position.y = bodyHeight + headRadius * 1.1;

-  const label = new THREE.Mesh(labelGeometry, labelMaterial);
+  const label = new THREE.Sprite(labelMaterial);
  root.add(label);
  label.position.y = bodyHeight * 4 / 5;
  label.position.z = bodyRadiusTop * 1.01;</pre>
        <p>现在标签始终是面向相机了。</p>
        <p></p>
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