public void render () {
		input();

		Gdx.gl.glClearColor(1, 0, 0, 1);
		Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

		cam.update();

		renderer.setView(cam); // tile map renderer
		renderer.render();

		// TODO
		// offset drawing test
		Matrix4 mat = new Matrix4();
		mat.translate(512,512,0);

		batch.begin();
		batch.setProjectionMatrix(cam.combined);
		batch.setTransformMatrix(mat);
			player.render( batch );
		batch.end();
	}