public void onDrawFrame(GL10 glUnused) {
      super.onDrawFrame(glUnused);
      // -- no proper physics here, just a bad approximation to keep
      // this example as short as possible ;-)
      mRaptor.setZ(mRaptor.getZ() + 2f);
      mRaptor.setX((float) Math.sin(mTime) * 20f);
      mRaptor.setRotZ((float) Math.sin(mTime + 8f) * -30f);
      mRaptor.setRotY(180 + (mRaptor.getRotZ() * .1f));
      mRaptor.setRotY(180);
      mRaptor.setY((float) Math.cos(mTime) * 10f);
      mRaptor.setRotX((float) Math.cos(mTime + 1f) * -20f);

      mSphere.setZ(mRaptor.getZ());
      mTime += .01f;

      if (mRootCube.getZ() - mRaptor.getZ() <= (30 * -6)) {
        mRootCube.setZ(mRaptor.getZ());
      }
    }