# How to derive a 2d intersection?

**URL:** <https://discourse.mcneel.com/t/how-to-derive-a-2d-intersection/137857>\
**Category:** Rhino for Windows\
**Tags:** windows, mac\
**Created:** [February 12, 2022, 2:35pm UTC](https://discourse.mcneel.com/t/how-to-derive-a-2d-intersection/137857 "2022-02-12T14:35:02Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![Andrew\_Turner](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/andrew_turner/32/767208_2.png) [@Andrew\_Turner](https://discourse.mcneel.com/u/Andrew_Turner)\
**Post date:** [February 12, 2022, 2:35pm UTC](https://discourse.mcneel.com/t/how-to-derive-a-2d-intersection/137857/1 "2022-02-12T14:35:02Z")

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I’d like to be able to use a plane, object, or some operation to be able to derive a 2d intersection, but can’t seem to find a way to do this. In the example below, I’m trying to get the shape shown as the single polyline:

 ![Screen Shot 2022-02-12 at 9.31.56 AM](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/e/2/8/e28018f60b95d91965fbc0247cc9f8d8e08b2dd8.jpeg)

If I try using a plane to cut through the extruded perimeter, I get a solid surface…

FYI, sometimes it will be on an angle, so using the profile that was extruded into the “walls” won’t work.

What are some ways to do this?

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**Author:** ![Holo](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/holo/32/496872_2.png) [@Holo](https://discourse.mcneel.com/u/Holo)\
**Post date:** [February 12, 2022, 2:37pm UTC](https://discourse.mcneel.com/t/how-to-derive-a-2d-intersection/137857/2 "2022-02-12T14:37:05Z")

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Have you tried to Project a curve from frontview?  
Or make a plane and intersect.

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**Author:** ![Andrew\_Turner](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/andrew_turner/32/767208_2.png) [@Andrew\_Turner](https://discourse.mcneel.com/u/Andrew_Turner)\
**Post date:** [February 12, 2022, 2:58pm UTC](https://discourse.mcneel.com/t/how-to-derive-a-2d-intersection/137857/3 "2022-02-12T14:58:38Z")

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Yeah, thanks - just found out there is an “intersect” command… thanks!

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**Author:** ![Gijs](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/gijs/32/481553_2.png) [@Gijs](https://discourse.mcneel.com/u/Gijs)\
**Post date:** [February 12, 2022, 3:07pm UTC](https://discourse.mcneel.com/t/how-to-derive-a-2d-intersection/137857/4 "2022-02-12T15:07:09Z")

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Additionally, there is \_Section

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<div class="post-metadata">

**Author:** ![Andrew\_Turner](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/andrew_turner/32/767208_2.png) [@Andrew\_Turner](https://discourse.mcneel.com/u/Andrew_Turner)\
**Post date:** [February 14, 2022, 6:04pm UTC](https://discourse.mcneel.com/t/how-to-derive-a-2d-intersection/137857/5 "2022-02-14T18:04:44Z")

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This is great. Thanks.

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**Author:** ![markintheozarks](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/markintheozarks/32/678563_2.png) [@markintheozarks](https://discourse.mcneel.com/u/markintheozarks)\
**Post date:** [February 14, 2022, 6:18pm UTC](https://discourse.mcneel.com/t/how-to-derive-a-2d-intersection/137857/6 "2022-02-14T18:18:20Z")

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And there is Contour.—-Mark

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<div class="post-metadata">

**Author:** ![Andrew\_Turner](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/andrew_turner/32/767208_2.png) [@Andrew\_Turner](https://discourse.mcneel.com/u/Andrew_Turner)\
**Post date:** [February 14, 2022, 6:19pm UTC](https://discourse.mcneel.com/t/how-to-derive-a-2d-intersection/137857/7 "2022-02-14T18:19:59Z")

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Lol! I’ll take a look. Sounds familiar but I don’t remember ever using it.

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**Author:** ![eddi](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/eddi/32/514714_2.png) [@eddi](https://discourse.mcneel.com/u/eddi)\
**Post date:** [February 14, 2022, 6:43pm UTC](https://discourse.mcneel.com/t/how-to-derive-a-2d-intersection/137857/8 "2022-02-14T18:43:14Z")

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Hi,  
And this is a bit more complex

> **[SectionTools for Rhino 7 - New Release](http://blog.rhino3d.com/2021/04/sectiontools-for-rhino7-new-release.html)**
>
>   A new version of the SectionTools plugin for Rhino 7 for Windows is now available.  You can install using the PackageManager command in Rh...