In immersive virtual environments (IVE), users' visual and auditory perception is replaced by computer-generated stimuli. Thus, knowing the positions of real objects is crucial for physical safety. While some solutions exist, e. g., using virtual replicas or visible cues indicating the interaction space boundaries, these are limiting the IVE design or depend on the hardware setup. Moreover, most solutions cannot handle lost tracking, erroneous tracker calibration, or moving obstacles. However, these are common scenarios especially for the increasingly popular home virtual reality settings.

In this project, we investigate different stand-alone hardware devices that can alert IVE users for potential collisions with real-world objects. For instance, we used distance sensors mounted on a head-mounted display (HMD) and vibro-tactile actuators inserted into the HMD's face cushion. We implemented different types of sensor-actuator mappings with the goal to find a mapping function that is minimally obtrusive in normal use, but efficiently alerting in risk situations.


D. Valkov, L. LinsenVibro-tactile Feedback for Real-world Awareness in Immersive Virtual Environments
VR '19: IEEE Conference on Virtual Reality and 3D User Interfaces, 340-349, 2019

K. Huesmann, D. Valkov, L. Linsen, RealityAlert: Improving Users' Physical Safety in Immersive Virtual Environments
SUI '18: Proceedings of the Symposium on Spatial User Interaction, 175-175, 2018