The document discusses the development of virtual and augmented reality applications using the WebXR Device API, focusing on UX design principles and implementation strategies. Key topics include device capability detection, session management, and best practices for user comfort and safety in AR/VR environments. It emphasizes the importance of providing feedback, guiding users with gaze cues, and respecting user space to prevent discomfort and enhance the overall experience.

1. @fischaelameergeildanke.com #YGLFKyiv18
Writing VR and AR Apps
with Web Technology

2. WebXR Device API
UX Design for WebXR
ReactVR ReactAR

3. WebXR
WebVR WebAR

4. Created by Laura Hernández from the Noun Project

5. Completely DigitalVirtual Reality

6. Virtual Overlay
Augmented Reality:

7. Virtual and Real World Coincide
Mixed Reality

8. WebXR
WebVR WebAR

9. WebXR Device API
Detect AR/VR Devices
9
Get Device’s Capabilities
Get Device’s Orientation/Position
Display Images With A Fitting Frame Rate

10. WebVR API
WebXR Device API

11. WebXR Device API
Supports Augmented Reality
11
Clean, Consistent, Predictable
Better Browser Optimizations
Unified Input Model

12. Lifetime of a WebXR App
Request XR Device
Reveal XR Functionality
Request XR Session
Run Render Loop

13. Request a XR Devices
navigator.xr.requestDevice().then(device => {
if (device) {
handleXRAvailable(device);
}
}).catch(error =>
console.error('Unable to request an XR device: ', error);
});

14. Request a XR Devices
navigator.xr.requestDevice().then(device => {
if (device) {
handleXRAvailable(device);
}
}).catch(error =>
console.error('Unable to request an XR device: ', error);
});

15. Check XR Session Support
let xrDevice = null;
function handleXRAvailable(device) {
xrDevice = device;
xrDevice.supportsSession({exclusive: true}).then(() => {
addWebXRButtonToPage();
}).catch((error) => {
console.log('Session not supported: ' + error);
});
}

16. Check XR Session Support
let xrDevice = null;
function handleXRAvailable(device) {
xrDevice = device;
xrDevice.supportsSession({exclusive: true}).then(() => {
addWebXRButtonToPage();
}).catch((error) => {
console.log('Session not supported: ' + error);
});
}

17. Check XR Session Support
let xrDevice = null;
function handleXRAvailable(device) {
xrDevice = device;
xrDevice.supportsSession({exclusive: true}).then(() => {
addWebXRButtonToPage();
}).catch((error) => {
console.log('Session not supported: ' + error);
});
}

18. Request a XR Session
function beginXRSession() {
let canvas = document.createElement('canvas');
let context = canvas.getContext('xrpresent');
document.body.appendChild(canvas);
xrDevice.requestSession({exclusive: true, outputContext: context})
.then(onSessionStarted)
.catch((error) => {console.log('requestSession failed: ' + error);});
}

19. Start a XR Session
let xrSession = null;
let xrFrameOfReference = null;
function onSessionStarted(session) {
xrSession = session;
xrSession.requestFrameOfReference('eyeLevel')
.then((frameOfReference) => {xrFrameOfReference = frameOfReference;})
.then(setupWebGLLayer)
.then(() => {xrSession.requestAnimationFrame(onRenderFrame);});
}

20. Start a XR Session
let xrSession = null;
let xrFrameOfReference = null;
function onSessionStarted(session) {
xrSession = session;
xrSession.requestFrameOfReference('eyeLevel')
.then((frameOfReference) => {xrFrameOfReference = frameOfReference;})
.then(setupWebGLLayer)
.then(() => {xrSession.requestAnimationFrame(onRenderFrame);});
}

21. Setup an XRLayer
let glCanvas = document.createElement('canvas');
let glContext = glCanvas.getContext('webgl');
function setupWebGLLayer() {
return glContext.setCompatibleXRDevice(xrDevice).then(() => {
xrSession.baseLayer = new XRWebGLLayer(xrSession, glContext);
});
}

22. Setup an XRLayer
let glCanvas = document.createElement('canvas');
let glContext = glCanvas.getContext('webgl');
function setupWebGLLayer() {
return glContext.setCompatibleXRDevice(xrDevice).then(() => {
xrSession.baseLayer = new XRWebGLLayer(xrSession, glContext);
});
}

