title: How to visualize vtk data set with only point data
body: <p>I have a vtk dataset with only point data but no cell data. I would like to visualize the dataset as point cloud. When I read the dataset as polyData it wouldn’t show anything on the screen. One work around I did was first writing the dataset as .xyz files, then read from the .xyz files and visualize. Another way I came up with is inserting the points as vertices manually. </p>
  
  <p>Are there any neater ways to achieve this goal? </p>
  
  <p>Thank you very much!</p>