[2023 ver.] Getting Started with WebXR using Babylon.js

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February 11, 23

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可視化技術や人間計測/空間計測技術を活用した問題解決に関する研究開発。 ARコンテンツ作成勉強会(tryAR)を主催。

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1.

Getting Started with WebXR using Babylon.js for HoloLens 2 / Meta Quest

2.

Download sample files https://github.com/TakashiYoshinaga/AR-Fukuoka/ raw/main/Babylonjs_20230211/Sample.zip

3.

Todayʼs Goal https://youtu.be/iok646xGtd0 Introduction to the basic usage of Babylon.js and the use of MRTK for interaction

4.

Duplicate Template Source Code https://glitch.com/~babylon-template GET STARTED

5.

Duplicate Template Source Code Remix Your Own

6.

Duplicate Template Source Code Click on index.html and confirm that the code is displayed index.html

7.

Duplicate Template Source Code Click on index.html and confirm that the code is displayed Editor Preview

8.

Tip: If Preview is Not Displayed PREVIEW

9.

Tip: If Preview is Not Displayed Open preview pane

10.

Exercise Procedure Web browser on PC Creation of 3D space HoloLens/Quest XR Mode Interaction by MRTK Visualize Hands

11.

Check the Template

12.

Check the Template Loading Library Description of drawing and interaction (today's main focus) Layout of drawing area

13.

Check the Template Layout of drawing area

14.
[beta]
Explanation of HTML Description
<!-- Area to be drawn -->
<canvas id="renderCanvas" style="width: 100%; height: 100%;"></canvas>

ID is used when accessing from javascript

Paste the canvas in the window at the full size.

15.

Check the Template Loading Library

16.

テンプレートの確認 Description of drawing and interaction (today's main focus)

17.

Exercise Procedure Web browser on PC Creation of 3D space HoloLens/Quest XR Mode Interaction by MRTK Visualize Hands

18.

Declaration of Variables Add variable here //Initialization of variables after page loading is completed window.onload = function() { } //Initialization of 3D scene function createScene() { } //Initialization of WebXR settings async function initializeXR(){ } //Initialization of 3D objects to be drawn function addObjects(){ }

19.

Declaration of Variables let canvas; //canvas element (drawing area) ← "where" to draw let engine; //Drawing functionality with Babylon.js ← "What" to draw with let scene; //Virtual 3D space ← "What" to draw //Initialization of variables after page loading is completed window.onload = function() { } //Initialization of 3D scene function createScene() { } //Initialization of WebXR settings async function initializeXR(){ } Lesson02

20.
[beta]
Initialization of Drawing Functions of Babylon.js
let canvas; //canvas element (drawing area) ← "where" to draw
let engine; //Drawing functionality with Babylon.js ← "What" to draw with
let scene; //Virtual 3D space ← "What" to draw
//Initialization of variables after page loading is completed
window.onload = function() {
//Obtain the drawing area (canvas element) from HTML
canvas = document.getElementById("renderCanvas");
//Preparation for drawing with Babylon.js (Arguments: destination, anti-aliasing)
engine = new BABYLON.Engine(canvas, true);
//カメラやライトの設定を⾏ったscene(3D空間)を取得
scene= createScene();
}
//Initialization of 3D scene
function createScene() {
}

Lesson03

21.
[beta]
Initialization of Scene (3D Space)
let canvas; //canvas element (drawing area) ← "where" to draw
let engine; //Drawing functionality with Babylon.js ← "What" to draw with
let scene; //Virtual 3D space ← "What" to draw
//Initialization of variables after page loading is completed
window.onload = function() {
//Obtain the drawing area (canvas element) from HTML
canvas = document.getElementById("renderCanvas");
//Preparation for drawing with Babylon.js (Arguments: destination, anti-aliasing)
engine = new BABYLON.Engine(canvas, true);
//Create a scene (3D space) with camera and light settings
createScene();
}
// Initialization of 3D scene
function createScene() {
}

Description of the initialization process of a scene (next page)

