diff --git a/src/main.js b/src/main.js
index 45714a4..c745661 100644
--- a/src/main.js
+++ b/src/main.js
@@ -21,6 +21,9 @@ async function init() {
     POTREE_POINTCLOUD_URLS,
     POTREE_SETTINGS
   )
+
+  const potreeViewer = window.potreeViewer
+  window.viewer = window.potreeViewer
   potreeViewer.addEventListener('camera_changed', updateText)
   setupRightClickListener(potreeViewer)