http://www.pcmag.com/article2/0,2817,2400126,00.asp
Current 3D simulation for gaming and other applications on handheld devices uses data from various instruments like accelerometers and gyrometers that are built into the devices to recreate "six-axis" positional information, the blog notes, while facial-recognition software has also been improved upon greatly in recent years for biometrics and other purposes.