TRACER    virtual reality version  sound by Richard Cornell   
developed at Boston University Computer Graphics Lab and Scientific Visualization Facility
Tracer's references are to gesture, human communication, time and transience. It  is a luminous revolving world of drifting atmosphere and cryptic messages appearing in thin air. The piece combines active real-time participation with the discovery of ancient images from archeology, historical texts, and proto-verbal markings. Visitors to Tracer, both on location and at remote sites, connect with each other in its environment, by creating their own gestural tracery within its sphere. Sound sculpts the local atmoshere, emanating from air and objects and responding to the movements of navigators.This piece can be viewed from two venues, the ImmersaDesk and the Access Grid.

The VR environment consists of a navigable texture-mapped space (two concentric spheres, one slowly rotating) with ambient audio. Using the wand, the viewer can draw lines on a virtual canvas in the center of the space. As lines are drawn, sounds are produced whose timbre, etc. is a function of drawing speed and location. Lines drawn by remote participants (AG and VR) are seen and heard as well.

Each Access Grid participant runs a drawing application on a laptop. This application produces a stream of coordinates which are used by other networked programs to draw lines. The AG screen shows a number of rendered views from VR, one of which is navigable by AG participants. An AG-wide audio rendering engine is used to produce a composite sound stream using all drawing applications to control sound parameters. 
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DEBORAH CORNELL 
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