xrimagelost

Description

This event is emitted by xrweb when an image target is no longer being tracked.

imagelost.detail : { name, type, position, rotation, scale, scaledWidth, scaledHeight, height, radiusTop, radiusBottom, arcStartRadians, arcLengthRadians }

Property	Description
name	The image's name.
type	One of 'FLAT', 'CYLINDRICAL', 'CONICAL'.`
position: {x, y, z}	The 3d position of the located image.
rotation: {w, x, y, z}	The 3d local orientation of the located image.
scale	A scale factor that should be applied to object attached to this image.

If type = FLAT:

Property	Description
scaledWidth	The width of the image in the scene, when multiplied by scale.
scaledHeight	The height of the image in the scene, when multiplied by scale.

If type= CYLINDRICAL or CONICAL:

Property	Description
height	Height of the curved target.
radiusTop	Radius of the curved target at the top.
radiusBottom	Radius of the curved target at the bottom.
arcStartRadians	Starting angle in radians.
arcLengthRadians	Central angle in radians.

Example

AFRAME.registerComponent('my-named-image-target', {
  schema: {
    name: { type: 'string' }
  },
  init: function () {
    const object3D = this.el.object3D
    const name = this.data.name
    object3D.visible = false

    const showImage = ({detail}) => {
      if (name != detail.name) {
        return
      }
      object3D.position.copy(detail.position)
      object3D.quaternion.copy(detail.rotation)
      object3D.scale.set(detail.scale, detail.scale, detail.scale)
      object3D.visible = true
    }

    const hideImage = ({detail}) => {
      if (name != detail.name) {
        return
      }
      object3D.visible = false
    }

    this.el.sceneEl.addEventListener('xrimagefound', showImage)
    this.el.sceneEl.addEventListener('xrimageupdated', showImage)
    this.el.sceneEl.addEventListener('xrimagelost', hideImage)
  }
})