It uses the gyroscope for changing the users direction in the 3D world and the accelerometer to apply a force to the rigid body.
It uses Bullet and OpenGL ES 1.1.

iPad:
https://itunes.apple.com/us/app/asteroi ... ?ls=1&mt=8
iPhone:
https://itunes.apple.com/us/app/asteroi ... ?ls=1&mt=8
Thanks for this great and useful Physics Engine!!