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- Loompianola CDPublication . Perrotta, André
- A survey of real locomotion techniques for immersive virtual reality applications on head-mounted displaysPublication . Cardoso, Jorge C. S.; Perrotta, AndréLocomotion is a fundamental activity in Virtual Reality (VR) and has been the focus of a large body of research since the implementation of the first systems. In real locomotion techniques, users physically move in the real world to affect movement in the Virtual Environment (VE). Real locomotion has been found to perform better than other forms of locomotion for many tasks. To overcome the challenges imposed by restricted physical space, researchers have devised ingenious interaction techniques for real locomotion. In this paper, we present a survey of interaction techniques for real locomotion in VR. Our analysis is focused on the interaction techniques – the combination of devices, user’s actions, and system’s responses. We categorize interaction techniques for real locomotion in VR into: unmediated, warnings, reorientation/resetting, scaling, redirection, and dynamic VE. These categories represent fundamentally different approaches to real locomotion and user action feedback. We further characterize techniques in each of these categories according to category-specific parameters. Finally, it is important to state that this paper was developed with the aim of helping newcomers to the field to understand and implement the techniques here presented.
- Rainforest: an interactive ecosystemPublication . Beyls, Peter; Perrotta, AndréThis paper describes a self-regulating artificial ecosystem in continuous exposure to human observers. Particles of variable morphology engage in local interaction and give rise to emergent overall audiovisual complexity. People only exercise influence over autonomous behavior developing in the artificial world. A machine-learning algorithm basically aims to maximize audiovisual diversity by tracking changes in systems behavior in relation to behavior in the artificial world. We suggest rewarding human-machine interaction to exist in the elaboration of dynamic relationships between spatial and cognitive human behavior and audiovisual performance in an artificial universe.
- Modelling the live-electronics in electroacoustic music using particle systemsPublication . Perrotta, André V.; Menezes, Flo; Martins, Luis GustavoDeveloping the live-electronics for a contemporary electroacoustic piece is a complex process that normally involves the transfer of artistic and aesthetic concepts between the composer and the musical assistant. Translating in technical terms the musical, artistic and aesthetic concepts by means of algorithms and mathematical parameters is seldom an easy and straightforward task. The use of a particle system to describe the dynamics and characteristics of compositional parameters can reveal an effective way for achieving a significant relationship between compositional aspects and their technical implementation. This paper describes a method for creating and modelling a particle system based on compositional parameters and how to map those parameters into digital audio processes. An implementation of this method is described, as well as the use of such a method for the development of the work O Farfalhar das Folhas (The rustling of leaves) (2010), for one flutist, one clarinetist, violin, violoncello, piano and live-electronics, by Flo Menezes.