Update app.py

app.py

@@ -378,14 +378,11 @@ with gr.Blocks(css=css) as demo:
               this.innerText = cntxt;
 
 BABYLON.Engine.LastCreatedScene.getEngine().onEndFrameObservable.add(function() {
-  alert(\"begin\");
   if (BABYLON.Engine.LastCreatedScene.activeCamera.metadata.screenshot === true) {
     BABYLON.Engine.LastCreatedScene.activeCamera.metadata.screenshot = false;
-    alert(\"do\");
     try {
-      Tools.CreateScreenshotUsingRenderTarget(BABYLON.Engine.LastCreatedScene.getEngine(), BABYLON.Engine.LastCreatedScene.activeCamera, { width: 310 }, (durl) => { document.getElementById(\"img_out\").src = durl; });
+      BABYLON.Tools.CreateScreenshotUsingRenderTarget(BABYLON.Engine.LastCreatedScene.getEngine(), BABYLON.Engine.LastCreatedScene.activeCamera, { width: 310 }, (durl) => { document.getElementById(\"img_out\").src = durl; });
     } catch(e) { alert(e); }
-    alert(\"ok\");
   }
 });
             '/>webgl2</a><br/><img src='' id='img_out'/>""")