Build your First Web VR Game for the Absolute Beginner

This is source and tutorial for building your first website and first web vr game - all in one!

Create index.html and index.js files

Open VS code and create a new file called index.html
Copy and paste this html and css into the file.

<html>

    <head>
        <!--The HTML <style> tag is used for declaring style sheets within your HTML document. 
            Each HTML document can contain multiple <style> tags.-->
        <style>
            html,
            body {
                overflow: hidden;
                width: 100%;
                height: 100%;
                margin: 0;
                padding: 0;
                text-align: center;
            }

            #renderCanvas {
                width: 100%;
                height: 100%;
                touch-action: none;
            }
        </style>
        
        <!-- Import Babylon.js framwork-->
        <script src="https://preview.babylonjs.com/babylon.js"></script>
    </head>

    <body>
        <!--The canvas element is part of HTML5 and allows for dynamic, 
            scriptable rendering of 2D shapes and bitmap images. It is a low level, 
            procedural model that updates a bitmap and does not have a built-in scene graph; 
            however through WebGL allows 3D shapes and images and so-on.-->
        <canvas id="renderCanvas"></canvas>
        <!--The <script> tag is used to define a client-side script (JavaScript). 
            The <script> element either contains scripting statements, or it points to an 
            external script file through the src attribute.-->
        <script src="index.js"></script>
    </body>

</html>

Now create the index.js file and copy and paste this code into it.

var canvas = document.getElementById("renderCanvas");
var engine = new BABYLON.Engine(canvas, true);

var createScene = function () {

	// This creates a basic Babylon Scene object (non-mesh)
	var scene = new BABYLON.Scene(engine);
	
	// Create camera and lighting
	var camera = new BABYLON.FreeCamera("camera1", new BABYLON.Vector3(0, 2, -25), scene);
	camera.setTarget(BABYLON.Vector3.Zero());
	var light = new BABYLON.DirectionalLight("light", new BABYLON.Vector3(0, -0.5, 1.0), scene);
	light.position = new BABYLON.Vector3(0, 15, -6);
	
	// Create default environment
	var environment = scene.createDefaultEnvironment({
		skyboxSize: 300,
		groundSize: 200
	});
	environment.setMainColor(new BABYLON.Color3(0.1, 0.3, 0.5));
	
	//Create a sphere for the scene
	var sphere = BABYLON.Mesh.CreateIcoSphere("sphere", {radius:0.8, flat:true, subdivisions: 16}, scene);
	sphere.material = new BABYLON.StandardMaterial("material", scene);
	sphere.material.diffuseColor = new BABYLON.Color3(0.588, 0.805, 0.896);
	
	// Add vr
	var helper = scene.createDefaultVRExperience({createDeviceOrientationCamera: false})
	helper.enableInteractions()
	
    return scene;
};

var scene = createScene();

engine.runRenderLoop(() => {
scene.render();
});

Save file and navigate to the file explorer. Double click the index.html

In this tutorial we switch over from VS Code to the browser based Babylon playground, located at: playground.babylonjs.com. However if you want to stay in VS Code I recommend following the dev.to Blog post
Additionally in the Helpful Links I provide links to the github repo for the typescript starter projet and the completed game.

Ok, to get started, let's recreate what we just did in vscode, here in the playground.

Select all of the code that you see in left window, and delete it!
Now let's copy in the following code into that same window.

var createScene = function () {

	// This creates a basic Babylon Scene object (non-mesh)
	var scene = new BABYLON.Scene(engine);
	
	// Create camera and lighting
	var camera = new BABYLON.FreeCamera("camera1", new BABYLON.Vector3(0, 2, -25), scene);
	camera.setTarget(BABYLON.Vector3.Zero());
	var light = new BABYLON.DirectionalLight("light", new BABYLON.Vector3(0, -0.5, 1.0), scene);
	light.position = new BABYLON.Vector3(0, 15, -6);
	
	// Create default environment
	var environment = scene.createDefaultEnvironment({
		skyboxSize: 300,
		groundSize: 200
	});
	environment.setMainColor(new BABYLON.Color3(0.1, 0.3, 0.5));
	
	//Create a sphere for the scene
	var sphere = BABYLON.Mesh.CreateIcoSphere("sphere", {radius:0.8, flat:true, subdivisions: 16}, scene);
	sphere.material = new BABYLON.StandardMaterial("material", scene);
	sphere.material.diffuseColor = new BABYLON.Color3(0.588, 0.805, 0.896);
	
	// Add vr
	var helper = scene.createDefaultVRExperience({createDeviceOrientationCamera: false})
	helper.enableInteractions()
	
    return scene;
};

Sweet, let's move the sphere up a bit so that it doesn't intersect the ground.

