Update app.py

app.py

@@ -593,10 +593,14 @@ async(p, d, n)=>{
       if (BABYLON && BABYLON.Engine.LastCreatedScene) {
         BABYLON.Engine.LastCreatedScene.onAfterRenderObservable.add(function() { //onDataLoadedObservable
           var bg = JSON.parse(document.getElementById("bgcolor").getElementsByTagName("textarea")[0].value);
+          BABYLON.Engine.LastCreatedScene.getEngine().setHardwareScalingLevel(1.0);
           for (var i=0; i<bg.length; i++) {
             bg[i] /= 255;
           }
           BABYLON.Engine.LastCreatedScene.clearColor = new BABYLON.Color4(bg[0], bg[1], bg[2], bg[3]);
+          BABYLON.Engine.LastCreatedScene.autoClear = false;
+          BABYLON.Engine.LastCreatedScene.autoClearDepthAndStencil = false;
+          BABYLON.Engine.LastCreatedScene.getAnimationRatio();
           for (var i=0; i<BABYLON.Engine.LastCreatedScene.getNodes().length; i++) {
             if (BABYLON.Engine.LastCreatedScene.getNodes()[i].material) {
               BABYLON.Engine.LastCreatedScene.getNodes()[i].material.pointSize = Math.ceil(Math.log2(Math.PI/document.getElementById("zoom").value));