def _make_fullscreen_cam(self):
        """ Creates an orthographic camera for the buffer """
        buffer_cam = Camera("BufferCamera")
        lens = OrthographicLens()
        lens.set_film_size(2, 2)
        lens.set_film_offset(0, 0)
        lens.set_near_far(-100, 100)
        buffer_cam.set_lens(lens)
        buffer_cam.set_cull_bounds(OmniBoundingVolume())
        self._camera = self._node.attach_new_node(buffer_cam)
        self._region.set_camera(self._camera)
 Creates an orthographic camera for the buffer 
metadrive/render_pipeline/rpcore/util/post_process_region.py