const Vector3 &get_position() const { return position; }
const Vector3 &get_look_direction() const { return look_dir; }
const Vector3 &get_up_direction() const { return up_dir; }
const Vector3 &get_position() const { return position; }
const Vector3 &get_look_direction() const { return look_dir; }
const Vector3 &get_up_direction() const { return up_dir; }