prite = new SpriteText(node.id);
          sprite.material.depthWrite = false; // make sprite background transparent
          sprite.color = node.color;
          sprite.textHeight = 8;
          sprite.center.y = -0.6; // shift above node
          return sprite;
        })
        .nodeThreeObjectExtend(true);

    // Spread nodes a little wider
    Graph.d3Force('charge').strength(-120);

  </script>
</body>