23. Start a XR Session
let xrSession = null;
let xrFrameOfReference = null;
function onSessionStarted(session) {
xrSession = session;
xrSession.requestFrameOfReference('eyeLevel')
.then((frameOfReference) => {xrFrameOfReference = frameOfReference;})
.then(setupWebGLLayer)
.then(() => {xrSession.requestAnimationFrame(onRenderFrame);});
}

24. Start the Render Loop
function onRenderFrame(timestamp, xrFrame) {
let pose = xrFrame.getDevicePose(xrFrameOfReference);
if (pose) {
for (let view of xrFrame.views) {
// Draw something
}
}
// Input device code
xrSession.requestAnimationFrame(onRenderFrame);
}

25. Start the Render Loop
function onRenderFrame(timestamp, xrFrame) {
let pose = xrFrame.getDevicePose(xrFrameOfReference);
if (pose) {
for (let view of xrFrame.views) {
// Draw something
}
}
// Input device code
xrSession.requestAnimationFrame(onRenderFrame);
}

26. Start the Render Loop
function onRenderFrame(timestamp, xrFrame) {
let pose = xrFrame.getDevicePose(xrFrameOfReference);
if (pose) {
for (let view of xrFrame.views) {
// Draw something
}
}
// Input device code
xrSession.requestAnimationFrame(onRenderFrame);
}

27. Start the Render Loop
function onRenderFrame(timestamp, xrFrame) {
let pose = xrFrame.getDevicePose(xrFrameOfReference);
if (pose) {
for (let view of xrFrame.views) {
// Draw something
}
}
// Input device code
xrSession.requestAnimationFrame(onRenderFrame);
}

28. Exit the WebXR Session
function endXRSession() {
if (xrSession) {xrSession.end().then(onSessionEnd);}
}
function onSessionEnd() {
xrSession = null;
window.requestAnimationFrame(onDrawFrame);
}

29. Exit the WebXR Session
function endXRSession() {
if (xrSession) {xrSession.end().then(onSessionEnd);}
}
function onSessionEnd() {
xrSession = null;
window.requestAnimationFrame(onDrawFrame);
}

32. Fallback: Magic Window
let mwCanvas = document.createElement('canvas');
let mwContext = mwCanvas.getContext('xrpresent');
document.body.appendChild(mwCanvas);
function beginMagicWindowXRSession() {
xrDevice.requestSession({exclusive: false, outputContext: mwContext})
.then(OnSessionStarted)
.catch((error) => {console.log('requestSession failed: ' + error);});
}

33. On Page Load:
Magic Window
exclusive sessions are supported
Render a
"Start VR" Button

34. Progressive Enhancement
6DOF VR Headset
AR-ready Smartphone
3DOF VR Headset
Magic Window
Gyroscope
WebXR Polyfill
Static Image
Created by Hans Gerhard Meier, Bence Bezeredy, Laura Hernández, Anil, Sachin Modgekar, Ben Davis from the Noun Project

35. The Future: Augmented Reality
AR Session Hit Test AR Anchors

36. Using Markerless AR Today
ARKit
by Apple
ARCore
by Google
World/Motion Tracking Scene Analyzation Light Estimation

37. Using Markerless AR Today
ARKit
by Apple
ARCore
by Google
WebAROnARKit WebAROnARCore
Two Experimental Browser Apps
https://github.com/google-ar/WebARonARKit https://github.com/google-ar/WebARonARCore

38. https://aframe.io/

39. <script src="aframe.min.js"></script>
<script src="three.ar.js"></script>
<script src="aframe-ar.js"></script>
Markerless AR with A-Frame

40. <script src="aframe.min.js"></script>
<script src="three.ar.js"></script>
<script src="aframe-ar.js"></script>
Markerless AR with A-Frame

41. <script src="aframe.min.js"></script>
<script src="three.ar.js"></script>
<script src="aframe-ar.js"></script>
Markerless AR with A-Frame

