# Fill in part of segment without adding whole model 

**URL:** <https://discourse.slicer.org/t/fill-in-part-of-segment-without-adding-whole-model/47045>\
**Category:** Support\
**Tags:** segmentation, masking\
**Created:** [May 15, 2026, 2:26pm UTC](https://discourse.slicer.org/t/fill-in-part-of-segment-without-adding-whole-model/47045 "2026-05-15T14:26:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![akelly17](https://avatars.discourse-cdn.com/v4/letter/a/439d5e/32.png) [@akelly17](https://discourse.slicer.org/u/akelly17)\
**Post date:** [May 15, 2026, 2:26pm UTC](https://discourse.slicer.org/t/fill-in-part-of-segment-without-adding-whole-model/47045/1 "2026-05-15T14:26:19Z")

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Hey all, I cannot seem to figure out how to get this section of my model to fill in (i.e: make the segment whole) without adding back the entire model. I have just figured out how the “masking” function works, and am still confused about the inter-workings of it all. Any and all help is appreciated, especially if you’re willing to dumb it down for me haha

 ![IMG_4204](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/0/006d6e9f61ec1b47081a8e8b086a55e458c52909.jpeg)

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**Author:** ![ThomasVanParys](https://avatars.discourse-cdn.com/v4/letter/t/7ea924/32.png) [@ThomasVanParys](https://discourse.slicer.org/u/ThomasVanParys)\
**Post date:** [May 15, 2026, 3:38pm UTC](https://discourse.slicer.org/t/fill-in-part-of-segment-without-adding-whole-model/47045/2 "2026-05-15T15:38:59Z")

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If you are working directly on a surface mesh, you can use the `SurfaceToolbox` module, and navigate to the Fill Holes function…

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/2/c/2c95a59725d7177d67406cec3cb7bfcaaf4373c8.png)