disconnectedCallback() {
    var componentName;
    if (!this.parentEl) {
      return;
    }

    // Remove components.
    for (componentName in this.components) {
      this.removeComponent(componentName, false);
    }
    if (this.isScene) {
      return;
    }
    this.removeFromParent();
    super.disconnectedCallback();

    // Remove cyclic reference.
    this.object3D.el = null;
  }
Tell parent to remove this element's object3D from its object3D.
Do not call on scene element because that will cause a call to document.body.remove().