mera with WebXR "+
                                "enabled. The button will become disabled again " +
                                "and the button text will explain the reason.", i);
                    viewer.set_camera(orthcam);
                    viewer.set_object(["Cameras", "default", "rotated"], orthcam)
                },
                (i) => {
                    log_message("Restoring a perspective camera. The WebXR button " +
                                "is restored to its original stat