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Swimming Across the Pacific

Swimming Across the Pacific. By Tzu-Pei Grace Chen for Dr. Sid Fels Human Communications Technology Lab, UBC. Outline of the Talk. Motivations Implementation and modification Synchronizing Conclusion Future work. Why Swim Across the Pacific?. Artistic reason Scientific motivations.

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Swimming Across the Pacific

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  1. Swimming Across the Pacific By Tzu-Pei Grace Chen for Dr. Sid Fels Human Communications Technology Lab, UBC

  2. Outline of the Talk • Motivations • Implementation and modification • Synchronizing • Conclusion • Future work

  3. Why Swim Across the Pacific? • Artistic reason • Scientific motivations

  4. Artistic Reason • “Swimming Across the Atlantic” (1982) by Alzek Misheff • Almost 20 years later: Swim Across the Pacific • The problem: how do you swim in a plane?

  5. The Solution • Swim in virtual reality • Swimming cage bolted in a plane • All passengers wear head-mounted displays

  6. Scientific Motivations • Virtual swimming - not well investigated • Previous work • walking/running e.g. Sarcos Treadport • flying/hang-gliding e.g. Dreamality • bicycling e.g. Peloton, Trike • Virtual swimming? • e.g. Aquacave and Virtual Diver

  7. Issues • Swimming at the water surface level • swimmer moves in and out of air and water • requires rapid changes of the synthetic environment • How do you simulate the feel of water? • wetness, more resistance, can’t breath it

  8. Implementation of SAP • Two major components: • swimming cage • graphic system • Only considering front crawl and butterfly • Video clips of the current system • Discuss of implementation in more details later

  9. The Swimming Cage

  10. Modifications Made

  11. The Virtual Swimming Environment

  12. Linking the Real and the Virtual • Polhemus fast track sensors for the limbs • Head-mounted displays for the eyes • Tcl/tk interface for user calibration and adjustment

  13. Sensor Synchronizing • Each sensor gives position x, y, z and orientation yaw, pitch and roll • Implemented sensor data mappings for the legs, the eyes and the arms • Avatar made of spheres and rectangular prisms with embedded angles

  14. The View Point / The eyes • Involves finding the vectors for camera orientation • Yaw, pitch and roll with respect to world coordinates not sensor coordinates

  15. The Legs

  16. The Arms • S, W and E forms a triangle • Find use the cosine rule • Find use the sine rule

  17. The Arm • A cone of possible solutions • Specify the solution to lie in the plane of SW and z-vector

  18. Conclusion • Current SAP system still in infant stage • design may suffice performance art • has deeper scientific implications and research values • Realist feel of water rely on advancement in haptic, olfactory and gustatory devices • Large hurdle because swimmer is in air and water

  19. Future Work • More realistic rendering of the VE • landmarks & sea creatures • 3-D waves and water splashing effects • Tcl/tk interface for calibration • Mechanics • accommodate s-shape of arm strokes • additional sensors; cordless even better • Move into the Cave

  20. The End

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