A-Frame Attributes

Refer custom HTML attributes that can be utilized

Introduction

These are Blippar WebAR SDK’s custom HTML attributes that are used with A-Frame’s Entity and Scene. They are available to use after the WebAR SDK script has been loaded.

A-Frame

webar-camera

Usage

<a-camera webar-camera> </a-camera>

<a-entity camera webar-camera> </a-entity>

Description

When A-Frame’s <a-entity camera> or <a-camera> is added with the webar-camera attribute, it becomes the WebAR camera for surface tracking.

Example

<a-camera webar-camera></a-camera>

Only a single A-Frame camera is supported.

webar-face (Face Tracking)

Usage

<a-entity webar-face> </a-entity>

To be used once with a parent entity of all of the 3D model entities that have to be positioned w.r.t the tracked face.

Description

When an A-Frame’s topmost parent a-entity in a scene is added with the webar-face attribute, it becomes a stage for the 3D models that have to be displayed on the face tracking WebAR scene. In other words, all the 3D model entities have to be added as children to this <a-entity webar-face> element.. The center point between the line connecting the eyes, shown as the red dot in the image, is the origin of the element.

Note

Only one <a-entity webar-face> is supported.

Example

<a-entity webar-face>
  <a-entity gltf-model="..."></a-entity>
</a-entity>

webar-facemesh (Face Tracking)

Usage

<a-plane webar-facemesh> </a-plane>

To be used once with a <a-plane> element .

Description

When an A-Frame’s topmost parent a-entity in a scene is added with the webar-facemesh attribute, it becomes a masked mesh for the tracked face WebAR scene. It can be used to apply image or video textures, occluder or any desired material to this <a-entity webar-facemesh> element, in order to create AR experiences like lipstick try-on, realtime face swap, etc.

Note

Only one <a-entity webar-facemesh> is supported.

Example

<a-entity webar-facemesh material="src: #liptexture; side: front; alphaTest: 0; color: #E32531; shader: flat; transparent: true; opacity: 1;"></a-entity>

Face mesh has to use the following Canonical Face model layout as its texture UV map.

Sample Face mesh textures are shown below:

webar-face-pivot (Face Tracking)

Usage

<a-entity webar-face-pivot> </a-entity>

Description

It allows an entity to move in sync with the user’s head movements, without rotating with the head. This enhances the realism and interactivity of AR experiences.

Example

<a-entity webar-face-pivot>
  <a-entity gltf-model="#pumpkin" rotation="0 30 0" position="-0.75 -0.25 1" scale="0.01 0.01 0.01" webar-loadmonitor="elType: glb"></a-entity>
</a-entity>

webar-loadmonitor

Usage

<a-entity webar-loadmonitor> </a-entity>

Used by the entities that are loading an asset.

Description

Monitors the loaded state of an asset in an A-Frame entity. The initial loading progress bar will be displayed until all of these assets are loaded and after the camera video appears on screen.

For faster loading times and to ensure entities have been fully loaded before showing the scene the elType property should be defined, default value is 'none'. Values are shown in the table below.

Properties

Property	Value
elType:	<one of the elType enum values>

Property

Value

elType:

Enum Values

elType enum values	A-Frame’s Event listened
glb	model-loaded
obj	model-loaded
asset	loaded
texture	materialtextureloaded
video	materialvideoloadeddata
none	Waits for 500 ms

elType enum values

A-Frame’s Event listened

glb

model-loaded

obj

model-loaded

asset

loaded

texture

materialtextureloaded

video

materialvideoloadeddata

none

Waits for 500 ms

Example

<a-assets>
  <a-asset-item 
    id="astronaut" 
    src="models/astronaut.glb">
  </a-asset-item>
</a-assets>

<a-entity
  gltf-model="#astronaut" id="astronaut_1"
  rotation="0 0 0" position="0 0 0" scale="0.25 0.25 0.25"
  webar-loadmonitor="elType: glb">
</a-entity>

webar-marker (Marker Tracking)

Usage

<a-entity webar-marker="id: dddddddd-uuuu-mmmm-mmmm-yyyyyyy11111"> </a-entity>
<a-entity webar-marker="id: dddddddd-uuuu-mmmm-mmmm-yyyyyyy22222"> </a-entity>
...

To be used with a parent entity of the 3D model entities that have to be displayed on a marker image.

Description

When an A-Frame’s topmost parent a-entity in a scene is added with the webar-marker attribute, it becomes the placeholder for the 3D models that have to be displayed over the image of the corresponding marker id specified as the value of the id: property.

Up to 10 markers can be uploaded per WebAR SDK Project (or license) in the Blippar Marker Manager. Each marker image can be linked to an AFrame's <a-entity webar-marker="id: <marker_id>"> by replacing <marker_id> with a valid marker id obtained from the Blippar Marker manager after uploading an image.

The number of <a-entity webar-marker="id: <marker_id>"> elements should match with the number of marker images uploaded in the Blippar Marker Manager. Each <a-entity webar-marker="id: <marker_id>"> should have a unique <marker_id> obtained for each uploaded image in the Blippar Marker Manager.

Properties

Property	Value
id:	Marker id value obtained from the Blippar Manager after uploading an image.

Property

Value

id:

Marker id value obtained from the Blippar Manager after uploading an image.

