Apple has its sights set on three-dimensional gestures if a recent patent filing detailed by AppleInsider is any indication. The write up describes 3D additions to the commonly used swipe and pinch, including push, pull, twist and sculpt. Ultimately to work, a future iPad would require additional sensors to detect the proximity of user input to the display.
Lifting one's fingers off the screen would result in iOS or a compatible third-party app generating or manipulating a 3D object. Shapes or clay objects could be rendered on the display in real time, taking advantage of the iPad Retina display. Titled "Working with 3D Objects," the patent points to several potential uses that could make iOS devices more useful for a variety of applications.