Virtual Life Network: a Body-Centered Networked Virtual Environment

In order to feel the sense of presence in the Virtual Environment, it is important for the participants to become a part of this environment and interact with it through natural behaviors. This is even more emphasized in Networked Collaborative Virtual Environments where the participants need to see and interact with each other. We present the Virtual Life Network (VLNET), a joint research effort in the field of Networked Collaborative Virtual Environments at MIRALab University of Geneva and Computer Graphics Laboratory of the Swiss Federal Institute of Technology Lausanne. In VLNET each participant is represented by a virtual human actor with realistic appearance and movements similar to the actual body. Interacting with the environment through his virtual body, the participant is perceived by himself and others in a natural way. Since it is generally not possible to track all degrees of freedom of the human body in order to reproduce the realistic body motion, we introduce the motor functions that generate natural motion for standard tasks such as walking and arm motion; they are based on limited tracked information (hand and head positions). Using the same virtual human representation, but with the addition of high-level control, autonomous virtual actors can be introduced into the environment to perform some useful tasks or simply to make the environment more appealing. To further enhance the realistic feel of the virtual environment and to simplify object manipulation we provide the facility of defining object behaviors by attaching motor functions to the objects.