VTK mesh 

Menu: Files->Import->VTK mesh...

With this option it is possible to read VTK files, with .vtk extension.

This importer/exporter is now implemented in the C++ kernel, not as a Tcl plugin as before, based on the VTK package (Visualization Toolkit library), and updated to VTK 9.3

The file information is converted into preprocess mesh. They are supported unstructured and cartesian meshes.

There is an extra option:
Merge: to add the mesh to the current mesh, else current model is erased.