title: Larger normal vectors for PCL visualization
body: <p>I am using <code>NormalEstimation&lt;PointXYZ, Normal&gt;</code> to compute the normals for <code>PointCloud&lt;PointXYZ&gt;</code> and get <code>PointCloud&lt;PointNormal&gt;</code>. Afterwards, I use <code>addPointCloudNormals&lt;PointXYZ, Normal&gt;()</code> for my visualization to put the points and their normal vectors together. </p>
  
  <p>My visualization works, and I can see normal vectors corresponding the points in space. However they are too small and I was wondering if there is a way of making them more visible. An example to more visible normal vectors could be found at the official tutorials <a href="http://pointclouds.org/documentation/tutorials/normal_estimation.php" rel="nofollow">http://pointclouds.org/documentation/tutorials/normal_estimation.php</a>  </p>