Lesson04

22.
[beta]
Initialization of Scene (3D Space)
function createScene() {
//Create 3D space
scene = new BABYLON.Scene(engine);
//Set background color
scene.clearColor = new BABYLON.Color3.Black();
//Set Light (arguments: name, direction of reflection, destination)
let light = new BABYLON.HemisphericLight("light",
new BABYLON.Vector3(1, 1, -0.5) ,scene);
//Create a camera[Details]
let camera = new BABYLON.ArcRotateCamera(
"camera",
//name of camea
-Math.PI/2, Math.PI/2, 3, //alpha,beta,distance form origin
new BABYLON.Vector3(0, 0, 0)); //look at
// Enables camera operation with mouse or keyboard
camera.attachControl(canvas, true);
}

Lesson05

23.
[beta]
Start Drawing
//Initialization of variables after page loading is completed
window.onload = function() {
//Obtain the drawing area (canvas element) from HTML
canvas = document.getElementById("renderCanvas");
//Preparation for drawing with Babylon.js (Arguments: destination, anti-aliasing)
engine = new BABYLON.Engine(canvas, true);
//Create a scene (3D space) with camera and light settings
createScene();
//Update drawing every frame
engine.runRenderLoop(function () {
if (scene && scene.activeCamera) {
scene.render(); //Drawing!
}
});
}

Lesson06

24.

Operation Check Preview background becomes the specified color (=black)

25.
[beta]
Adding a Display Object
// Initialization of variables after page loading is completedう
window.onload = function() {
//Obtain the drawing area (canvas element) from HTML
canvas = document.getElementById("renderCanvas");
//Preparation for drawing with Babylon.js (Arguments: destination, anti-aliasing)
engine = new BABYLON.Engine(canvas, true);
//Create a scene (3D space) with camera and light settings
createScene();
//Creating Drawing Objects
addObjects();
//Update drawing every frame
engine.runRenderLoop(function () {
if (scene && scene.activeCamera) {
scene.render();
}
});
Lesson07
}

26.

Adding a Display Object Edit here next

27.
[beta]
Adding a Display Object
function addObjects(){

}

// Create ground (for visual checking the location of the origin.)
let ground = BABYLON.MeshBuilder.CreateGround(
"ground", {width: 1, height: 1});
//箱状のオブジェクト作成 (30cm)
let box = BABYLON.MeshBuilder.CreateBox(
"box", {width: 0.3, height: 0.3, depth: 0.3});
box.position.x = 0.0;
box.position.y = 1; //地⾯(ground)から1mの⾼さ
//マテリアルを作成
let boxMaterial = new BABYLON.StandardMaterial("material");
//箱の⾊を設定 (今回はランダムに変化)、そのあとboxに適⽤
boxMaterial.diffuseColor = BABYLON.Color3.Random();
box.material = boxMaterial;
//8⾯体を作成
let octa = BABYLON.MeshBuilder.CreatePolyhedron("octa", {type:1,size: 0.15});
octa.position.x=0.5;
octa.position.y=1;
Lesson08

28.

Operation Check The board that corresponds to the ground can be observed by changing the viewpoint with the mouse operation. Initial Viewpoint Left-click and drag to rotate Scroll back and forward Right-click and drag to move vertical/horizontal

29.
[beta]
Adding a Display Object
function addObjects(){

}

// Create ground (for visual checking the location of the origin.)
let ground = BABYLON.MeshBuilder.CreateGround(
"ground", {width: 1, height: 1});
// Creation of Box object (30cm)
let box = BABYLON.MeshBuilder.CreateBox(
"box", {width: 0.3, height: 0.3, depth: 0.3});
box.position.x = 0.0;
box.position.y = 1; // 1m above the ground
// Create Material
let boxMaterial = new BABYLON.StandardMaterial("material");
// Set the color of the box (in this case randomly changing) and apply it to the box
boxMaterial.diffuseColor = BABYLON.Color3.Random();
box.material = boxMaterial;
//8⾯体を作成
let octa = BABYLON.MeshBuilder.CreatePolyhedron("octa", {type:1,size: 0.15});
octa.position.x=0.5;
octa.position.y=1;
Lesson09

30.

