static getNoticeDotGeometry (radius) {
    return getOrSet(noticeDotGeometries, radius, () => {
      const noticeShape = new THREE.Shape();
      const dotRadius = radius * 0.5;
      noticeShape.moveTo(dotRadius, 0);
      noticeShape.absarc(0, 0, dotRadius, 0, 2 * Math.PI, false);
      return new THREE.ShapeGeometry(noticeShape, curveSegments);
    });
  }
Used for node notice dots/icons.
NOTE: Not all nodes will show notices dot depending on the renderer, the
 zoom level, and the type of node.  For example, at the global level the
 donut graph nodes will show the text overlay on hover, but not the icon.
 If at the service/node zoom level the notice dot and text show, unless you
 are using the DNS renderer.
   aSqrd-eSqrd, 21-May-2019