title: Drawing an open arc with three.js
body: <p>I am trying to draw an <strong>open</strong> arc with three.js using the code from an example in three.js docs.</p>
  
  <p>The problem with this code is that it draws a straight line from the end point of the arc back to its starting point. I wonder if there is a way to draw an open arc.</p>
  
  <p>I have tried various methods on <code>THREE.Path</code>, like <code>THREE.Path.ellipse</code>, but they all seem to do the same thing.</p>
  
  <pre><code>var curve = new THREE.EllipseCurve(
    0, 0,             // ax, aY
    7, 15,            // xRadius, yRadius
    0, 3/2 * Math.PI, // aStartAngle, aEndAngle
    false             // aClockwise
  );
  var path = new THREE.Path(curve.getPoints(50));
  var geometry = path.createPointsGeometry(50);
  var material = new THREE.LineBasicMaterial({color: 0x0000ff});
  var ellipse = new THREE.Line(geometry, material);
  this.scene.add(ellipse);
  </code></pre>