title: How to draw mesh edges with Threejs
body: <p>I'm looking at drawing the edges of a mesh like on the following picture:</p>
  
  <p><img src="https://s3.postimg.org/c2a1wytyb/pic1.png" height="200"></p>
  
  <p>I tried to use THREE.EdgesHelper however it only groups the triangles that are in the same plane and therefore it looks like the wireframe on curved areas which I want to avoid.</p>
  
  <p>Ideally it would be some sort of helper that I could display/hide/change colour.</p>
  
  <p>I'm not exactly sure about what to look at for a starting point and your help would be much appreciated.</p>
  
  <p>Thank you!</p>