title: Three.js load Multiple obj files one after another
body: <p>I'm using the obj/mtl loader provided by three.js to load several obj files including mtl. 
  Now I need to load multiple objs. But I need to load them one after another. I already used <code>THREE.DefaultLoadingManager.onProgress</code> to add a "Loading Screen". But how can I check for <code>loaded === total</code> within the loop for adding new objs. Or should I use a recursive function?</p>
  
  <p>Hope you can help me.
  Thanks</p>