The 3D Tractus: a three-dimensional drawing board
Lapides et al create a tool for 3D sketching on a tablet PC. This tool is a table that the user can alter the height and transmits this height information to the PC. This allows users to sketch in 2D on the tablet and move the surface up and down for the third dimension. The table top is counter-balanced to allow it to slide up and down easily. To differentiate where a point along the vertical plane, both a thickness gradient and image hiding are used. Any ink "above" the current level of the screen is not displayed and the further the lines are below the level of the screen the thinner they become. A perspective display also gives the user cues about the depth in the drawing.
Discussion
Moving the table up and down to draw depth seems ackward. I think I'd prefer to just rotate a drawing to add depth.
Reference
Lapides, P.; Sharlin, E.; Sousa, M.C.; Streit, L. The 3D Tractus: a three-dimensional drawing board . Horizontal Interactive Human-Computer Systems, 2006. TableTop 2006. First IEEE International Workshop on Volume , Issue , 5-7 Jan. 2006
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