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Related Experiment Videos

Virtual trackballs revisited.

Knud Henriksen1, Jon Sporring, Kasper Hornbaek

  • 1Department of Computer Science, University of Copenhagen, Universitetsparken 1, DK-2100 Copenhagen, Denmark. kaiip@diku.dk

IEEE Transactions on Visualization and Computer Graphics
|September 24, 2004
PubMed
Summary
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This study corrects the Chen et al. virtual trackball for accurate 3D object rotation and analyzes Shoemake's and Bell's virtual trackball implementations, highlighting usability issues.

Area of Science:

  • Computer Graphics
  • Human-Computer Interaction
  • 3D Interaction

Background:

  • Virtual trackballs are widely used for 3D object rotation in CAD, simulations, and VR.
  • Common techniques include virtual trackballs operated by a mouse pointer.

Purpose of the Study:

  • To provide a mathematical foundation for virtual trackballs.
  • To review and analyze existing virtual trackball techniques.
  • To identify and correct inaccuracies in popular virtual trackball methods.

Main Methods:

  • Mathematical analysis of virtual trackball algorithms.
  • Comparison of Chen et al., Shoemake's, and Bell's virtual trackball implementations.
  • Review of usability studies on virtual trackballs.

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Main Results:

  • The Chen et al. virtual trackball was found to have inaccuracies in object rotation along great circular arcs; a correction is provided.
  • Shoemake's quaternion-based virtual trackball is a specific case of Chen et al.'s method but suffers from inhomogeneity and discontinuity.
  • Bell's virtual trackball is reviewed, and usability studies are discussed.

Conclusions:

  • Corrections to the Chen et al. virtual trackball improve rotation accuracy.
  • Shoemake's method has usability drawbacks despite its full-screen application.
  • Further research into virtual trackball usability is warranted.