//earth.rigidBody().addForce(moonGravity);
//moon.rigidBody().addForce(earthGravity);
background = rect2D(new Material(loadTexture(new File("textures/background.png"))), 4, 3, 800, 600);
viewpoint = new ScreenViewpoint(Vector2.zero(), 1 / 32768f, 0) {
@Override
public Vector2 cameraPosition() {
return ship.pos.xy();
}
};