# VTU and VTK extension files

**URL:** https://discourse.vtk.org/t/vtu-and-vtk-extension-files/4240
**Category:** Support
**Created:** [September 17, 2020, 10:39pm UTC](https://discourse.vtk.org/t/vtu-and-vtk-extension-files/4240 "2020-09-17T22:39:12Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![Luis\_Carlos\_Carneiro](https://discourse.vtk.org/user_avatar/discourse.vtk.org/luis_carlos_carneiro/32/1360_2.png) [@Luis\_Carlos\_Carneiro](https://discourse.vtk.org/u/Luis_Carlos_Carneiro)
#### Post date: [September 17, 2020, 10:39pm UTC](https://discourse.vtk.org/t/vtu-and-vtk-extension-files/4240/1 "2020-09-17T22:39:12Z")

</div>

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

---

<div class="post-metadata">

### Author: ![lassoan](https://discourse.vtk.org/user_avatar/discourse.vtk.org/lassoan/32/50_2.png) [@lassoan](https://discourse.vtk.org/u/lassoan)
#### Post date: [September 17, 2020, 11:31pm UTC](https://discourse.vtk.org/t/vtu-and-vtk-extension-files/4240/2 "2020-09-17T23:31:00Z")

</div>

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