public static SrdXrResult GetFacePose(IntPtr session,
                                              out Pose headPose, out Pose eyePoseL, out Pose eyePoseR)
        {
            var views          = new SrdXrView[3];
            var viewLocateInfo = new SrdXrViewLocateInfo();
            {
                viewLocateInfo.view_configuration_type = SrdXrViewConfigurationType.VIEW_CONFIGURATION_TYPE_PRIMARY_STEREO;
            }

            var xrResult = XRRuntimeAPI.LocateViews(session, ref viewLocateInfo, views);

            headPose = ToUnityPose(views[0].pose);
            eyePoseL = ToUnityPose(views[1].pose);
            eyePoseR = ToUnityPose(views[2].pose);
            return(xrResult);
        }
 public static extern SrdXrResult LocateViews(IntPtr session, [In] ref SrdXrViewLocateInfo view_locate_info, [Out] SrdXrView[] views);