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Hans Gellersen

Outline Pursuits: Gaze-assisted Selection of Occluded Objects in Virtual Reality

Research output: Contribution to book/anthology/report/proceedingArticle in proceedingsResearchpeer-review


  • Ludwig Sidenmark, Lancaster University
  • ,
  • Christopher Clarke, Lancaster University
  • ,
  • Xuesong Zhang, Lancaster University
  • ,
  • Jenny Phu, Ludwig Maximilian University of Munich
  • ,
  • Hans Gellersen

In 3D environments, objects can be difficult to select when they overlap, as this affects available target area and increases selection ambiguity. We introduce Outline Pursuits which extends a primary pointing modality for gaze-assisted selection of occluded objects. Candidate targets within a pointing cone are presented with an outline that is traversed by a moving stimulus. This affords completion of the selection by gaze attention to the intended target's outline motion, detected by matching the user's smooth pursuit eye movement. We demonstrate two techniques implemented based on the concept, one with a controller as the primary pointer, and one in which Outline Pursuits are combined with head pointing for hands-free selection. Compared with conventional raycasting, the techniques require less movement for selection as users do not need to reposition themselves for a better line of sight, and selection time and accuracy are less affected when targets become highly occluded.

Original languageEnglish
Title of host publicationCHI 2020 - Proceedings of the 2020 CHI Conference on Human Factors in Computing Systems
Number of pages13
Place of publicationNew York
PublisherAssociation for Computing Machinery
Publication year2020
Article number3376438
ISBN (Electronic)9781450367080
Publication statusPublished - 2020
Event2020 ACM CHI Conference on Human Factors in Computing Systems, CHI 2020 - Honolulu, United States
Duration: 25 Apr 202030 Apr 2020


Conference2020 ACM CHI Conference on Human Factors in Computing Systems, CHI 2020
LandUnited States
SeriesConference on Human Factors in Computing Systems - Proceedings

    Research areas

  • eye tracking, occlusion, smooth pursuits, virtual reality

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