Category Archives: Computer Graphcis

A Virtual Reality Perceptual Study of Multi-Technique Redirected Walking Method

Within virtual reality experiences, locomotion methods manage the user’s movement within the virtual environment. The use of natural locomotion, common in virtual reality, can be limited in video games with large scenarios. Thus, video games with gamepad or teleport-based locomotion methods are gaining importance. Redirected walking methods focus on maximizing the exploitation of the real workspace. As the user moves in the real environment, subtle modifications are applied to that movement within the virtual environment. Although the results of the Multi-Technique Redirected Walking (MTRW) method that combines the application of four gain algorithms are promising, a perceptual evaluation with users is needed to determine its suitability. This article presents the perceptual evaluation of the presence and cybersickness factors for the MTRW method, comparing it with a Fully Natural Walking (FNW) method. The presence factor was measured with the Igroup Presence Questionnaire (IPQ), and no significant differences in the overall presence score were detected between the FNW and the MTRW methods. The cybersickness factor was measured using the Simulator Sickness Questionnaire (SSQ) and, this time, significant differences in cybersickness between the two locomotion methods were obtained. The potential increase in cybersickness should be weighed against the benefit of maximizing workspace utilization.

https://ieeexplore.ieee.org/document/10713064

About Jesús Mayor

Jesús Mayor is since 2019 a full-time lecturer and researcher in Politécnica de Madrid University. He received MS degree in Computer Science (CEU San Pablo, 2013), MS degree in Computer Graphics (U-tad, 2014) and PhD degree in Computer Science (Rey Juan Carlos University, 2020) in Madrid. His studies are focused on computer graphics and data science

Virtual Reality Presence in Partially Non-Euclidean Environments

Currently, virtual reality is limited by a physical workspace if the user walks indefinitely inside its virtual world. Therefore, it is necessary to find solutions to this limitation. A possible solution could be to reuse this workspace by overlapping different parts of the virtual space. This can be achieved through the use of imperceptible portals that connect different points in the virtual environment. Thanks to these portals it is possible to create a momentary break in the conventional Euclidean geometry displaying parts of the virtual world that are farther away than usual. Although this kind of effect has been seen in conventional games, its application to virtual environments has some technical implications. One of the most important technical characteristics to be evaluated is the presence, which could be affected by this type of visual effect. For this reason, a validation of the effect has been carried out by quantitatively analyzing the perceptual presence and conducting qualitative interviews with users. The results did not show an overall impact on presence, and users were excited to experience this type of visual effect inside the virtual world. Finally, this paper shows everything learned in this development and is discussed from a perceptual design point of view, opening the possibility of new studies associated with this visual effect applied to the virtual world.

https://doi.org/10.1162/pres_a_00419

About Jesús Mayor

Jesús Mayor is since 2019 a full-time lecturer and researcher in Politécnica de Madrid University. He received MS degree in Computer Science (CEU San Pablo, 2013), MS degree in Computer Graphics (U-tad, 2014) and PhD degree in Computer Science (Rey Juan Carlos University, 2020) in Madrid. His studies are focused on computer graphics and data science