Construction, manipulation et visualisation de processus sonores dans des environnements virtuels immersifs pour la performance musicale

The work presented in this thesis belongs to the computer music field as well as to the virtual reality field. First, we describe the advantages of immersive virtual environments and of 3D graphical interaction for multiprocess instruments and particularly for the hierarchical live-looping, a new instrument model that we define. We then suggest solutions to visualize and manipulate sound processes in these virtual environments. In order to display the sound processes, we introduce the 3D reactive widgets, which rely on audiovisual mappings that we study. We develop a novel 3D interaction device suitable for musical interaction, called Piivert, together with associated interaction techniques, among which the tunnels, in order to manipulate the 3D reactive widgets Finally, we implement the hierarchical live-looping with an immersive instrument called Drile, using the previously developped techniques, and we study different stages for immersive musical performances.