42. <script src="aframe.min.js"></script>
<script src="three.ar.js"></script>
<script src="aframe-ar.js"></script>
Markerless AR with A-Frame

43. <script src="aframe.min.js"></script>
<script src="three.ar.js"></script>
<script src="aframe-ar.js"></script>
Markerless AR with A-Frame
<script src="components/intersection-marker.js"></script>
<script src="components/shadow-material.js"></script>
<script src="components/ar-pet.js"></script>

44. <script src="aframe.min.js"></script>
<script src="three.ar.js"></script>
<script src="aframe-ar.js"></script>
Markerless AR with A-Frame
<script src="components/intersection-marker.js"></script>
<script src="components/shadow-material.js"></script>
<script src="components/ar-pet.js"></script>

45. <a-scene ar>
<a-assets>
<a-asset-item id="pet" src="assets/scene.gltf"></a-asset-item>
</a-assets>
<a-entity light="type:directional; castShadow:true;"></a-entity>
<a-ar-pet></a-ar-pet>
<a-intersection-marker></a-intersection-marker>
<a-camera user-height="0" ar-raycaster></a-camera>
</a-scene>
Markerless AR with A-Frame

46. <a-scene ar>
<a-assets>
<a-asset-item id="pet" src="assets/scene.gltf"></a-asset-item>
</a-assets>
<a-entity light="type:directional; castShadow:true;"></a-entity>
<a-ar-pet></a-ar-pet>
<a-intersection-marker></a-intersection-marker>
<a-camera user-height="0" ar-raycaster></a-camera>
</a-scene>
Markerless AR with A-Frame

47. <a-scene ar>
<a-assets>
<a-asset-item id="pet" src="assets/scene.gltf"></a-asset-item>
</a-assets>
<a-entity light="type:directional; castShadow:true;"></a-entity>
<a-ar-pet></a-ar-pet>
<a-intersection-marker></a-intersection-marker>
<a-camera user-height="0" ar-raycaster></a-camera>
</a-scene>
Markerless AR with A-Frame

48. <a-scene ar>
<a-assets>
<a-asset-item id="pet" src="assets/scene.gltf"></a-asset-item>
</a-assets>
<a-entity light="type:directional; castShadow:true;"></a-entity>
<a-ar-pet></a-ar-pet>
<a-intersection-marker></a-intersection-marker>
<a-camera user-height="0" ar-raycaster></a-camera>
</a-scene>
Markerless AR with A-Frame

49. <a-scene ar>
<a-assets>
<a-asset-item id="pet" src="assets/scene.gltf"></a-asset-item>
</a-assets>
<a-entity light="type:directional; castShadow:true;"></a-entity>
<a-ar-pet></a-ar-pet>
<a-intersection-marker></a-intersection-marker>
<a-camera user-height="0" ar-raycaster></a-camera>
</a-scene>
Markerless AR with A-Frame

51. Markerless AR with A-Frame
AFRAME.registerComponent('intersectionmarker', {
init: function () {
let mark = document.createElement('a-sphere');
mark.setAttribute('radius', '0.02');
mark.setAttribute('color', 'tomato');
this.el.appendChild(mark);
}
});

52. Markerless AR with A-Frame
AFRAME.registerComponent('intersectionmarker', {
init: function () {
let mark = document.createElement('a-sphere');
mark.setAttribute('radius', '0.02');
mark.setAttribute('color', 'tomato');
this.el.appendChild(mark);
}
});

53. Markerless AR with A-Frame
AFRAME.registerComponent('intersectionmarker', {
init: function () {
/* … */
let raycaster = document.querySelector('[ar-raycaster]');
raycaster.addEventListener('raycaster-intersection', function (e) {
mark.setAttribute('position', e.detail.intersections[0].point);
mark.setAttribute('color', 'lightseagreen');
});
}
});

54. Markerless AR with A-Frame
AFRAME.registerComponent('intersectionmarker', {
init: function () {
/* … */
let raycaster = document.querySelector('[ar-raycaster]');
raycaster.addEventListener('raycaster-intersection', function (e) {
mark.setAttribute('position', e.detail.intersections[0].point);
mark.setAttribute('color', 'lightseagreen');
});
}
});

