title: three.js EdgesHelper showing certain diagonal lines on Collada model
body: <p>I'm using <a href="http://threejs.org/docs/#Reference/Extras.Helpers/EdgesHelper" rel="nofollow noreferrer">EdgesHelper</a> on a simple model that I exported from SketchUp. It is showing some diagonal lines like this:</p>
  
  <p><img src="https://i.stack.imgur.com/hmn3e.jpg" alt="image"></p>
  
  <p>How do I prevent those lines from appearing, so that the edges looks like what it appears in SketchUp? I tried setting the <code>thresholdAngle</code> but it doesn't help.</p>
  
  <p><strong>Update:</strong></p>
  
  <p>Working demo: <a href="http://jsfiddle.net/alan0xd7/6vLm5xsa/" rel="nofollow noreferrer">http://jsfiddle.net/alan0xd7/6vLm5xsa/</a></p>
  
  <p>This is the look I am trying to achieve:</p>
  
  <p><img src="https://i.stack.imgur.com/hG28u.jpg" alt="image"></p>