# How to write STL from x y z co-ordinates ?
**URL:** https://discourse.vtk.org/t/how-to-write-stl-from-x-y-z-co-ordinates/711
**Category:** Development
**Tags:** file-formats
**Created:** [April 9, 2019, 5:07am UTC](https://discourse.vtk.org/t/how-to-write-stl-from-x-y-z-co-ordinates/711 "2019-04-09T05:07:32Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@selvakarna](https://discourse.vtk.org/u/selvakarna)
#### Post date: [April 9, 2019, 5:07am UTC](https://discourse.vtk.org/t/how-to-write-stl-from-x-y-z-co-ordinates/711/1 "2019-04-09T05:07:32Z")
How to write STL from x y z co-ordinates? x y z are extracted from 3D volume images, so my goal is x y z convert to STL?
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### Author:  [@cory.quammen](https://discourse.vtk.org/u/cory.quammen)
#### Post date: [April 9, 2019, 12:47pm UTC](https://discourse.vtk.org/t/how-to-write-stl-from-x-y-z-co-ordinates/711/2 "2019-04-09T12:47:45Z")
STL is a surface geometry format, so you will need to extract a surface from the 3D volume images first.
Relevant examples:
**Extracting an isocontour from a structured points** (it will work with a 3D image volume as well)
[https://lorensen.github.io/VTKExamples/site/Cxx/VisualizationAlgorithms/IronIsoSurface/](https://lorensen.github.io/VTKExamples/site/Cxx/VisualizationAlgorithms/IronIsoSurface/)
**Saving an STL**
[https://lorensen.github.io/VTKExamples/site/Python/IO/WriteSTL/](https://lorensen.github.io/VTKExamples/site/Python/IO/WriteSTL/)
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### Author:  [@selvakarna](https://discourse.vtk.org/u/selvakarna)
#### Post date: [April 9, 2019, 2:22pm UTC](https://discourse.vtk.org/t/how-to-write-stl-from-x-y-z-co-ordinates/711/3 "2019-04-09T14:22:57Z")
Thank you sir, i will check and update you.
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### Author:  [@selvakarna](https://discourse.vtk.org/u/selvakarna)
#### Post date: [April 9, 2019, 2:27pm UTC](https://discourse.vtk.org/t/how-to-write-stl-from-x-y-z-co-ordinates/711/4 "2019-04-09T14:27:15Z")
Sir i have generated Triangulation from X Y Z , but i cont generate 3D STL shape? can you share sample code?