Understanding how demo data is displayed in paraview

I have a demo data set that I can view in paraview. To export the data, I have to understand how paraview reads the data and creates the arrows. The demo data can be found here( Demo dataset for fetal whole-heart 4D reconstruction using real-time non-coplanar MRI stacks (figshare.com)
How does paraview read vtk and creates something from it?
Any help appreciated

Hi @sarisa19 ,

ParaView uses the vtkLegacyDataReader from VTK to read the data.

In itself, there is nothing special about it. Your data is structured, so it means the .vtk file contains only dimensions information and then a data for each point.