# Cut rectangle section

**URL:** <https://discourse.mcneel.com/t/cut-rectangle-section/127477>\
**Category:** Grasshopper\
**Created:** [July 15, 2021, 10:59am UTC](https://discourse.mcneel.com/t/cut-rectangle-section/127477 "2021-07-15T10:59:58Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![eghbalpourf](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/eghbalpourf/32/258234_2.png) [@eghbalpourf](https://discourse.mcneel.com/u/eghbalpourf)\
**Post date:** [July 15, 2021, 10:59am UTC](https://discourse.mcneel.com/t/cut-rectangle-section/127477/1 "2021-07-15T10:59:58Z")

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Hello friends  
How can I clear that part of the rectangle section that is in the cylinders?  
[sandboxtopology.gha](https://discourse.mcneel.com/uploads/short-url/qIObiYSQ9vKGX7eLztwgDgmihaR.gha) (59 KB)  
[cover-v2.gh](https://discourse.mcneel.com/uploads/short-url/aZg5Ib55X6nIiGjLgCh27xIdIbg.gh) (127.5 KB)

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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:** [July 15, 2021, 11:14am UTC](https://discourse.mcneel.com/t/cut-rectangle-section/127477/2 "2021-07-15T11:14:14Z")

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Like this?

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/0/9/6/0963bd3a321abc676dae8cb15a09031163cf1628.png)

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<div class="post-metadata">

**Author:** ![eghbalpourf](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/eghbalpourf/32/258234_2.png) [@eghbalpourf](https://discourse.mcneel.com/u/eghbalpourf)\
**Post date:** [July 15, 2021, 11:38am UTC](https://discourse.mcneel.com/t/cut-rectangle-section/127477/3 "2021-07-15T11:38:59Z")

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hi @martinsiegrist  
yes

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<div class="post-metadata">

**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:** [July 15, 2021, 12:08pm UTC](https://discourse.mcneel.com/t/cut-rectangle-section/127477/4 "2021-07-15T12:08:30Z")

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Not sure about the radius so I just used a value bigger than the intersection at the nodes to illustrate the situation.

You can run a Solid Difference with the B input flattened. Not the most efficient solution but it gets the job done.

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/a/f/9/af97120c331c21cc4271d72f46d34a34f8a6a273.jpeg)

[cover-v2.gh](https://discourse.mcneel.com/uploads/short-url/6M7vumfrgtpYLzOX12LQneGF1Fh.gh) (133.4 KB)

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<div class="post-metadata">

**Author:** ![eghbalpourf](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/eghbalpourf/32/258234_2.png) [@eghbalpourf](https://discourse.mcneel.com/u/eghbalpourf)\
**Post date:** [July 15, 2021, 4:02pm UTC](https://discourse.mcneel.com/t/cut-rectangle-section/127477/5 "2021-07-15T16:02:23Z")

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Thank @martinsiegrist  
I do not know why component 79 and 82 turn red.

[cover-v2.gh](https://discourse.mcneel.com/uploads/short-url/h5rAD62clsesG3hOZv8WlxGyLbZ.gh) (460.2 KB)

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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:** [July 15, 2021, 4:28pm UTC](https://discourse.mcneel.com/t/cut-rectangle-section/127477/6 "2021-07-15T16:28:57Z")

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What’s your goal when you’re projecting the closed brep onto the plane?

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/f/9/2/f923cbdd50ff5e2ea78b662ca3fe3033ac31a545.png)

BTW you can create the planes much easier… with an Evaluate Surface component…

[cover-v2.gh](https://discourse.mcneel.com/uploads/short-url/jUw8V8kAifN91eDwIYMRMspFG3Y.gh) (447.3 KB)

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<div class="post-metadata">

**Author:** ![eghbalpourf](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/eghbalpourf/32/258234_2.png) [@eghbalpourf](https://discourse.mcneel.com/u/eghbalpourf)\
**Post date:** [July 15, 2021, 5:06pm UTC](https://discourse.mcneel.com/t/cut-rectangle-section/127477/7 "2021-07-15T17:06:11Z")

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I wanted to cut the cylinders using these plates

 ![2021-07-15_21-35-34](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/1/6/d/16d64bfd090f377a83157536bc26894970519625.jpeg)