constructor (parent) {
    super(parent)

    this.xrInputSource = null
    this.bodyColor = 0x999999
    this.buttonColor = 0xffffff
    this.buttonActiveColor = 0xccffcc
    this.emissiveIntensity = 0.3
  }
@property bodyColor
@property emissive
@property emissiveIntensity
@property buttonColor
@property buttonActiveColor