# Create perimeter around curves

**URL:** <https://forum.dynamobim.com/t/create-perimeter-around-curves/23782>\
**Category:** Geometry\
**Created:** [July 16, 2018, 3:22pm UTC](https://forum.dynamobim.com/t/create-perimeter-around-curves/23782 "2018-07-16T15:22:43Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![magnus](https://avatars.discourse-cdn.com/v4/letter/m/e9c0ed/32.png) [@magnus](https://forum.dynamobim.com/u/magnus)\
**Post date:** [July 16, 2018, 3:22pm UTC](https://forum.dynamobim.com/t/create-perimeter-around-curves/23782/1 "2018-07-16T15:22:43Z")

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Hello all  
I want to create a perimeter from a set of curves. It should take the shortest route possible.  
I think my goal is best illustrated with pictures:  
How it currently looks:

 ![current%20view](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/b/9/b958319ad8763c09c67ceb93a67023d0d1c6cddb.PNG)  
What i want (behold my skills in Paint):  
 ![Circumference](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/4/c/4c2fda9adac35d3bf5bb7017013dd4f9d8947e6e.PNG)

What I am interested in is how you would approach this problem? and if there are some nodes that i should look into?  
Thanks!

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**Author:** ![Michael\_Kirschner2](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/michael_kirschner2/32/75576_2.png) [@Michael\_Kirschner2](https://forum.dynamobim.com/u/Michael_Kirschner2)\
**Post date:** [July 16, 2018, 3:59pm UTC](https://forum.dynamobim.com/t/create-perimeter-around-curves/23782/2 "2018-07-16T15:59:27Z")

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you want to calculate something like a convex hull I guess.

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**Author:** ![magnus](https://avatars.discourse-cdn.com/v4/letter/m/e9c0ed/32.png) [@magnus](https://forum.dynamobim.com/u/magnus)\
**Post date:** [July 16, 2018, 6:11pm UTC](https://forum.dynamobim.com/t/create-perimeter-around-curves/23782/3 "2018-07-16T18:11:48Z")

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Thanks! That’s it

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**Author:** ![vanman](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/vanman/32/20881_2.png) [@vanman](https://forum.dynamobim.com/u/vanman)\
**Post date:** [August 21, 2020, 12:53am UTC](https://forum.dynamobim.com/t/create-perimeter-around-curves/23782/4 "2020-08-21T00:53:40Z")

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what about if you wanted this perimeter?

![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/a/1/a1d17006693853659db6c74c2de01c0cd7a08f30.png)

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**Author:** ![filip.kabelis](https://avatars.discourse-cdn.com/v4/letter/f/dc4da7/32.png) [@filip.kabelis](https://forum.dynamobim.com/u/filip.kabelis)\
**Post date:** [August 21, 2020, 4:23pm UTC](https://forum.dynamobim.com/t/create-perimeter-around-curves/23782/5 "2020-08-21T16:23:14Z")

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I would extrude them all, join solids and then got top surface of that solid, then would get curves of that surface, et voila:)