Update readme.md

Code complement for : ## Usage

readme.md

@@ -58,29 +58,29 @@ To add a module install the respected package. A list of extra packages and thei
 ## Usage
 See [Getting Started](http://doc.babylonjs.com/#getting-started)
 ```javascript
-// get the canvas DOM element
+// Get the canvas DOM element
 var canvas = document.getElementById('renderCanvas');
-// load the 3D engine
-var engine = new BABYLON.Engine(canvas, true);
-// createScene function that creates and return the scene
+// Load the 3D engine
+var engine = new BABYLON.Engine(canvas, true, {preserveDrawingBuffer: true, stencil: true});
+// CreateScene function that creates and return the scene
 var createScene = function(){
-    // create a basic BJS Scene object
+    // Create a basic BJS Scene object
     var scene = new BABYLON.Scene(engine);
-    // create a FreeCamera, and set its position to (x:0, y:5, z:-10)
-    var camera = new BABYLON.FreeCamera('camera1', new BABYLON.Vector3(0, 5,-10), scene);
-    // target the camera to scene origin
+    // Create a FreeCamera, and set its position to {x: 0, y: 5, z: -10}
+    var camera = new BABYLON.FreeCamera('camera1', new BABYLON.Vector3(0, 5, -10), scene);
+    // Target the camera to scene origin
     camera.setTarget(BABYLON.Vector3.Zero());
-    // attach the camera to the canvas
+    // Attach the camera to the canvas
     camera.attachControl(canvas, false);
-    // create a basic light, aiming 0,1,0 - meaning, to the sky
-    var light = new BABYLON.HemisphericLight('light1', new BABYLON.Vector3(0,1,0), scene);
-    // create a built-in "sphere" shape; its constructor takes 6 params: name, segment, diameter, scene, updatable, sideOrientation
-    var sphere = BABYLON.Mesh.CreateSphere('sphere1', 16, 2, scene);
-    // move the sphere upward 1/2 of its height
+    // Create a basic light, aiming 0, 1, 0 - meaning, to the sky
+    var light = new BABYLON.HemisphericLight('light1', new BABYLON.Vector3(0, 1, 0), scene);
+    // Create a built-in "sphere" shape; its constructor takes 6 params: name, segment, diameter, scene, updatable, sideOrientation
+    var sphere = BABYLON.Mesh.CreateSphere('sphere1', 16, 2, scene, false, BABYLON.Mesh.FRONTSIDE);
+    // Move the sphere upward 1/2 of its height
     sphere.position.y = 1;
-    // create a built-in "ground" shape; its constructor takes the same 6 params : name, width, height, subdivision, scene, updatable
-    var ground = BABYLON.Mesh.CreateGround('ground1', 6, 6, 2, scene);
-    // return the created scene
+    // Create a built-in "ground" shape; its constructor takes 6 params : name, width, height, subdivision, scene, updatable
+    var ground = BABYLON.Mesh.CreateGround('ground1', 6, 6, 2, scene, false);
+    // Return the created scene
     return scene;
 }
 // call the createScene function