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About

About

Graduated in Systems and Informatics Engineering at Minho University in 1998. During his PhD he researched in the area of 3D reconstruction from Images divided between Philips Research, Eindhoven, and Minho University, until he concluded in 2006.

He worked in the industry in the field of interactive systems, until he joined FEUP as Invited Assistant Professor in 2009, in the Department of Informatics Engineering (FEUP), to teach and research in the areas of Computer Graphics, Interaction and Game design and development.

He is a collaborator at INESC TEC/INESC Porto since 2011. Currently he is also the director of the Multimedia Masters of University of Porto, and responsible by the Graphics, Interaction and Gaming (GIG) Lab at DEI/FEUP.

Details

Details

  • Name

    Rui Pedro Rodrigues
  • Role

    Senior Researcher
  • Since

    01st November 2011
006
Publications

2024

Cues to fast-forward collaboration: A Survey of Workspace Awareness and Visual Cues in XR Collaborative Systems

Authors
Assaf, R; Mendes, D; Rodrigues, R;

Publication
COMPUTER GRAPHICS FORUM

Abstract
Collaboration in extended reality (XR) environments presents complex challenges that revolve around how users perceive the presence, intentions, and actions of their collaborators. This paper delves into the intricate realm of group awareness, focusing specifically on workspace awareness and the innovative visual cues designed to enhance user comprehension. The research begins by identifying a spectrum of collaborative situations drawn from an analysis of XR prototypes in the existing literature. Then, we describe and introduce a novel classification for workspace awareness, along with an exploration of visual cues recently employed in research endeavors. Lastly, we present the key findings and shine a spotlight on promising yet unexplored topics. This work not only serves as a reference for experienced researchers seeking to inform the design of their own collaborative XR applications but also extends a welcoming hand to newcomers in this dynamic field.

2023

Examining the Impact and Moderating Effects of an 8-Week Mindfulness-Based Program in Grade 4

Authors
Limpo, T; Vieira, AI; Magalhaes, S; Rocha, R; Cordeiro, C; Rodrigues, R; Coelho, A; Nobrega, R; Jacob, J; Cardoso, P; Pinheiro, M; Castro, S;

Publication
MINDFULNESS

Abstract
ObjectivesThere is a growing interest in mindfulness-based programs. Yet, research in the area is limited, and little is known about the factors that moderate the effects of these programs. The two-fold aim of this study was (1) to examine the effects of a mindfulness-based program on dispositional mindfulness, inattention and emotional lability, handwriting fluency, spelling accuracy, and composing quality, as well as school achievement; and (2) to evaluate the moderating role of lesson absences, intervention-related knowledge, and social validity.MethodUsing a quasi-experimental design, 257 fourth graders were assigned to an experimental group receiving a mindfulness-based program (n = 130) or an active control group receiving a health-based program (n = 127). Both programs were implemented in the classroom for 8 weekly units, which included two 30-min sessions delivered by psychologists, followed by three 5-min sessions delivered by teachers. All children were evaluated before and after the programs.ResultsCompared to the control condition, the mindfulness-based program resulted in higher levels of internal and external awareness, and decentering and nonreactivity, as well as better composing quality and mathematics grades. Lesson absences, intervention-related knowledge, and social validity did not moderate the effects of the mindfulness-based program.ConclusionsThese findings support the integration of mindfulness practices in primary school as a means to improve children's academic-related skills and ability to be mindful.

2023

Shape-A-Getti: A haptic device for getting multiple shapes using a simple actuator

Authors
Barbosa, F; Mendes, D; Rodrigues, R;

Publication
COMPUTERS & GRAPHICS-UK

Abstract
Haptic feedback in Virtual Reality is commonly provided through wearable or grounded devices adapted to specific scenarios and situations. Shape-changing devices allow for the physical representation of different virtual objects but are still a minority, complex, and usually have long transformation times. We present Shape-a-getti, a novel ungrounded, non-wearable, and graspable haptic device that can quickly change between different radially symmetrical shapes. It uses a single actuator to rotate several identical poles distributed along a radius to render the different shapes. The format of the poles defines the possible shapes, and in our prototype, we used one that could render concave, straight, and convex shapes with different radii. We conducted a user evaluation with 21 participants asking them to recognize virtual objects by grasping the Shape-a-getti. Despite having difficulties distinguishing between some objects with very similar shapes, participants could successfully identify virtual objects with different shapes rendered by our device. (c) 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

2023

SIT6: Indirect touch-based object manipulation for DeskVR

Authors
Almeida, D; Mendes, D; Rodrigues, R;

Publication
COMPUTERS & GRAPHICS-UK

Abstract
Virtual reality (VR) has the potential to significantly boost productivity in professional settings, especially those that can benefit from immersive environments that allow a better and more thorough way of visualizing information. However, the physical demands of mid-air movements make it difficult to use VR for extended periods. DeskVR offers a solution that allows users to engage in VR while seated at a desk, minimizing physical exhaustion. However, developing appropriate motion techniques for this context is challenging due to limited mobility and space constraints. This work focuses on object manipulation techniques, exploring touch-based and mid-air-based approaches to design a suitable solution for DeskVR, hypothesizing that touch-based object manipulation techniques could be as effective as mid-air object manipulation in a DeskVR scenario while less physically demanding. Thus, we propose Scaled Indirect Touch 6-DOF (SIT6), an indirect touch-based object manipulation technique incorporating scaled input mapping to address precision and out-of-reach manipulation issues. The implementation of our solution consists of a state machine with error-handling mechanisms and visual indicators to enhance interaction. User experiments were conducted to compare the SIT6 technique with a baseline mid-air approach, revealing comparable effectiveness while demanding less physical exertion. These results validated our hypothesis and established SIT6 as a viable option for object manipulation in DeskVR scenarios. (c) 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

2023

TouchRay: Towards Low-effort Object Selection at Any Distance in DeskVR

Authors
Monteiro, J; Mendes, D; Rodrigues, R;

Publication
2023 IEEE INTERNATIONAL SYMPOSIUM ON MIXED AND AUGMENTED REALITY, ISMAR

Abstract
DeskVR allows users to experience Virtual Reality (VR) while sitting at a desk without requiring extensive movements. This makes it better suited for professional work environments where productivity over extended periods is essential. However, tasks that typically resort to mid-air gestures might not be suitable for DeskVR. In this paper, we focus on the fundamental task of object selection. We present TouchRay, an object selection technique conceived specifically for DeskVR that enables users to select objects at any distance while resting their hands on the desk. It also allows selecting objects' sub-components by traversing their corresponding hierarchical trees. We conducted a user evaluation comparing TouchRay against state-of-the-art techniques targeted at traditional VR. Results revealed that participants could successfully select objects in different settings, with consistent times and on par with the baseline techniques in complex tasks, without requiring mid-air gestures.

Supervised
thesis

2023

Immersive and collaborative web-based 3D design review

Author
Rodrigo Assaf

Institution
UP-FEUP

2023

Object Manipulation in Desk VR

Author
Diogo Henrique Pinto de Almeida

Institution
UP-FEUP

2023

Virtual mixing ambisonics audio system

Author
Henrique José de Castro Ferreira

Institution
UP-FEUP

2023

Material Changing Haptics for VR

Author
Henrique Melo Ribeiro

Institution
UP-FEUP

2023

Natural Interaction in Smartphone Virtual Reality Experiences

Author
Leonor Martins de Sousa

Institution
UP-FEUP