# After Smoothing and hole filling Still some holes arte there in 3 D model of nasal cavity

**URL:** <https://discourse.slicer.org/t/after-smoothing-and-hole-filling-still-some-holes-arte-there-in-3-d-model-of-nasal-cavity/20546>\
**Category:** Support\
**Tags:** segmentation, dicom\
**Created:** [November 9, 2021, 3:21pm UTC](https://discourse.slicer.org/t/after-smoothing-and-hole-filling-still-some-holes-arte-there-in-3-d-model-of-nasal-cavity/20546 "2021-11-09T15:21:17Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![Sliceeeeee](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sliceeeeee/32/12358_2.png) [@Sliceeeeee](https://discourse.slicer.org/u/Sliceeeeee)\
**Post date:** [November 9, 2021, 3:21pm UTC](https://discourse.slicer.org/t/after-smoothing-and-hole-filling-still-some-holes-arte-there-in-3-d-model-of-nasal-cavity/20546/1 "2021-11-09T15:21:17Z")

</div>

I am going to do nasal airflow simulation , i am made a 3D model of nasal cavity in 3D slicer , but still there are many holes what to do ? and also after making 3D model is there any other post processing required before exporting it to any simulation software ?

Thanks

---

<div class="post-metadata">

**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [November 9, 2021, 4:08pm UTC](https://discourse.slicer.org/t/after-smoothing-and-hole-filling-still-some-holes-arte-there-in-3-d-model-of-nasal-cavity/20546/2 "2021-11-09T16:08:34Z")

</div>

> [@Sliceeeeee](#):
>
> i am made a 3D model of nasal cavity in 3D slicer , but still there are many holes what to do ?

There are many different approaches to decide what are considered holes and how to fill them. Could you post a few images that illustrate what kind of shapes, level of details, and size and number of holes you encounter?

> [@Sliceeeeee](#):
>
> after making 3D model is there any other post processing required before exporting it to any simulation software ?

If your simulation software can create volumetric mesh from surface mesh (ply, vtk, vtp, or obj file) then probably no post-processing is necessary. If your simulation software expects a volumetric mesh (e.g., tetrahedral mesh) then you can use SegmentMesher extension to generate it from the segmentation.

---

<div class="post-metadata">

**Author:** ![Sliceeeeee](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sliceeeeee/32/12358_2.png) [@Sliceeeeee](https://discourse.slicer.org/u/Sliceeeeee)\
**Post date:** [November 9, 2021, 6:01pm UTC](https://discourse.slicer.org/t/after-smoothing-and-hole-filling-still-some-holes-arte-there-in-3-d-model-of-nasal-cavity/20546/3 "2021-11-09T18:01:53Z")

</div>

![20211109_221832](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/8/4/84886b6aa309de83b2945c8be568ac098cab204d.jpeg)

 ![20211109_221756](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/7/b79cee0b51e55fd984e10bc493ab852adbb49d62.jpeg)

These types of holes are there …

---

<div class="post-metadata">

**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [November 9, 2021, 6:16pm UTC](https://discourse.slicer.org/t/after-smoothing-and-hole-filling-still-some-holes-arte-there-in-3-d-model-of-nasal-cavity/20546/4 "2021-11-09T18:16:58Z")

</div>

For me it is very hard to interpret these screenshots. Could you maybe show a few slice views and use an arrow to point out the issue instead of circling a large area?

---

<div class="post-metadata">

**Author:** ![Sliceeeeee](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sliceeeeee/32/12358_2.png) [@Sliceeeeee](https://discourse.slicer.org/u/Sliceeeeee)\
**Post date:** [November 9, 2021, 7:20pm UTC](https://discourse.slicer.org/t/after-smoothing-and-hole-filling-still-some-holes-arte-there-in-3-d-model-of-nasal-cavity/20546/5 "2021-11-09T19:20:59Z")

</div>

![20211109_221836](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/0/b0c2446664abcf52307d80ebe7f16a133a3a6a06.jpeg)  
Please Check This one , while doing smoothing for higher size hole other anatomy also merged (which should not be actually)

Thanks

---

<div class="post-metadata">

**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [November 9, 2021, 8:03pm UTC](https://discourse.slicer.org/t/after-smoothing-and-hole-filling-still-some-holes-arte-there-in-3-d-model-of-nasal-cavity/20546/6 "2021-11-09T20:03:00Z")

</div>

If the holes only appear where the surface is very thin then it may be due to surface smoothing (that is applied when the binary labelmap representation is converted to a closed surface representation). You can address this by increasing the resolution (reducing the spacing of the segmentation) or reduce the smoothing factor.