We can directly control the position of any object in Babylon by adding or subtracting values to the x, y, or z coordnates. Let's copy the following code snippet underneath the rest of our sphere code.

    sphere.position.y = 2;

Once you've added that line, click the Run button to see the change you just made reflected instantly in the right window.

Nice Work!!!

Let's make this scene a little more interesting by adding physics to the sphere!

We need to start by first telling the scene that we want to enable physics. We can do that by copying the following code into our scene. To keep things tidy, let's copy this in towards the top, directly under where we create the basic Babylon Scene Object

    // enable physics in the scene
    scene.enablePhysics(new BABYLON.Vector3(0,-1,0), new BABYLON.AmmoJSPlugin());

Now we need to tell Babylon that the sphere is a physics object and should be controlled by the physics engine that we just enabled. We can do that by copying the following code snippet underneath the rest of our 'sphere' code.

    sphere.physicsImpostor = new BABYLON.PhysicsImpostor(sphere, BABYLON.PhysicsImpostor.SphereImpostor, { mass: 1, restitution: 0.7 }, scene);

Ok let's try hitting run again and seeing what happens. Woohoo! Pretty easy to apply physics to Babylon objects huh?

Next up: we want the sphere to disappear when we click on it right? Let's make that happen

First let's create an event that fires whenever a click happens. Copy this snippet underneath all of our sphere code.

    //add an event that fires when a click happens
    scene.onPointerObservable.add((e)=>{
        if(e.type == BABYLON.PointerEventTypes.POINTERDOWN){
            if(e.pickInfo.pickedMesh == sphere){
                fadeSphere(sphere);
            }
        }
    });

What's happening here, is that any time a click occurs, we check to see if a mesh was under the cursor. If there was a mesh, we check to see if it was our sphere, and if so, we call a function and pass in our sphere object.

As you can probably guess, now we need to create that new function called 'fadeSphere.' Let's copy the next snippet just below our newly added click event handler.

//add a function that scales and fades the sphere
function fadeSphere(clickedSphere){
    BABYLON.Animation.CreateAndStartAnimation("sphereScaleDown", clickedSphere, "scaling.x", 30, 10, 1, 0.5, 0);
    BABYLON.Animation.CreateAndStartAnimation("sphereScaleDown", clickedSphere, "scaling.y", 30, 10, 1, 0.5, 0);
    BABYLON.Animation.CreateAndStartAnimation("sphereScaleDown", clickedSphere, "scaling.z", 30, 10, 1, 0.5, 0);
    BABYLON.Animation.CreateAndStartAnimation("sphereVisAnim", clickedSphere, "visibility", 30, 10, 1, 0, 0);
};

Once you've copied that over, let's try running the scene again and this time, try clicking on the sphere.

Pretty cool right? If you look through the code inside the 'fadeSphere' function, what you'll see how easy it is to animate the properties of objects inside of Babylon. The 5 numeric values that are passed into each animation are

frames per second
the number of frames it should take to go from the starting value, to the ending value
starting value
ending value
loop mode (boolean)

Let's add a button into the scene that resets the game when it's clicked

Let's copy the following snippet underneath our sphere code.

    // Create a button to restart the game
    var plane = BABYLON.Mesh.CreatePlane("plane", 40);
    plane.position.set(0, 2, 10);
    var advancedTexture = BABYLON.GUI.AdvancedDynamicTexture.CreateForMesh(plane);
    var button = BABYLON.GUI.Button.CreateSimpleButton("button", "Start Game");
    button.width = 0.25;
    button.height = "40px";
    button.color = "white";
    button.background = "black";
    button.onPointerUpObservable.add(function () {
        resetGame();
    });
    advancedTexture.addControl(button);

Lots to dissect here, but at the highest level, what we're doing is creating a button with a label on it that says 'Start Game.' When that button is pressed we call a function called 'resetGame.'