Operation Check Box is shown

31.
[beta]
Adding a Display Object
function addObjects(){

}

//地⾯を作成 (原点の位置確認⽤。後で削除してOK)
let ground = BABYLON.MeshBuilder.CreateGround(
"ground", {width: 1, height: 1});
//箱状のオブジェクト作成 (30cm)
let box = BABYLON.MeshBuilder.CreateBox(
"box", {width: 0.3, height: 0.3, depth: 0.3});
box.position.x = 0.0;
box.position.y = 1; //地⾯(ground)から1mの⾼さ
//マテリアルを作成
let boxMaterial = new BABYLON.StandardMaterial("material");
//箱の⾊を設定 (今回はランダムに変化)、そのあとboxに適⽤
boxMaterial.diffuseColor = BABYLON.Color3.Random();
box.material = boxMaterial;
//8⾯体を作成 [詳細]
let octa = BABYLON.MeshBuilder.CreatePolyhedron("octa", {type:1,size: 0.15});
octa.position.x=0.5;
octa.position.y=1;
Lesson10

32.

Operation Check Box and octahedron is shown

33.

Exercise Procedure Web browser on PC Creation of 3D space HoloLens/Quest XR Mode Interaction by MRTK Visualize Hands

34.

Experience the Content on Quest or HoloLens2 window.onload = function() { /* Omitted */ //Creating Drawing Objects addObjects(); //Initialization of WebXR settings initializeXR(); } //Update drawing every frame engine.runRenderLoop(function () { if (scene && scene.activeCamera) { scene.render(); } }); //Initialization of WebXR settings async function initializeXR(){ let xr = await scene.createDefaultXRExperienceAsync({ /*options*/ }); } Lesson11

35.

Change the URL Before Testing on a Device Click Settings

36.

Change the URL Before Testing on a Device Edit project details Change the name to something easy to remember Save

37.

Check URL of Your XR Content Click Copy Link

38.

Check URL of Your XR Content Check the URL by pasting it into a text editor, etc. https://your-content.glitch.me/

39.

Operation Check HoloLens2 Input the URL Goggle Button Quest Input the URL Goggle Button

40.

Operation Check

41.

How to Exit HoloLens2 Home Button Quest Close Button Exit content via Home window shown by wrist tap (HoloLens2) or Oculus button (Quest)

42.

Exercise Procedure Web browser on PC Creation of 3D space HoloLens/Quest XR Mode Interaction by MRTK Visualize Hands

43.
[beta]
Object Manipulation
function addObjects(){
/*Omitted*/
// Set box color randomly
let boxMaterial = new BABYLON.StandardMaterial("material");
boxMaterial.diffuseColor = BABYLON.Color3.Random();
box.material = boxMaterial;
//Create an octahedron
let octa = BABYLON.MeshBuilder.CreatePolyhedron("octa", {type:1,size: 0.15});
octa.position.x=0.5;
octa.position.y=1;
//Add manipulatable attribute to the box object
let dragBehavior = new BABYLON.SixDofDragBehavior();
dragBehavior.allowMultiPointer = false;
dragBehavior.rotateWithMotionController = false;
box.addBehavior(dragBehavior);
}

Lesson12

44.

Operaton Check on PC Only objects to which DragBehavior is applied can be manipulated

45.

Operation Check on HMD Reload Reload Please click the Reload button everytime before testing

46.

Operation Check on HMD Quest users currently have hand tracking displaying hands incorrectly (to be fixed later)

47.

Exercise Procedure Web browser on PC Creation of 3D space HoloLens/Quest XR Mode Interaction by MRTK Visualize Hands

48.
[beta]
Turn On Hand Visualization (For Quest)
//Initialization of WebXR settings
async function initializeXR() {
let xr = await scene.createDefaultXRExperienceAsync({});
// Check if XR mode available or not
if (!xr.baseExperience) { }
else {
//Turn on hand tracking if XR mode available
xr.baseExperience.featuresManager.enableFeature(
BABYLON.WebXRFeatureName.HAND_TRACKING,
"latest",
{xrInput: xr.input}
);
}
}

Lesson13

49.

