title: Three.js Attach a label on the side of sphere
body: <p>I have 300 small spheres which represent human genes with relative 3D position. The question is: I need add a label to each sphere (label suppose attached on the side of sphere)to show the basic gene information, and the label can rotate with sphere when use rotates the camera.
  I cannot find any example online, please help!</p>
  
  <p>Any suggestion is highly appreciated!</p>