title: Cache scene in Three.js
body: <p>PIXI.js has <code>Container#cacheAsBitmap</code> which causes the container to "render" itself to an image, save that, render the image instead of its children and when a child is added or removed or updated, the cache is updated.</p>
  
  <p>What's the alternative for Three.js (but instead of an image it would be a mesh)?</p>