56. UX Design for WebXR Apps

57. Do Not Apply 2D Patterns

58. No Established Patterns Yet

59. UX Design Best-Practises
Add Feedback, Respond Immediately

60. Add Feedback

61. It was the pioneer days; people had to make their own interrogation rooms. Out of
cornmeal. These endless days are finally ending in a blaze. When I say, 'I love you,'
it's not because I want you or because I can't have you. It's my estimation that every
man ever got a statue made of him was one kind of sommbitch or another. Oh my god you
will never believe what happened at school today. From beneath you, it devours. I am
never gonna see a merman, ever.
It was supposed to confuse him, but it just made him peppy. It was like the Heimlich,
with stripes! How did your brain even learn human speech? I'm just so curious.
Apocalypse, we've all been there; the same old trips, why should we care? Frankly, it's
ludicrous to have these interlocking bodies and not...interlock. I just don't see why
everyone's always picking on Marie-Antoinette. You're the one freaky thing in my freaky
world that still makes sense to me. You are talking crazy-person talk.

63. It was the pioneer days; people had to make their own interrogation rooms. Out of
cornmeal. These endless days are finally ending in a blaze. When I say, 'I love you,'
it's not because I want you or because I can't have you. It's my estimation that every
man ever got a statue made of him was one kind of sommbitch or another. Oh my god you
will never believe what happened at school today. From beneath you, it devours. I am
never gonna see a merman, ever.
It was supposed to confuse him, but it just made him peppy. It was like the Heimlich,
with stripes! How did your brain even learn human speech? I'm just so curious.
Apocalypse, we've all been there; the same old trips, why should we care? Frankly, it's
ludicrous to have these interlocking bodies and not...interlock. I just don't see why
everyone's always picking on Marie-Antoinette. You're the one freaky thing in my freaky
world that still makes sense to me. You are talking crazy-person talk.

65. UX Design Best-Practises
Add Feedback, Respond Immediately
Guide Users with Gaze Cues

66. Add Gaze Cues

67. UX Design Best-Practises
Add Feedback, Respond Immediately
Guide Users with Gaze Cues
Provide Information in Context

68. DoDon’t

69. Presence
Interpretability
Usefulness
Delight
Beau Cronin
https://medium.com/@beaucronin/the-hierarchy-of-needs-in-virtual-reality-development-4333a4833acc
Comfort

70. Presence
Interpretability
Usefulness
Delight
Beau Cronin
https://medium.com/@beaucronin/the-hierarchy-of-needs-in-virtual-reality-development-4333a4833acc
Comfort & Safety

71. Comfort and Safety in AR
There is No Optimal AR Environment

72. Comfort and Safety in AR
There is No Optimal AR Environment
Consider a User’s Movement

73. https://giphy.com/gifs/hyperrpg-vr-ouch-3oKIPAKenYskqXzYnC

74. Comfort and Safety in AR
There is No Optimal AR Environment
Consider a User’s Movement
Avoid Fatiguing your Users

75. Comfort and Safety in VR
Do Not Trigger Phobias

77. Comfort and Safety in VR
Do Not Trigger Phobias
Do Not Move Things Fast Towards the Camera

79. Comfort and Safety in VR
Do Not Trigger Phobias
Do Not Move Things Fast Towards the Camera
Respect a User’s Safe Space

80. https://www.reddit.com/r/VRFail/comments/4s7nc1/friend_loses_his_vrginity_and_then_some_crappy/

81. https://www.techradar.com/

82. https://www.reddit.com/r/VRFail/comments/4p9zgj/pool_shot/

83. Prevent Simulation Sickness
Do Not Move the Horizon or the Camera
Do Not Use Acceleration

84. https://web.colby.edu/cogblog/2016/05/09/2451/

85. Prevent Simulation Sickness
Do Not Move the Horizon or the Camera
Do Not Use Acceleration
Avoid Flicker and Blur
Add a Stable Focus Point

86. @fischaelameergeildanke.com #YGLFKyiv18
Respect Your Users!
Test Your Product on a Diverse Audience.

87. @fischaelameergeildanke.com #YGLFKyiv18
Get Involved!
https://github.com/immersive-web/webxr