@inproceedings{PB-VRVis-2019-031,
author = {Mohr, Peter and Tatzgern, Markus and Langlotz, Tobias and Lang, Andreas and Schmalstieg, Dieter and Kalkofen, Denis},
title = {TrackCap: Enabling Smartphones for 3D Interaction on Mobile
  Head-Mounted Displays},
year = {2019},
booktitle = {Proceedings of the 2019 CHI Conference on Human Factors in
  Computing Systems},
editor = {Brewster, Stephen and Fitzpatrick, Geraldine and Cox, Anna and
  Kostakos, Vassilis},
doi = {10.1145/3290605.3300815},
url = {https://www.vrvis.at/publications/PB-VRVis-2019-031},
publisher = {ACM},
isbn = {978-1-4503-5970-2},
pages = {585:1--585:11},
abstract = {The latest generation of consumer market Head-mounted displays  (HMD) now include self-contained inside-out tracking of head  motions, which makes them suitable for mobile applications.  However, 3D tracking of input devices is either not included  at all or requires to keep the device in sight, so that it can  be observed from a sensor mounted on the HMD. Both approaches  make natural interactions cumbersome in mobile applications.  TrackCap, a novel approach for 3D tracking of input devices,  turns a conventional smartphone into a precise 6DOF input  device for an HMD user. The device can be conveniently  operated both inside and outside the HMD's field of view,  while it provides additional 2D input and output capabilities.},
}