Update app.py

app.py

@@ -640,7 +640,7 @@ async(c, o, p, d, n, m)=>{
           BABYLON.Engine.LastCreatedScene.meshes[BABYLON.Engine.LastCreatedScene.meshes.length-1].applyDisplacementMap(m[o_[j]].url, 0, 255, function(m){try{alert(BABYLON.Engine.Version);}catch(e){alert(e);}}, null, null, true, function(e){alert(e);});
         }
         loadEditControl();
-        const editControl = new EditControl(BABYLON.Engine.LastCreatedScene.meshes[parseInt(document.getElementById("cnum").value)], BABYLON.Engine.LastCreatedScene.activeCamera, document.getElementById("model3D").getElementsByTagName("canvas")[0], 1.0, true, 0.02);
+        const editControl = new EditControl(BABYLON.Engine.LastCreatedScene.meshes[BABYLON.Engine.LastCreatedScene.meshes.length-1-parseInt(document.getElementById("cnum").value)], BABYLON.Engine.LastCreatedScene.activeCamera, document.getElementById("model3D").getElementsByTagName("canvas")[0], 1.0, true, 0.02);
         editControl.enableTranslation();
         
         if (document.getElementById("model")) {