})

  session.on('updateAnchors', anchors => {

    console.log('update anchor')

    const map = anchors.reduce((temp, item) => {

      temp[item.id] = item

      return temp

    }, {})

    this.planeBox.children.forEach(object => {

      if (object._id && map[object._id]) {

        const anchor = map[object._id]

        const size = anchor.size

        if (size && object._size && (size.width !== object._size.width || size.height !== object._size.height)) {

          this.planeBox.remove(object)

          object = createPlane(size)

          this.planeBox.add(object)

        }

​

        object._id = anchor.id

        object._size = size

        updateMatrix(object, anchor.transform)

      }

    })

  })

  session.on('removeAnchors', anchors => {

    console.log('remove anchor')

    const map = anchors.reduce((temp, item) => {

      temp[item.id] = item

      return temp

    }, {})

    this.planeBox.children.forEach(object => {

      if (object._id && map[object._id]) this.planeBox.remove(object)

    })

  })