title: How to improve shadow quality in three.js
body: <p>I have several object in a scene. And I want them moving on a wide plane, which will receive shadows. If I use only one point light or a very large directional light the shadow of a object when it moved to the corner will become very rough (rough shadow edge) . like this:
  <a href="https://i.stack.imgur.com/cdBl6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cdBl6.png" alt="shadow with rough edge"></a></p>
  
  <p>So I’m wondering should I use a light for every object above them and follow them in order to cast a high quality shadow edge? And in some case I can not set the shadow.mapsize higher .</p>