Now we're going to need that function. Copy this snippet underneath our fadeSphere function.

function resetGame(){
    button.textBlock.text = "Reset Game";
    sphere.visibility = 1;
    sphere.scaling.x = 1;
    sphere.scaling.y = 1;
    sphere.scaling.z = 1;
    sphere.position.y = 2;
    sphere.physicsImpostor.setLinearVelocity(new BABYLON.Vector3());
};

When the button is pressed and the 'resetGame' function is called, we put the scale, position, and visibility of the sphere back to where we started.

Click run to see our latest progress in action.

Next thing we should add is the ability to keep score in our game.

We're going to start by creating a variable to hold our score count. Copy the following snippet underneath our camera and lighting code near the top.

    // Creat a variable to hold our score.
    var score = 0;

Ok let's make sure our score is updated whenever our sphere is clicked. Copy the following snippet and paste it into the 'fadeSphere' function as the first line in the function.

    score++;
    button.textBlock.text = "Reset Game (Score: "+score+")";

Next let's make sure we reset the score when the reset button is pressed. Copy and paste this snippet as the first thing that happens inside of the resetGame function.

    score = 0;

Ok let's run this! Not bad! We've got the makings of a game here. Although...it's a pretty boring game.

Let's make this game a little more interesting by adding in more spheres!

To start with, we're going to replace all of our current sphere creation code. Find this code:

    //Create a sphere for the scene
    var sphere = BABYLON.Mesh.CreateIcoSphere("sphere", {radius:0.8, flat:true, subdivisions: 16}, scene);
    sphere.material = new BABYLON.StandardMaterial("material", scene);
    sphere.material.diffuseColor = new BABYLON.Color3(0.588, 0.805, 0.896);
    sphere.position.y = 2;
    sphere.physicsImpostor = new BABYLON.PhysicsImpostor(sphere, BABYLON.PhysicsImpostor.SphereImpostor, { mass: 1, restitution: 0.7 }, scene);

and replace it with this:

    // Create spheres
    var numberOfSpheres = 10;
    var spheres = [];
    for (let index = 0; index < numberOfSpheres; index++) {
        spheres[index] = BABYLON.Mesh.CreateIcoSphere("sphere", {radius:0.8, flat:true, subdivisions: 16}, this.scene);
        spheres[index].material = new BABYLON.StandardMaterial("material", scene)
        spheres[index].material.diffuseColor = new BABYLON.Color3(0.588, 0.805, 0.896)
        spheres[index].physicsImpostor = new BABYLON.PhysicsImpostor(spheres[index], BABYLON.PhysicsImpostor.SphereImpostor, { mass: 1, restitution: 0.7 }, scene);
        spheres[index].position = new BABYLON.Vector3(Math.random() * 20 - 10, 10, Math.random() * 10 - 5);
    }

This new code shows you how loops work. We loop through a series of code that creates a sphere, adds and modifies a material to that sphere, adds physics to that sphere, and gives it a random starting ___location. It does this for the number of times specified by the numberOfSpheres variable.

Next up is to replace the following code in the 'resetGame' function:

    sphere.visibility = 1;
    sphere.scaling.x = 1;
    sphere.scaling.y = 1;
    sphere.scaling.z = 1;
    sphere.position.y = 2;
    sphere.physicsImpostor.setLinearVelocity(new BABYLON.Vector3());

with this:

    for (let index = 0; index < numberOfSpheres; index++) {
        spheres[index].visibility = 1;
        spheres[index].scaling.x = 1;
        spheres[index].scaling.y = 1;
        spheres[index].scaling.z = 1;
        spheres[index].position = new BABYLON.Vector3(Math.random() * 20 - 10, 10, Math.random() * 10 - 5);
        spheres[index].physicsImpostor.setLinearVelocity(new BABYLON.Vector3());
    }

This basically does the same things we did to reset our first sphere, but does it for all of the spheres.

Ok last thing we have to update to get multiple spheres working in our game is to replace the following code:

    //add an event that fires when a click happens
    scene.onPointerObservable.add((e)=>{
        if(e.type == BABYLON.PointerEventTypes.POINTERDOWN){
            if(e.pickInfo.pickedMesh == sphere){
                fadeSphere(sphere);
            }
        }
    });

with this:

    // When a sphere is clicked update the score
    scene.onPointerObservable.add((e)=>{
        if(e.type == BABYLON.PointerEventTypes.POINTERDOWN){
            spheres.forEach((s)=>{
                if(e.pickInfo.pickedMesh == s){
                    fadeSphere(s);
                }
            });
        }
    });

Again, we're simply updating the code here to check and see if any of the spheres were underneath the cursor when a click occured.

