# Pattern not staying inside surface

**URL:** <https://discourse.mcneel.com/t/pattern-not-staying-inside-surface/218177>\
**Category:** Grasshopper\
**Tags:** windows, pattern\
**Created:** [April 19, 2026, 10:43pm UTC](https://discourse.mcneel.com/t/pattern-not-staying-inside-surface/218177 "2026-04-19T22:43:45Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Hussain1](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/hussain1/32/709783_2.png) [@Hussain1](https://discourse.mcneel.com/u/Hussain1)\
**Post date:** [April 19, 2026, 10:43pm UTC](https://discourse.mcneel.com/t/pattern-not-staying-inside-surface/218177/1 "2026-04-19T22:43:45Z")

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I am trying to create a pattern on a few walls of my part. I created my part in solidworks and brought it into grasshopper.

I used brep and extracted the surfaces that I wanted to create a pattern on.

But when I pattern the surface, the pattern is no not bounded but the edges of my surface

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/2/d/7/2d72a6b2202123116c161ce6631eeacb02ae7081.png)

I am not sure what I am doing wrong.

Once I create the pattern I would extrude the pattern and connect it to the rest of my part.

[organiser\_grasshopper\_pattern.gh](https://discourse.mcneel.com/uploads/short-url/tex3tyUKkpgJZ9NNPwk5ef0JXMo.gh) (90.5 KB)

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**Author:** ![Quan\_Li](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/quan_li/32/679256_2.png) [@Quan\_Li](https://discourse.mcneel.com/u/Quan_Li)\
**Post date:** [April 20, 2026, 1:28am UTC](https://discourse.mcneel.com/t/pattern-not-staying-inside-surface/218177/2 "2026-04-20T01:28:56Z")

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[organiser\_grasshopper\_pattern Edited v0 Timmed vs Untrimmed.gh](https://discourse.mcneel.com/uploads/short-url/2WzK2rGF8dvOK1So3swVHnTqngp.gh) (103.2 KB)

Plugin: Clipper 1  
That Lunchbox component untrims the trimmed surface and then splits it to the panels.

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/2/1/4/21435233b6680ada1e3ad878f52b0072279a1a03.png)  
 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/d/e/8/de81338bb931950537d49d37b957c39b8ca33d4f.jpeg)

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<div class="post-metadata">

**Author:** ![Hussain1](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/hussain1/32/709783_2.png) [@Hussain1](https://discourse.mcneel.com/u/Hussain1)\
**Post date:** [May 30, 2026, 10:12pm UTC](https://discourse.mcneel.com/t/pattern-not-staying-inside-surface/218177/3 "2026-05-30T22:12:25Z")

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I have a question on this,

Will it work if I am trying the same solution on a curved surface.

Thanks!