When the webar-mode="marker-tracking" attribute is set in the WebAR SDK <script> tag, at least one <a-entity webar-marker="id: <marker_id>"> element is expected.
If any of the marker images uploaded to Blippar Marker Manager is not linked with a <a-entity webar-marker="id: ..."> element, then any one of the models from the existing <a-entity webar-marker="id: <marker_id>"> in the scene will be displayed when scanning that image for marker tracking.

Example

<a-entity webar-marker="id: dddddddd-uuuu-mmmm-mmmm-yyyyyyy11111">
  <a-entity gltf-model="..."></a-entity>
  <a-entity geometry="..."></a-entity>
</a-entity>

<a-entity webar-marker="id: dddddddd-uuuu-mmmm-mmmm-yyyyyyy22222">
 <a-entity gltf-model="..."></a-entity>
 <a-entity geometry="..."></a-entity>
</a-entity>

...

webar-raycaster

Usage

<a-scene webar-raycaster="objects: .clickable; enabled: true;"> </a-scene>

Description

A specialized attribute for improved AR interaction in face-tracking mode. Developers can now use el.addEventListener('click', (evt) => {}) to receive raycast events. This attribute replaces AFrame’s native raycaster and cursor attributes in face tracking mode, addressing compatibility issues with AFrame’s built-in raycaster component in face-tracking scenarios. Our custom raycaster component ensures better performance and reliability.

Example

<a-scene
      webar-scene="key: <%= htmlWebpackPlugin.options.licenseKey %>"
      webar-raycaster="objects: .clickable; enabled: true;"
      vr-mode-ui="enabled: false"
      device-orientation-permission-ui="enabled: false"
      loading-screen="enabled: false"
      renderer="colorManagement: false; antialias: true; physicallyCorrectLights: false;">

webar-scene

Usage

<a-scene webar-scene="key: ..."></a-scene>

Description

When A-Frame’s a-scene is added with the webar-scene attribute, it becomes the WebAR scene for surface tracking.

Properties

Property	Value
Key:	<License key purchased from Blippar>

Property

Value

Key:

Example

<a-scene
webar-scene="key:xxxxxxxx-1111-2222-3333-yyyyyyyyyyyy"
vr-mode-ui="enabled: false"
device-orientation-permission-ui="enabled: false"
loading-screen="enabled: false">

In the above example, ‘xxxxxxxx-1111-2222-3333-yyyyyyyyyyyy’, has to be replaced with your website domain’s license.
The license key can only be used on a HTTPS server that has the same public domain name for which the license was purchased or for a local HTTPS server that has the same private IP address as the domain name. Please see the Local Development Guide for more details.
Please use the values of the attributes ‘vr-mode-ui’, ‘device-orientation-permission-ui’ and ‘loading-screen’ as shown in the above example.

webar-stage (Surface Tracking)

Usage

<a-entity webar-stage> </a-entity>

To be used once with a parent entity of all of the 3D model entities that have to be displayed on the surface tracking scene.

Description

When an A-Frame’s topmost parent a-entity in a scene is added with the webar-stage attribute, it becomes a stage for the 3D models that have to be displayed on the surface tracking WebAR scene. In other words, all the 3D model entities have to be added as children to this <a-entity webar-stage> element.

Note

Only one <a-entity webar-stage> is supported.

Example

<a-entity webar-stage>
  <a-entity gltf-model="..."></a-entity>
  <a-entity geometry="..."></a-entity>
</a-entity>

webar-ux-control (Surface Tracking)

Usage

<a-entity webar-ux-control> </a-entity>

Description

Enhances the AR experience by adding a stage cursor that allows users to place the AR model precisely by tapping on the screen. It activates a stage cursor for model placement (stageCursorUX: true) and allows intuitive user interactions with the model through rotation and scaling (userGestureRotation: true; userGestureScale: true).

To utilize the webar-ux-control functionality effectively, it is essential to configure this element as a child of the webar-stage. Additionally, all other entities, such as the scene's 3D models, must be nested as children within this structure to ensure proper implementation of the webar-ux-control features.

Attributes

Attribute	Value
stageCursorUX	boolean
userGestureRotation	boolean
userGestureScale	boolean

Attribute

Value

stageCursorUX

boolean

userGestureRotation

boolean

userGestureScale

boolean

Example

<body>
   
   ...

    <a-entity webar-stage>
       <a-entity webar-ux-control="stageCursorUX: true; userGestureRotation: true; userGestureScale: true">
       <!-- Place 3D AR models here -->
       </a-entity>
    </a-entity>

  </a-scene>
</body>

id="webar-video-plane" (Face Tracking)

Usage

<a-entity id="webar-video-plane" color="#ffffff"> </a-entity>

To be used once with a <a-plane> entity. This is an optional id attribute. If not provided, sdk displays the normal webcam video layer in the AR scene backdrop by default. Description

When an A-Frame’s topmost parent a-plane in a scene is added with the id="webar-video-plane" attribute, it becomes the webcam video layer displayed on the backdrop of face tracking WebAR scene. It can be used only to change the color of the webcam video background to suit the experience, for example, add color="#ff0000" attribute to show a bluish video. It's visibility can be also be set to false to display a white background(default color of the a-scene).

Note

Only one <a-entity id="webar-video-plane"> is supported.

Example

  <a-plane id="webar-video-plane" color="#ff0000" visible="true"></a-plane>

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