Ok let's run this! We've got a solid little game going here don't we?!!

Fix that Bug!

There's one last thing that we need to tackle before we wrap up. There's a bug in our game! You can hit a sphere multiple times before it disappears, inflating your score. That's not what we want...we want each sphere to be able to be hit just once.

Fixing this bug is pretty easy. Once a sphere is clicked, we want to make sure it's no longer clickable. So we'll start with the 'fadeSphere' function, which contains all of our code for what happens once a sphere is clicked. Find that 'fadeSphere' function and add the following snippet:

	clickedSphere.isPickable = false;

Then we need to make sure that once we reset the game, that all of the spheres are made clickable again. We can do that by adding the following code to our resetGame function, inside of the for loop let's add this:

	spheres[index].isPickable = true;

Run it and try it out! Sweet!! Nice job! Hit save in the playground to save your work.

Congratulations!

You made a VR game entirely on the web! And it wasn't that tricky either was it? Be sure to keep playing and trying new things. Here's a fantstic resource where you can dive in deeper into learning more about Babylon.js

doc.babylonjs.com

One last fun thing to show you. If you've saved your scene, you can go to settings in the playground and look for QR Code Link. Grab your phone and get your camera out to scan this code...now you can take your VR game with you!

Helpful Links

Dev.to tutorial to Build the entire game in VS Code with TypeScript
Github Repo for TypeScript BabylonJS Starter project to build your own game
Github Repo for completed Game in VS Code with TypeScript

How to host a static site on Microsoft Azure Cloud

Go to https://portal.azure.com
Click Create a resource
Click Storage account
Select Create new Resource Group
Give your storage account a name. Something like myawesomegame
Select a Location (this is the ___location of the data center that has all the servers ready for us to use)
Leave the defaults for all the other fields the click Review + create
Click Create. It will take a minute to deploy and create your resource
Go to the resource when you get the confirmation that it has been created
Click Static website from the left hand navigation then click Enabled
Index document name is index.html then click Save
Select the $Web link that appears after your save. This will bring us to the blob storage we want to upload our files to.
Click Upload
Click the Folder Icon to navigate to your index.html and index.js files that we created in this tutorial
Select both the index.html and index.js files and click open
Click Upload
Exit out of the upload pane by clicking the X in the upper right corner.
Select Change access level from the top nav
Select Container (anonymous read access for containers and blobs)
Select OK
Use the bread crumbs nav at the very top to navigate back to the static website pane.
Copy the Primary endpoint url and paste it into the browser. (Make sure the Index Document name is set to index.html)
TADA! Your game is hosted! Thanks Azure! :D

Name		Name	Last commit message	Last commit date
Latest commit History 66 Commits
README.md		README.md
index.html		index.html
index.js		index.js

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Build your First Web VR Game for the Absolute Beginner

Create index.html and index.js files

Ok, to get started, let's recreate what we just did in vscode, here in the playground.

Sweet, let's move the sphere up a bit so that it doesn't intersect the ground.

Let's make this scene a little more interesting by adding physics to the sphere!

Next up: we want the sphere to disappear when we click on it right? Let's make that happen

Let's add a button into the scene that resets the game when it's clicked

Next thing we should add is the ability to keep score in our game.

Let's make this game a little more interesting by adding in more spheres!

Fix that Bug!

Congratulations!

Helpful Links

How to host a static site on Microsoft Azure Cloud

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Build your First Web VR Game for the Absolute Beginner

Create index.html and index.js files

Ok, to get started, let's recreate what we just did in vscode, here in the playground.

Sweet, let's move the sphere up a bit so that it doesn't intersect the ground.

Let's make this scene a little more interesting by adding physics to the sphere!

Next up: we want the sphere to disappear when we click on it right? Let's make that happen

Let's add a button into the scene that resets the game when it's clicked

Next thing we should add is the ability to keep score in our game.

Let's make this game a little more interesting by adding in more spheres!

Fix that Bug!

Congratulations!

Helpful Links

How to host a static site on Microsoft Azure Cloud

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