title: PCL: how to plot a directional line
body: <p>I have built a point cloud and of an object and have estimated the pose and would like to add a directional line to the visualization from the centre point (xyz) pointing in the direction of pose (pitch, yaw, roll). </p>
  
  <p>However, I can't find any examples of this online and am very new to the pcl library. </p>
  
  <p>I have seen the plotting normals example however, this is different.</p>
  
  <p>Any help is appreciated.</p>
  
  <p>Thanks</p>