# Segmentation to CFD Mesh
**URL:** https://discourse.slicer.org/t/segmentation-to-cfd-mesh/23693
**Category:** Support
**Tags:** segmentation, vmtk-centerline, meshing
**Created:** [June 3, 2022, 4:32pm UTC](https://discourse.slicer.org/t/segmentation-to-cfd-mesh/23693 "2022-06-03T16:32:20Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Elias\_Karabelas](https://discourse.slicer.org/u/Elias_Karabelas)
#### Post date: [June 3, 2022, 4:32pm UTC](https://discourse.slicer.org/t/segmentation-to-cfd-mesh/23693/1 "2022-06-03T16:32:20Z")
Hey there,
I have a question concerning the transition from segmentation to meshing. I managed to segment some coronary arteries with the aorta and also have the centerline in there (see my slicer screenshot)
In a next step I extracted the surfaces of the segmentation and visualized them in ParaView
So my question regards this extracted surface: I want to do some CFD simulations in the coronaries and the aorta and for generating a suitable mesh I would need to have some sharp boundaries capping of the outlets of coronaries in the aorta and coronaries. Is there any way to achieve this in slicer directly? It was somewhat possible in vmtk as far as I remember (vtmksurfaceclipper cutted normal to the centerline)
Thanks
Elias
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### Author:  [@mau\_igna\_06](https://discourse.slicer.org/u/mau_igna_06)
#### Post date: [June 3, 2022, 5:14pm UTC](https://discourse.slicer.org/t/segmentation-to-cfd-mesh/23693/2 "2022-06-03T17:14:08Z")
If I understand yiur question right you would need to use to use the dynamic modeler plane cut tool with cap option on
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### Author:  [@researchtomliu](https://discourse.slicer.org/u/researchtomliu)
#### Post date: [June 5, 2022, 2:06pm UTC](https://discourse.slicer.org/t/segmentation-to-cfd-mesh/23693/3 "2022-06-05T14:06:46Z")
You might input the stl model to the “Materialise 3-matic 12.0 (x64)” and regenerate the hollow model with you needed.
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### Author:  [@mau\_igna\_06](https://discourse.slicer.org/u/mau_igna_06)
#### Post date: [June 5, 2022, 6:47pm UTC](https://discourse.slicer.org/t/segmentation-to-cfd-mesh/23693/4 "2022-06-05T18:47:45Z")
You can also use hollow tool of Slicer to achieve the same. Use plamar cut without capping option to get your empty on the inside model
Thank you for asking
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### Author:  [@Elias\_Karabelas](https://discourse.slicer.org/u/Elias_Karabelas)
#### Post date: [June 20, 2022, 2:26pm UTC](https://discourse.slicer.org/t/segmentation-to-cfd-mesh/23693/5 "2022-06-20T14:26:31Z")
Hey Mauro, thanks!
So I tried the Dynamic modeller but it is very fuzzy to use it. I have Slicer 4.13 and it seems I cannot make planes with more than one point for spanning a normal, every time I try it adds a new plane. So is there some way to use dynamic modeler and prescribe a point and a normal spanning the plane?
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### Author:  [@mau\_igna\_06](https://discourse.slicer.org/u/mau_igna_06)
#### Post date: [June 20, 2022, 2:44pm UTC](https://discourse.slicer.org/t/segmentation-to-cfd-mesh/23693/6 "2022-06-20T14:44:59Z")
Now that’s the default behavior. You need to go to the markups module and set the plane mode to be 3 points