# Selecting surface

**URL:** <https://discourse.mcneel.com/t/selecting-surface/79578>\
**Category:** Grasshopper\
**Created:** [March 2, 2019, 5:01pm UTC](https://discourse.mcneel.com/t/selecting-surface/79578 "2019-03-02T17:01:24Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![a.slusarek1](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/a.slusarek1/32/135297_2.png) [@a.slusarek1](https://discourse.mcneel.com/u/a.slusarek1)\
**Post date:** [March 2, 2019, 5:01pm UTC](https://discourse.mcneel.com/t/selecting-surface/79578/1 "2019-03-02T17:01:24Z")

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Hi all,

I am relatively new to Grasshopper and cannot figure out something what seems to be so easy.  
I have 5 non planar curves and I am trying to make them to intersect to give me a surface.  
I couldn’t create a surface through boundary surface and found out that my curves are non planar so needed to use a different method.  
I have manages to create 5 surfaces but they don’t want to intersect. I have also tried to intersect curves to give me a required shape to create a surface after but no luck (image

 ![iMAGE%203](https://global.discourse-cdn.com/mcneel/original/3X/8/7/878ae3597ee5bbfe5babbda799f86085cf905390.png)  
I am attaching images what I am trying to achieve (I didn’t manage, I had to draw around the shape to get the surface I needed).[Curves\_surface\_intersection.3dm](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/b/4/b441d9e0946f2f335bf39f748ae505091bc9d65d.3dm) (45.1 KB)  
[curves\_surface\_subtraction.gh](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/2/f/2f2108ac89fc04b9dad839c868b5413c77058b73.gh) (12.9 KB)  
 ![Image%201](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/2/c/2cc9b7db7a27289bd68235698dffd369046463af.png) ![iMAGE%202](https://global.discourse-cdn.com/mcneel/original/3X/7/0/7036b32e40868c0a55189b8d86d6323acd1edcaa.png)