Operation Check on XR Device

50.

That's it for the basic steps!

51.

Extra Tutorial

52.

Using 3D Models (GLB, OBJ, etc.)

53.

Loading a 3D Model File Loading Libraries Enables the object loading functionality provided by Babylon.js

54.
[beta]
Loading a 3D Model File
<!– Loading babylon.js-->
<script src="https://cdn.babylonjs.com/babylon.js"></script>
<script src="https://cdn.babylonjs.com/loaders/babylonjs.loaders.min.js"></script>
<!-- Actual process implementation -->
<script type="text/javascript">
let canvas; //canvas element (drawing area) ← "where" to draw
let engine; //Drawing functionality with Babylon.js ← "What" to draw with
let scene; //Virtual 3D space ← "What" to draw
// Initialization of variables after page loading is completed
window.onload = function () {
//Obtain the drawing area (canvas element) from HTML
canvas = document.getElementById("renderCanvas");
//Preparation for drawing with Babylon.js (Arguments: destination, anti-aliasing)
engine = new BABYLON.Engine(canvas, true);
/*Omitted below */

Lesson14

55.

Upload 3D Model to Glitch Assets

56.

Upload 3D Model to Glitch Drag and drop in the browser figure.glb

57.

Upload 3D Model to Glitch Back to index.html

58.
[beta]
Loading a 3D Model File
function addObjects(){
/* Omitted due to space limitation. */
let boxMaterial = new BABYLON.StandardMaterial("material");
boxMaterial.diffuseColor = BABYLON.Color3.Random();
box.material = boxMaterial;
// Create octahedron
let octa = BABYLON.MeshBuilder.CreatePolyhedron("octa", {type:1,size: 0.15});
octa.position.x=0.5;
octa.position.y=1;
// Added a hand-grabable attribute to the box.
let dragBehavior = new BABYLON.SixDofDragBehavior();
dragBehavior.allowMultiPointer=false;
dragBehavior.rotateWithMotionController=false;
box.addBehavior(dragBehavior);
}

Add code to load object (next page)

59.

Loading a 3D Model File function addObjects(){ /* Omitted due to space limitation */ dragBehavior.rotateWithMotionController=false; box.addBehavior(dragBehavior); // Load 3D models using SceneLoader BABYLON.SceneLoader.LoadAssetContainer( "URL of 3D Model ", // Folder where the 3D model is placed OR URL of the 3D model "", //File name of the 3D model. Empty is OK if you specified the URL of the model above. scene, // Scene to which the object is added function (container) { //For Babylon.js, the 0th mesh is just the root; the 1st is the model entity.[Detail] let glbMesh = container.meshes[1]; //Add object to scene (3D space) scene.addMesh(glbMesh); } ); } Lesson15

60.

Getting the URL of 3D Model function addObjects(){ /* Omitted due to space limitation */ dragBehavior.rotateWithMotionController=false; box.addBehavior(dragBehavior); // Load 3D models using SceneLoader BABYLON.SceneLoader.LoadAssetContainer( "URL of 3D Model ", // Folder where the 3D model is placed OR URL of the 3D model "", //File name of the 3D model. Empty is OK if you specified the URL of the model above. scene, // Scene to which the object is added function (container) { //For Babylon.js, the 0th mesh is just the root; the 1st is the model entity.[Detail] let glbMesh = container.meshes[1]; //Add object to scene (3D space) scene.addMesh(glbMesh); } ); }

61.

Getting the URL of 3D Model Assets

62.

Getting the URL of 3D Model Click figure.glb

63.

Getting the URL of 3D Model Copy URL

64.

Getting the URL of 3D Model Close

65.

Getting the URL of 3D Model Back to index.html

66.

