Swimming Across the Pacific By Tzu-Pei Grace Chen for Dr. Sid Fels Human Communications Technology...
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Transcript of Swimming Across the Pacific By Tzu-Pei Grace Chen for Dr. Sid Fels Human Communications Technology...
Swimming Across the Pacific
By Tzu-Pei Grace Chen for Dr. Sid FelsHuman 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
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?
The Solution
• Swim in virtual reality• Swimming cage bolted in a plane• All passengers wear head-mounted
displays
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
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
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
The Swimming Cage
Modifications Made
The Virtual Swimming Environment
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
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
The View Point / The eyes
• Involves finding the vectors for camera orientation
• Yaw, pitch and roll with respect to world coordinates not sensor coordinates
The Legs
)cos(2222 bccba
The Arms
• S, W and E forms a triangle• Finduse the cosine rule• Finduse the sine rule
The Arm
• A cone of possible solutions• Specify the solution to lie in the
plane of SW and z-vector
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
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
The End