if matrix is None:
                    # Compatibility with older note format
                    matrix = np.eye(3,3)
                else:
                    matrix = np.asarray(json.loads(matrix)["values"], dtype=np.float32).reshape(3,3)

                d = np.frombuffer(points, dtype=np.float32)
                d = d.byteswap()

                d = d.reshape(-1, 6)

                pressure = (d[:,2] / pressure_norm) ** pressure_pow
                # Projection matrix
                points = d[:, :2]
                points = np.concatenate((points, np.ones([points.shape[0],1])), axis=1)
                points = points @ matrix.T
                points = points[:, :2]