t this.load.gltf('book')
            const scene = object.scenes[0]

            const book = new ExtendedObject3D()
            book.name = 'scene'
            book.add(scene)
            this.add.existing(book)

            // add animations
            // sadly only the flags animations works
            object.animations.forEach((anim, i) => {
              book.mixer = this.animationMixers.create(book)
              // overwrite the action to be an array of actions
              book.action = []
      