public void onDrawFrame(GL10 glUnused) {
   super.onDrawFrame(glUnused);
   mMaterial.setTime((System.currentTimeMillis() - mStartTime) / 1000f);
   mMaterialPlugin.setCameraPosition(getCurrentCamera().getPosition());
 }
 @Override
 public void onSurfaceCreated(GL10 gl, EGLConfig config) {
   super.onSurfaceCreated(gl, config);
   mStartTime = System.currentTimeMillis();
 }