# Joined Breps in GH are separate surfaces again after baking into Rhino

**URL:** <https://discourse.mcneel.com/t/joined-breps-in-gh-are-separate-surfaces-again-after-baking-into-rhino/131164>\
**Category:** Grasshopper\
**Created:** [October 4, 2021, 1:49pm UTC](https://discourse.mcneel.com/t/joined-breps-in-gh-are-separate-surfaces-again-after-baking-into-rhino/131164 "2021-10-04T13:49:46Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![kai.ebert](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/kai.ebert/32/329830_2.png) [@kai.ebert](https://discourse.mcneel.com/u/kai.ebert)\
**Post date:** [October 4, 2021, 1:49pm UTC](https://discourse.mcneel.com/t/joined-breps-in-gh-are-separate-surfaces-again-after-baking-into-rhino/131164/1 "2021-10-04T13:49:46Z")

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Hi,

I have some small issue, which i try now for a while to solve.  
When i join my geometries together with “Join Breps” and then baking the same into Rhino, all surfaces are separated again and can be selected separately.  
I can then select the whole parts and Join them in Rhino, but thats difficult and time consuming task, so i would like these parts baked as one open polysurface.

I would need the joined Breps baked into Rhino as “one open Polysurface”.

Any idea on how this is properly done via GH?

Thanks in advance for any guidance.

KE

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**Author:** ![martinsiegrist](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/martinsiegrist/32/498369_2.png) [@martinsiegrist](https://discourse.mcneel.com/u/martinsiegrist)\
**Post date:** [October 4, 2021, 1:54pm UTC](https://discourse.mcneel.com/t/joined-breps-in-gh-are-separate-surfaces-again-after-baking-into-rhino/131164/2 "2021-10-04T13:54:30Z")

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Sounds like you need to flatten the input on the join brep component.

If that doesn’t solve the problem, post a file.

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**Author:** ![kai.ebert](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/kai.ebert/32/329830_2.png) [@kai.ebert](https://discourse.mcneel.com/u/kai.ebert)\
**Post date:** [October 4, 2021, 1:55pm UTC](https://discourse.mcneel.com/t/joined-breps-in-gh-are-separate-surfaces-again-after-baking-into-rhino/131164/3 "2021-10-04T13:55:10Z")

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@martinsiegrist  
Hi,

ok, will try that.

Thanks,  
KE

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<div class="post-metadata">

**Author:** ![kai.ebert](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/kai.ebert/32/329830_2.png) [@kai.ebert](https://discourse.mcneel.com/u/kai.ebert)\
**Post date:** [October 4, 2021, 2:01pm UTC](https://discourse.mcneel.com/t/joined-breps-in-gh-are-separate-surfaces-again-after-baking-into-rhino/131164/4 "2021-10-04T14:01:19Z")

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@martinsiegrist  
Hi Martin,

thanks for the hint, i had actually on the wrong position flattened and not at the actual “join Breps” component.

Thanks a lot.

Cheers,  
KE