# Cut 3d surface from the whole with accuracy

**URL:** <https://discourse.slicer.org/t/cut-3d-surface-from-the-whole-with-accuracy/8432>\
**Category:** Support\
**Created:** [September 14, 2019, 11:45pm UTC](https://discourse.slicer.org/t/cut-3d-surface-from-the-whole-with-accuracy/8432 "2019-09-14T23:45:42Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Amine](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/amine/32/4844_2.png) [@Amine](https://discourse.slicer.org/u/Amine)\
**Post date:** [September 15, 2019, 1:30am UTC](https://discourse.slicer.org/t/cut-3d-surface-from-the-whole-with-accuracy/8432/2 "2019-09-15T01:30:34Z")

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I don’t think you will have good results working directly on the segment, rather use it as a mask to execute grow from seeds as in the method explained here [Suggestion: Quicker scissor tool and Seed growing to split a segment in two parts](https://discourse.slicer.org/t/suggestion-quicker-scissor-tool-and-seed-growing-to-split-a-segment-in-two-parts/6006/2)  
You basically need to

1. draw boundaries outside that segment ( to increase growfromseeds range (let’s call it GFS) )
2. use masking options editable = inside that segment then draw the seeds in two separate new segments,
3. then hide the original segment (so GFS does not see it as a seed) and execute GFS with editable = inside the hidden segment (GFS will then use it as a frame).

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