Moving ahead with peephole pointing: modelling object selection with head-worn display field of view limitations

Barrett Ens, David Ahlström, Pourang Irani

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

10 Citations (Scopus)


Head-worn displays (HWDs) are now becoming widely available, which will allow researchers to explore sophisticated interface designs that support rich user productivity features. In a large virtual workspace, the limited available field of view (FoV) may cause objects to be located outside of the available viewing area, requiring users to first locate an item using head motion before making a selection. However, FoV varies widely across different devices, with an unknown impact on interface usability. We present a user study to test two-step selection models previously proposed for 'peephole pointing' in large virtual workspaces on mobile devices. Using a CAVE environment to simulate the FoV restriction of stereoscopic HWDs, we compare two different input methods, direct pointing, and raycasting in a selection task with varying FoV width. We find a very strong fit in this context, comparable to the prediction accuracy in the original studies, and much more accurate than the traditional Fitts' law model. We detect an advantage of direct pointing over raycasting, particularly with small targets. Moreover, we find that this advantage of direct pointing diminishes with decreasing FoV.

Original languageEnglish
Title of host publicationSUI'16 - Proceedings of the 2016 Symposium on Spatial User Interaction
Subtitle of host publicationOctober 15-16, 2016 Tokyo, Japan
EditorsRobert Teather, Evan Suma, Kyle Johnsen
Place of PublicationNew York NY USA
PublisherAssociation for Computing Machinery (ACM)
Number of pages4
ISBN (Electronic)9781450340687
Publication statusPublished - 2016
Externally publishedYes
EventSymposium on Spatial User Interaction 2016 - Tokyo, Japan
Duration: 15 Oct 201616 Oct 2016
Conference number: 4th


ConferenceSymposium on Spatial User Interaction 2016
Abbreviated titleSUI 2016
Internet address


  • Field of view
  • Fitts' law
  • FoV
  • Head-worn display
  • Hmd
  • HWD
  • Modelling
  • Peephole pointing

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