screens by projecting the images onto mirrors which reflect the images onto the projection screens. The user will go inside of the CAVE wearing special glasses to allow for the 3-D graphics that are generated by the CAVE to be seen. With these glasses, people using the CAVE can actually see objects floating in the air, and can walk around them, getting a proper view of what the object would look like when they walk around it. This is made possible with electromagnetic sensors.
  • ergonomics  [.:gə'nɔmiks] latency  ['leitnsi]
  • traumatic  [trɔ:ˈmætik]
  • 10 -virtual_reality

    1. 1. Virtual Reality Yanci Zhang
    2. 2. What is Virtual Reality? <ul><li>A responsive virtual world in which the user is effectively immersed </li></ul><ul><li>Features </li></ul><ul><ul><li>Immersive </li></ul></ul><ul><ul><li>Interactive </li></ul></ul><ul><ul><li>Real time </li></ul></ul><ul><ul><li>Viewer centered </li></ul></ul>
    3. 3. Crucial Technologies <ul><li>Display system </li></ul><ul><li>Graphics rendering system </li></ul><ul><li>Tracking system </li></ul><ul><li>Virtual world construction and maintenance system </li></ul>
    4. 4. Display System <ul><li>Display technology advances very rapidly </li></ul><ul><li>VR display system must provide immersion </li></ul><ul><li>Desktop displays are not considered to be VR </li></ul><ul><ul><li>Hardly block out the real world </li></ul></ul><ul><ul><li>Do not present virtual world objects in life size </li></ul></ul><ul><ul><li>Do not create the illusion of immersion </li></ul></ul>
    5. 5. CAVE <ul><li>Cave Automatic Virtual Environment </li></ul><ul><li>An immersive virtual reality environment where projectors are directed to 3, 4, 5 or 6 of the walls of a room-sized cube </li></ul>
    6. 6. Head-Mounted Display <ul><li>Worn on the head or as part of a helmet </li></ul><ul><li>A small display optic in front of one or each eye </li></ul>
    7. 7. Panoramic Display <ul><li>Use multiply displays to provide wide view angle </li></ul><ul><li>Widely used in many applications </li></ul><ul><li>Challenge: geometry and color calibration </li></ul>
    8. 8. Tracking System <ul><li>Tracking observer’s body coordinate / head motion </li></ul><ul><li>Challenges: </li></ul><ul><ul><li>Accuracy </li></ul></ul><ul><ul><li>Ergonomics </li></ul></ul><ul><ul><li>System latency </li></ul></ul>
    9. 9. Augmented Reality <ul><li>Direct or indirect view of a physical real-world environment whose elements are augmented by virtual computer-generated sensory input </li></ul><ul><li>Enhance person’s perception of reality </li></ul>
    10. 10. Application: Wikitude <ul><li>The very first Augmented Reality Browser for smartphone-users </li></ul><ul><li>Scan surrounding using camera and device’s sensors </li></ul><ul><li>Objects’ information is displayed in the cam right where the real object is located </li></ul>
    11. 11. Mixed Reality <ul><li>Merge of real and virtual worlds to produce new environments and visualizations </li></ul><ul><li>Physical and digital objects co-exist and interact in real time </li></ul>
    12. 12. Application: Virtual therapy <ul><li>Psychologist treats soldiers with PTSD (Post Traumatic Stress Disorder) </li></ul><ul><li>PTSD: can not get over from bad things happened to him/her </li></ul><ul><li>Best way to treat PTSD: exposure therapy </li></ul><ul><ul><li>Go back to the bad thing </li></ul></ul><ul><ul><li>Go through it gently </li></ul></ul><ul><ul><li>Talk about what they were feeling </li></ul></ul>
    13. 13. Application: Virtual therapy
    14. 14. Application: Flat World <ul><li>Mixed reality application for military: combine virtual with real </li></ul><ul><li>Whole body get involved </li></ul><ul><li>4D effects: temperature, smell, sound… </li></ul><ul><li>Virtual characters can see you and react to your movement </li></ul><ul><li>You can have flat world in your own home </li></ul>
    15. 15. Application: Flat world
    16. 16. Assignments <ul><li>Group </li></ul><ul><ul><li>Group25: PC and MAC 15 </li></ul></ul><ul><ul><li>Group26: PC and MAC 16 </li></ul></ul><ul><ul><li>Group27: What is artificial intelligence? </li></ul></ul><ul><ul><li>Group28: What is expert system? </li></ul></ul><ul><li>Individual: </li></ul><ul><ul><li>Write an English article: Applications of artificial intelligence (>300 words) </li></ul></ul><ul><li>Deadline: 2010-11-22 </li></ul>