GoGo Interaction on a Virtual Reality Workbench

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Go-Go Interaction on aVirtual Reality Workbench

• Berend Wouda
• (Group 32)

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Contents

• Introduction
• Implementation
• Results
• Conclusion
• Questions

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Introduction

• Virtual Reality Laboratory
• IVR Interactive Virtual Reality. A (Python)
  library to quickly and easily program for the
  Virtual Reality tools.
• Workbench Table-like Virtual Reality device
  with headtrackers and styli.
• Interaction
• Metaphors
• Direct Manipulation
• Raycasting
• World In Miniature
• Go-Go

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Introduction Go-Go (1)

• Originally described by I. Poupyrev et al.
• Polar coordinate space with origin at the users
  chest. The radius position is calculated from the
  users arm length through the Go-Go function.

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Introduction Go-Go (2)

• Advantages
• Local manipulation
• Easy to bring objects to you
• Disadvantages
• Finite range
• Setup step

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Implementation (1)

• Python
• ivrInteractorBase Base class to extend.
• ivrInteractor Raycast class used as reference.
• Differences from original paper
• No polar coordinate system, but scaling from the
  origin.
• Headtracker used to calculate origin prevents
  setup step.

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Implementation (2)

• Go-Go function
• def gogoFunction(self, length) if(length lt
  self.D) scale length else
  scale length self.k ((length - self.D)
  2.0)return scale
• Extra Cursor
• Boundary

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Results (1)

• Non-linear mapping makes cursor hard to find.
• Stylus rotation causes object translation.
• Linear interaction space moves with the user.
• Glass plate hard to exactly reach.
• Glass plate limits range.

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Results (2)

• Useful for PowerWall.
• Boundaries are a nice visual indicator.
• Extra cursor useful in off-bench rendering.
• Go-Go Function parameters D20 and k0.1 work
  well on the workbench.

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Results (3)

• Users liked the behaviour of the interactor.
• Natural feel, different from raycasting
• Easy manipulation
• Objects can be easily retrieved towards the user
• Additions were well recieved
• Tracked origin very nice
• Visual aids appear helpful

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Conclusion

• Implementation still rough
• Advantages
• Natural, useful as general technique
• Additions are useful
• Finite range not too bothersome on Workbench
• Disadvantages
• Translation through rotation
• Interference of Workbench surface

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Questions!