e.", i);
                    viewer.create_camera();
                },
                (i) => {
                    log_message("Test done!", i);
                    // We're done; remove the button.
                    var button = document.getElementById("step-button");
                    button.parentNode.removeChild(button);
                }
            ];

            var run_step = () => {
                if (step_counter < actions.length) {
                    actions[step_counter](step_counter + 