example/text-links/index.html

<head>
  <style> body { margin: 0; } </style>

  <script src="//unpkg.com/3d-force-graph"></script>
  <!--<script src="../../dist/3d-force-graph.js"></script>-->
</head>

<body>
  <div id="3d-graph"></div>

  <script type="module">
    import SpriteText from "https://esm.sh/three-spritetext";

    const Graph = new ForceGraph3D(document.getElementById('3d-graph'))
        .jsonUrl('../datasets/miserables.json')
        .nodeLabel('id')
        .nodeAutoColorBy('group')
        .linkThreeObjectExtend(true)
        .linkThreeObject(link => {
          // extend link with text sprite
          const sprite = new SpriteText(`${link.source} > ${link.target}`);
          sprite.color = 'lightgrey';
          sprite.textHeight = 1.5;
          return sprite;
        })
        .linkPositionUpdate((sprite, { start, end }) => {
          const middlePos = Object.assign(...['x', 'y', 'z'].map(c => ({
            [c]: start[c] + (end[c] - start[c]) / 2 // calc middle point
          })));

          // Position sprite
          Object.assign(sprite.position, middlePos);
        });

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

  </script>
</body>