title: Visaulize several .vtk files together in Paraview
body: <p>I am running some simulations on Matlab and then passing them to Paraview using .vtk files. I would like to see all three .vtk files together in Paraview screen but it seems like I can visualise them only one by one, not together. </p>
  
  <p>Anyone knows how to solve this? </p>
  
  <p>Thanks in advance.  </p>