Loading a 3D Model File function addObjects(){ /* Omitted due to space limitation */ dragBehavior.rotateWithMotionController=false; box.addBehavior(dragBehavior); // Load 3D models using SceneLoader BABYLON.SceneLoader.LoadAssetContainer( "URL of 3D Model ", // Folder where the 3D model is placed OR URL of the 3D model "", //File name of the 3D model. Empty is OK if you specified the URL of the model above. Paste URL between " and ". scene, // Scene to which the object is added function (container) { //For Babylon.js, the 0th mesh is just the root; the 1st is the model entity.[Detail] let glbMesh = container.meshes[1]; //Add object to scene (3D space) scene.addMesh(glbMesh); } ); }

67.

Operation Checl Too Small

68.

Modification //Load 3D models using SceneLoader BABYLON.SceneLoader.LoadAssetContainer( "URL of 3D Model", // Folder where the 3D model is placed OR URL of the 3D model "", //File name of the 3D model. Empty is OK if you specified the URL of the model above. scene, //Scene to which the object is added function (container) { // For Babylon.js, the 0th mesh is just the root; the 1st is the model entity let glbMesh = container.meshes[1]; //Scale x10 glbMesh.scaling=new BABYLON.Vector3(10,10,10); //Add object to scene (3D space) scene.addMesh(glbMesh); } ); Lesson16

69.
[beta]
Modification
//Load 3D models using SceneLoader
BABYLON.SceneLoader.LoadAssetContainer(
"URL of 3D Model ", // Folder where the 3D model is placed OR URL of the 3D model
"", //File name of the 3D model. Empty is OK if you specified the URL of the model above.
scene, //Scene to which the object is added
function (container) {
// For Babylon.js, the 0th mesh is just the root; the 1st is the model entity
let glbMesh = container.meshes[1];
//Scale x10
glbMesh.scaling=new BABYLON.Vector3(10,10,10);
// Rotate 180 degrees (=π radians) around Y-axis (=vertical axis)
glbMesh.rotation =new BABYLON.Vector3(0, Math.PI, 0);
//Add object to scene (3D space)
scene.addMesh(glbMesh);
}
);

Lesson17

70.
[beta]
Make 3D Model Manipulatable
// Load 3D models using SceneLoader
BABYLON.SceneLoader.LoadAssetContainer( "URL of 3D Model", "", scene,
function (container) {
//For Babylon.js, the 0th mesh is just the root; the 1st is the model entity
let glbMesh = container.meshes[1];
// Scale x10
glbMesh.scaling=new BABYLON.Vector3(10,10,10);
//Rotate 180 degrees (=π radians) around Y-axis (=vertical axis)
glbMesh.rotation =new BABYLON.Vector3(0, Math.PI, 0);
// Create manipulation behavior for loaded objects
let dragBehavior2 = new BABYLON.SixDofDragBehavior();
dragBehavior2.allowMultiPointer=false;
dragBehavior2.rotateWithMotionController=false;
glbMesh.addBehavior(dragBehavior2);
//Add object to scene (3D space)
scene.addMesh(glbMesh);
}
);

Lesson18

71.

Operation Check

72.

参考 Camera https://doc.babylonjs.com/divingDeeper/cameras/camera_introduction WebXR Experience Helper https://doc.babylonjs.com/divingDeeper/webXR/webXRExperienceHelpers#webxr-defaultexperience-helper MRTK https://doc.babylonjs.com/divingDeeper/gui/mrtk SixDofDragBehaviour https://doc.babylonjs.com/typedoc/classes/BABYLON.SixDofDragBehavior Hand Tracking https://doc.babylonjs.com/divingDeeper/webXR/WebXRSelectedFeatures#hand-tracking SceneLoader https://doc.babylonjs.com/typedoc/classes/BABYLON.SceneLoader AR mode (Quest pass-through supported) https://doc.babylonjs.com/features/featuresDeepDive/webXR/webXRARFeatures#features

73.

Source code is available on GitHub https://github.com/TakashiYoshinaga/babylonjs-webxr