In this paper we present the design and development of a horizontal interface called TABO (TAbletop at uniBO). TABO is a low cost, passive stereo, rear projected visualization device conceived to support the analysis of complex simulated environments. The horizontal lay-out of the projection screen is suitable for the visualization of synthetic environments in that fields in which the top is considered as a natural point of view (God’s eye view). On the other side, the projection area size provides a multi-user co-located visualization. One of the projects developed by means of TABO is based on the visualization of ATC (Air Traffic Control) scenarios. The photorealistic virtual environment is populated with airplanes animated by different data sources such as FDR (Flight Data Recorders) and flight simulators connected in real time. ATC is a collaborative process in which the top is a natural point of view (radar displays, maps etc.). In this case, the use of stereoscopy enhances the perception of depth, giving to the user more awareness about the vertical separation of airplanes.
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