the following 3 post are about projecting an interactive 
visualization onto a milled elevation-model.
currently we are working on integrating GLGraphics, a 
kinect-tracking system, and some physics libraries.(--> projection [3])



projection [3] (2011 - WIP): http://thomasdiewald.com/blog/?p=970




projection [2] (2010): http://thomasdiewald.com/blog/?p=878





projection [1] (2010): http://thomasdiewald.com/blog/?p=452