# How to construct dataset with topology missing?

**URL:** https://discourse.vtk.org/t/how-to-construct-dataset-with-topology-missing/14216
**Category:** Development
**Created:** [July 12, 2024, 10:06am UTC](https://discourse.vtk.org/t/how-to-construct-dataset-with-topology-missing/14216 "2024-07-12T10:06:34Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Northern\_Condor1](https://discourse.vtk.org/user_avatar/discourse.vtk.org/northern_condor1/32/9062_2.png) [@Northern\_Condor1](https://discourse.vtk.org/u/Northern_Condor1)
#### Post date: [July 12, 2024, 10:06am UTC](https://discourse.vtk.org/t/how-to-construct-dataset-with-topology-missing/14216/1 "2024-07-12T10:06:34Z")

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Hi!

Could you please clarify, how to construct a dataset of tetrahedrons if I have only a list of coordinates, and the topology is missing?

Best Regards.  
Mike

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### Author: ![will.schroeder](https://discourse.vtk.org/user_avatar/discourse.vtk.org/will.schroeder/32/233_2.png) [@will.schroeder](https://discourse.vtk.org/u/will.schroeder)
#### Post date: [July 12, 2024, 10:13am UTC](https://discourse.vtk.org/t/how-to-construct-dataset-with-topology-missing/14216/2 "2024-07-12T10:13:17Z")

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If this is the case, then you have to build the topology with a filter like vtkDelaunay3D, or sample the data onto a structured grid (i.e., volume).

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### Author: ![Northern\_Condor1](https://discourse.vtk.org/user_avatar/discourse.vtk.org/northern_condor1/32/9062_2.png) [@Northern\_Condor1](https://discourse.vtk.org/u/Northern_Condor1)
#### Post date: [July 12, 2024, 11:19am UTC](https://discourse.vtk.org/t/how-to-construct-dataset-with-topology-missing/14216/3 "2024-07-12T11:19:03Z")

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> [@will.schroeder](#):
>
> vtkDelaunay3D

Merci a lot