Update app.py

app.py

@@ -643,7 +643,7 @@ async(p, d, n)=>{
             let mesh = BABYLON.Engine.LastCreatedScene.getMeshByName("dome_mesh")._children[i];                
             mesh.dispose(false, true);
           }
-          BABYLON.Engine.LastCreatedScene.getMeshByName("dome_mesh").applyDisplacementMap(d.background.url, 0, 255, function(m){try{BABYLON.Engine.LastCreatedScene.addMesh(m,false);alert(JSON.stringify(m));}catch(e){alert(e);}}, null, null, true, function(e){alert(e);});
+          BABYLON.Engine.LastCreatedScene.getMeshByName("dome_mesh").applyDisplacementMap(d.background.url, 0, 255, function(m){try{alert(BABYLON.Engine.Version);BABYLON.Engine.LastCreatedScene.addMesh(m,false);BABYLON.Engine.LastCreatedScene.getMeshByName("dome_mesh").dispose();}catch(e){alert(e);}}, null, null, true, function(e){alert(e);});
         });
         if (!BABYLON.Engine.LastCreatedScene.activeCamera.metadata) {
           BABYLON.Engine.LastCreatedScene.activeCamera.metadata = {