title: Finding Missing points from unorganised point cloud using PCL
body: <p>I wish to get the region (coordinates) of region that has no point data in the point cloud. I am using PCL library and inpput is .pcd file.</p>
  
  <p>Look at the visulaization. <a href="https://i.stack.imgur.com/Q67Hn.jpg" rel="nofollow noreferrer">Viewed in pcl viewer</a></p>
  
  <p>I need to extract only those black region (infact seems to be black as background was black)</p>
  
  <p>Some suggested to find NaN values. Bit the .pcd file does not seems to have such entries!</p>
  
  <p>Look at the data in the pcd file. <a href="https://i.stack.imgur.com/kXk0Y.jpg" rel="nofollow noreferrer">View of the data</a></p>
  
  <p>How do I do it?</p>
  
  <p>Help.</p>