Surface drawing is a 3D modeling technique where you use your hand motions to create shapes.
As you move your hand through space, the trail of its motion is recorded by the computer as a stroke. These strokes appear to float in the air, thanks to the head-tracked stereoscopic display environment of the responsive workbench.
Finally we\’re seeing real-life implementations of the virtual reality stuff we were promised 10 years ago.
[ From Signal vs. Noise ]