Taking steps

TLDR

The technique is suitable for applications where locomotion is restricted to ground level. The article presents an interactive walking‑in‑place technique for navigating immersive virtual environments, evaluates its effect on presence versus hand‑pointing, and demonstrates applications to climbing steps and ladders. The technique employs a neural network to detect walking in place from head‑mounted display coordinates and moves the user through virtual space in the gaze direction, thereby matching proprioceptive cues to visual feedback and enabling navigation beyond physical limits. The studies show that walking in place enhances subjective presence when participants identify with the virtual body.

Abstract

This article presents an interactive technique for moving through an immersive virtual environment (or “virtual reality”). The technique is suitable for applications where locomotion is restricted to ground level. The technique is derived from the idea that presence in virtual environments may be enhanced the stronger the match between proprioceptive information from human body movements and sensory feedback from the computer-generated displays. The technique is an attempt to simulate body movements associated with walking. The participant “walks in place” to move through the virtual environment across distances greater than the physical limitations imposed by the electromagnetic tracking devices. A neural network is used to analyze the stream of coordinates from the head-mounted display, to determine whether or not the participant is walking on the spot. Whenever it determines the walking behavior, the participant is moved through virtual space in the direction of his or her gaze. We discuss two experimental studies to assess the impact on presence of this method in comparison to the usual hand-pointing method of navigation in virtual reality. The studies suggest that subjective rating of presence is enhanced by the walking method provided that participants associate subjectively with the virtual body provided in the environment. An application of the technique to climbing steps and ladders is also presented.