# Flat inlet/outlet

**URL:** <https://discourse.slicer.org/t/flat-inlet-outlet/38098>\
**Category:** VMTK\
**Created:** [August 28, 2024, 8:42pm UTC](https://discourse.slicer.org/t/flat-inlet-outlet/38098 "2024-08-28T20:42:06Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![iketomomaya](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/iketomomaya/32/77771_2.png) [@iketomomaya](https://discourse.slicer.org/u/iketomomaya)\
**Post date:** [August 28, 2024, 8:42pm UTC](https://discourse.slicer.org/t/flat-inlet-outlet/38098/1 "2024-08-28T20:42:06Z")

</div>

Dear all,

It might be a long shot, but we are facing some issue with VMTK where the inlet/outlet surface is not flat even with flow extensions. For example, even with simple cylinder, we can see that normal vector is not really perpendicular to the inlet/outlet.

Is anyone aware of this issue? or Are there any parameters/commands that can fix this issue? Any advice will be greatly appreciated.

 ![Screenshot 2024-08-28 at 20.56.11](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/c/5c75f5bc193d699aedb89a7562488066a49ddc1c.jpeg)