POC: OpenGLES with Orientation Sensor

This is a proof-of-concept (P.O.C.) for rendering OpenGL world by using the phone's Orientation Sensor as an input.

First I'll draw a crate in 3D space, then I'll set the camera (View Point) to look at it. whenever a user look away (roll/pitch/yaw) the crate, it will disappear from screen until the user point the phone back to that direction.

here's an illustration of what I mean:

code segments:


public class GLSurfaceViewActivity extends Activity implements SensorEventListener{

@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 // ...
 // --- init sensor ---
 mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
 sensorList = mSensorManager.getSensorList(Sensor.TYPE_ORIENTATION);
 orientationSensor = sensorList.get(0);
 // ...
 mSensorManager.registerListener(this,
 orientationSensor,SensorManager.SENSOR_DELAY_FASTEST);
 }

 /**
   *
   **/
 public void onSensorChanged(SensorEvent event){
  if (event.sensor == orientationSensor) {
              orientationValues = event.values;
              // values[0]:
              // Azimuth, angle between the magnetic north direction and the Y axis,
              // around the Z axis (0 to 359). 0=North, 90=East, 180=South, 270=West
              float rz = event.values [0];
              // values[1]:
              // Pitch, rotation around X axis (-180 to 180),
              // with positive values when the z-axis moves toward the y-axis.
              float rx = event.values [1];            
              // values[2]:
              // Roll, rotation around Y axis (-90 to 90),
              // with positive values when the x-axis moves away from the z-axis. 
              float ry = -event.values [2];
   // pass these sensor values into renderer ...
  }
 }
}

public class CrateRenderer implements GLSurfaceView.Renderer {
// ...

public void onDrawFrame(GL10 gl) {
  // rotate the camera around object
         gl.glRotatef(rx, 1, 0, 0);
         gl.glRotatef(ry, 0, 1, 0);
         gl.glRotatef(rz, 0, 0, 1);
  // ...
 mCube.draw(gl, textureFilter);
}
// ...
}