AugmentedEntiy, an augmented reality application for Android

This time, I'm making an augmented reality application for Android. Augmented reality is about mixing live image from a capture device and adding some computer generated data on top of it.

Example:
http://www.youtube.com/watch?v=m6tdhDYN_fE

I'm not satisfied with the fact that a marker is needed to place elements on the scene. My attempt will be to let user define augmented objects placement on the scene.

Android view for augmented reality

The right Android setup for augmented reality is made of "camera preview" view that will sit on top of an OpenGL view with translucent background.

Camera motion

In augmented reality, the phone motion has to match the camera motion of then rendered 3D scene.
Folllowing this tutorial gives the right effect :
http://techoutbreak.com/2011/android-ar-tutorial-part-1-device-orientation/