# Fill or extract cavities in segmentations using the new "Wrap Solidify" effect

**URL:** <https://discourse.slicer.org/t/fill-or-extract-cavities-in-segmentations-using-the-new-wrap-solidify-effect/11248>\
**Category:** Support\
**Tags:** feature, segmentation\
**Created:** [April 22, 2020, 11:28am UTC](https://discourse.slicer.org/t/fill-or-extract-cavities-in-segmentations-using-the-new-wrap-solidify-effect/11248 "2020-04-22T11:28:04Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [April 22, 2020, 10:25am UTC](https://discourse.slicer.org/t/fill-or-extract-cavities-in-segmentations-using-the-new-wrap-solidify-effect/11248/2 "2020-04-22T10:25:57Z")

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I just saw the [youtube video about the Wrap Solidify effect](https://www.youtube.com/watch?v=IWo-QlU4J_c), very nice work!

I’d like to ask about its potential usage to fill smaller holes. Looking at this [screenshot](https://github.com/sebastianandress/Slicer-SurfaceWrapSolidify/blob/master/Resources/Screenshots/screenshot4.png), I can see that there is a Custom region mode, which allows selecting one of the segments. Could this be used to segment smaller cavities such as the soft bone area in the mandible, like in this screenshot below?  
Thank you!

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/e/2/e2446bf5781ad82c09a3627abda2e172309fd851.jpeg)

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