which does not show the locations of the different participants very effectively.

A more elaborate body image capture method would be to use range-imaging techniques to capture a three-dimensional model of the body and face. Such automatic three-dimensional model acquisition is needed by other branches of the SE field, and various prototype systems exist for range imaging. A three-dimensional image of the body of each participant in a virtual meeting begins to make such meetings sound like they could actually come close to duplicating the perceptual feel of being physically present at a real meeting.

These technologies, though still immature, offer the possibility of electronically projecting oneself, as easily as one currently makes telephone calls, into virtual worlds inhabited by other distant human users, with whom one can have face-to-face interactions both one-on-one and in groups. These shared multiperson virtual worlds create a shared space, in which each human participant has a position, a body image resembling his or her own real appearance, and a viewpoint from which to observe the behaviors and facial expressions of the other people engaged in the transaction.



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