# Can't split mesh

**URL:** <https://discourse.mcneel.com/t/cant-split-mesh/63448>\
**Category:** Grasshopper\
**Created:** [May 22, 2018, 7:27pm UTC](https://discourse.mcneel.com/t/cant-split-mesh/63448 "2018-05-22T19:27:49Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![zoster](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/zoster/32/633303_2.png) [@zoster](https://discourse.mcneel.com/u/zoster)\
**Post date:** [May 22, 2018, 7:27pm UTC](https://discourse.mcneel.com/t/cant-split-mesh/63448/1 "2018-05-22T19:27:49Z")

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i tried mesh split and mesh split plane, both give odd results (geometry seems ok).  
i attached the def if anyone is willing to take a look…  
thanks for your interest!

 ![image](https://global.discourse-cdn.com/mcneel/original/3X/8/c/8c6906062a1d3bee20f2e6740022aeb24cc696b9.png)

[mesh split problem.gh](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/f/9/f9fd7311119006e65b32a894567285e5330079a8.gh) (22.2 KB)

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**Author:** ![HS\_Kim](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/hs_kim/32/473975_2.png) [@HS\_Kim](https://discourse.mcneel.com/u/HS_Kim)\
**Post date:** [May 22, 2018, 8:10pm UTC](https://discourse.mcneel.com/t/cant-split-mesh/63448/2 "2018-05-22T20:10:19Z")

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I’m afraid your mesh is not a good one thought..

There are 1,800 duplicated faces in your bad mesh.

Here is a solution but I have no idea how the **`Mesh Split Plane`** would identify the above and bellow plane in this case.

You’ll need Meshedit plugin.

> **[MeshEdit](https://www.food4rhino.com/en/app/meshedit)**
>
> Meshedit is a set of components which extend Grasshopper's ability to work with meshes. included components: utilities:

 ![capture-20180523-044802](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/c/f/cf5ee30946ce589b4bb5f6169418bcbc3573aa2d.png) ![Canvas%20at%2005%3B04%3B53](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/0/1/010dd186c1a6d238af907b667dd617103a523796.png)  
[mesh split problem\_re.gh](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/2/b/2b2017e60079f3929647a4194112a5c5f74bab57.gh) (14.9 KB)

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<div class="post-metadata">

**Author:** ![zoster](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/zoster/32/633303_2.png) [@zoster](https://discourse.mcneel.com/u/zoster)\
**Post date:** [May 22, 2018, 8:39pm UTC](https://discourse.mcneel.com/t/cant-split-mesh/63448/3 "2018-05-22T20:39:47Z")

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Thanks for pointing that out! I ll get to the root of it.

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**Author:** ![zoster](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/zoster/32/633303_2.png) [@zoster](https://discourse.mcneel.com/u/zoster)\
**Post date:** [May 25, 2018, 7:33pm UTC](https://discourse.mcneel.com/t/cant-split-mesh/63448/4 "2018-05-25T19:33:01Z")

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it’s so weird, it gives the proper result if I generate a mesh based on the bad one like you did in the definition you sent (thank you by the way!), but it doesn’t work if i generate a simple flt mesh or if i make it curved but without the doubling. i attached the file if you still want to take a look…[mesh split problem\_2.gh](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/5/d/5d14c244ef5802b86c0c70f498ccd5f0eb523823.gh) (32.0 KB)