# VTKHDF vtkStructuredGrid support

**URL:** https://discourse.vtk.org/t/vtkhdf-vtkstructuredgrid-support/15920
**Category:** Development
**Created:** [August 5, 2025, 12:53pm UTC](https://discourse.vtk.org/t/vtkhdf-vtkstructuredgrid-support/15920 "2025-08-05T12:53:50Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![mwestphal](https://discourse.vtk.org/user_avatar/discourse.vtk.org/mwestphal/32/19_2.png) [@mwestphal](https://discourse.vtk.org/u/mwestphal)
#### Post date: [August 5, 2025, 12:53pm UTC](https://discourse.vtk.org/t/vtkhdf-vtkstructuredgrid-support/15920/1 "2025-08-05T12:53:50Z")

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Of all the base vtk data types, the only one remaining without a discussion or a specification is [vtkStructuredGrid](https://vtk.org/doc/nightly/html/classvtkStructuredGrid.html)

While not as important as vtkRectilinearGrid (this is already discussed here [https://gitlab.kitware.com/vtk/vtk/-/issues/19379](https://gitlab.kitware.com/vtk/vtk/-/issues/19379)), is this something VTKHDF users would be happy to use in order to read/write vtkStructuredGrid in VTKHDF format ?

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### Author: ![jpmorr](https://discourse.vtk.org/user_avatar/discourse.vtk.org/jpmorr/32/8944_2.png) [@jpmorr](https://discourse.vtk.org/u/jpmorr)
#### Post date: [August 8, 2025, 8:58am UTC](https://discourse.vtk.org/t/vtkhdf-vtkstructuredgrid-support/15920/2 "2025-08-08T08:58:25Z")

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@mwestphal I believe i posted two possible example files here on the forum a while ago to work towards a specification, based on what a current `vtr`/`vts` file looks like.

You can find the examples here: [Support for RectilinearGrids and StructuredGrids in VTKHDF file format](https://discourse.vtk.org/t/support-for-rectilineargrids-and-structuredgrids-in-vtkhdf-file-format/14283)

Could be a good starting point.

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### Author: ![mwestphal](https://discourse.vtk.org/user_avatar/discourse.vtk.org/mwestphal/32/19_2.png) [@mwestphal](https://discourse.vtk.org/u/mwestphal)
#### Post date: [August 8, 2025, 10:09am UTC](https://discourse.vtk.org/t/vtkhdf-vtkstructuredgrid-support/15920/3 "2025-08-08T10:09:18Z")

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Indeed, I missed that!

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### Author: ![cahash00](https://discourse.vtk.org/user_avatar/discourse.vtk.org/cahash00/32/10295_2.png) [@cahash00](https://discourse.vtk.org/u/cahash00)
#### Post date: [September 22, 2025, 3:29am UTC](https://discourse.vtk.org/t/vtkhdf-vtkstructuredgrid-support/15920/4 "2025-09-22T03:29:40Z")

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Just posting on this issue to see what the status of the Structured grid VTKHDF implementation is? I am working on modernizing a high-fidelity LES CFD code that I would LOVE to be able to use pure HDF5 to write flow visualization files for ParaView. Using the pre-existing formats would result in thousands of files, which is not ideal. HDF5 would be great for this.

What is the progress of this file format? Any updates?

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### Author: ![lgivord](https://discourse.vtk.org/user_avatar/discourse.vtk.org/lgivord/32/3543_2.png) [@lgivord](https://discourse.vtk.org/u/lgivord)
#### Post date: [September 22, 2025, 6:49am UTC](https://discourse.vtk.org/t/vtkhdf-vtkstructuredgrid-support/15920/5 "2025-09-22T06:49:06Z")

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Hi @cahash00,

We converge to a spec in the the linked post here : [VTKHDF vtkStructuredGrid support - #2 by jpmorr](https://discourse.vtk.org/t/vtkhdf-vtkstructuredgrid-support/15920/2) . However I don’t have funding to move forward and implement it in the Spec then in the reader/writer.

if you are interested, see here: [https://discourse.paraview.org/t/how-are-features-and-bug-fixes-incorporated-into-paraview/4735](https://discourse.paraview.org/t/how-are-features-and-bug-fixes-incorporated-into-paraview/4735)