VTU and VTK extension files

Dear All,

Does .vtk extension files support volumetric (Tetrahedral) meshes? If so, where it can be found the specifications.

Where it can be found the specifications of .vtu files?

Thanks in Advance,

Luis Gonçalves

Luis Gonçalves

VTK file format specification is available here:
https://vtk.org/wp-content/uploads/2015/04/file-formats.pdf