# Creating a 3D Letter, Curves are not closed, where is my error?

**URL:** <https://forum.dynamobim.com/t/creating-a-3d-letter-curves-are-not-closed-where-is-my-error/57513>\
**Category:** Geometry\
**Created:** [November 20, 2020, 2:54pm UTC](https://forum.dynamobim.com/t/creating-a-3d-letter-curves-are-not-closed-where-is-my-error/57513 "2020-11-20T14:54:53Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Draxl\_Andreas](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/draxl_andreas/32/145744_2.png) [@Draxl\_Andreas](https://forum.dynamobim.com/u/Draxl_Andreas)\
**Post date:** [November 20, 2020, 2:54pm UTC](https://forum.dynamobim.com/t/creating-a-3d-letter-curves-are-not-closed-where-is-my-error/57513/1 "2020-11-20T14:54:53Z")

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Hello,

I have anywhere some trouble, i can`t close the loop. how can i create a polycurve?  
Where is the missing node or even a geometry-error?

 ![2020-11-20_15h49_21](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/e/6/e603c061621f8d74d53dd3042590580676c6b4e3.png) ![2020-11-20_15h49_43](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/6/d/6d1a9964e852a3f54332a2e354601f255e4e0c6e.png)  
[END.dyn](https://forum.dynamobim.com/uploads/short-url/7mGpqHAeBWCY3myEw0lUlHdCdnM.dyn) (204.7 KB)  
KR  
Andreas

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**Author:** ![Marcel\_Rijsmus](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/marcel_rijsmus/32/8539_2.png) [@Marcel\_Rijsmus](https://forum.dynamobim.com/u/Marcel_Rijsmus)\
**Post date:** [November 20, 2020, 4:04pm UTC](https://forum.dynamobim.com/t/creating-a-3d-letter-curves-are-not-closed-where-is-my-error/57513/2 "2020-11-20T16:04:08Z")

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Hello @Draxl_Andreas  
Have you tried **PolyCurve.ByJoinedCurves**?

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**Author:** ![Draxl\_Andreas](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/draxl_andreas/32/145744_2.png) [@Draxl\_Andreas](https://forum.dynamobim.com/u/Draxl_Andreas)\
**Post date:** [November 23, 2020, 1:07pm UTC](https://forum.dynamobim.com/t/creating-a-3d-letter-curves-are-not-closed-where-is-my-error/57513/3 "2020-11-23T13:07:29Z")

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hmmmm…

 ![2020-11-23_14h06_43](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/e/d/edb2954d51c504de272c670771efc33fc849d462.png)  
I think i have no overlapping lines or even dublicated  
Can i say something like “unique Items”…?

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**Author:** ![Nick\_Boyts](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/nick_boyts/32/76313_2.png) [@Nick\_Boyts](https://forum.dynamobim.com/u/Nick_Boyts)\
**Post date:** [November 24, 2020, 10:00pm UTC](https://forum.dynamobim.com/t/creating-a-3d-letter-curves-are-not-closed-where-is-my-error/57513/4 "2020-11-24T22:00:16Z")

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I believe your individual curves need to be in order. If they cross or form multiple closed loops the node will fail.

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**Author:** ![Draxl\_Andreas](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/draxl_andreas/32/145744_2.png) [@Draxl\_Andreas](https://forum.dynamobim.com/u/Draxl_Andreas)\
**Post date:** [November 25, 2020, 5:42pm UTC](https://forum.dynamobim.com/t/creating-a-3d-letter-curves-are-not-closed-where-is-my-error/57513/5 "2020-11-25T17:42:43Z")

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![2020-11-25_18h41_26](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/5/a/5a89b39233b5476f65e34e53aa36618275a49767.png)  
 ![2020-11-25_18h44_57](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/d/7/d7d2b24b4df9ae06837d4aafccf31b7a03f97620.jpeg)  
I tried it with a simpler form. So it creates the surface but not the extrusion 😕  
is it list - deepth problem, how can i create the extrusion?

KR Andreas

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<div class="post-metadata">

**Author:** ![Nick\_Boyts](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/nick_boyts/32/76313_2.png) [@Nick\_Boyts](https://forum.dynamobim.com/u/Nick_Boyts)\
**Post date:** [November 25, 2020, 6:04pm UTC](https://forum.dynamobim.com/t/creating-a-3d-letter-curves-are-not-closed-where-is-my-error/57513/6 "2020-11-25T18:04:23Z")

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GroupByKey is for grouping items in a list. It’s not going to do what you want and you’re providing a single item anyway. You’re getting errors because you’re trying to pull index 1 from a list that only has one item. You seem to already have the PolyCurve so you should be able to patch and extrude that as is.

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**Author:** ![Draxl\_Andreas](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/draxl_andreas/32/145744_2.png) [@Draxl\_Andreas](https://forum.dynamobim.com/u/Draxl_Andreas)\
**Post date:** [November 25, 2020, 6:10pm UTC](https://forum.dynamobim.com/t/creating-a-3d-letter-curves-are-not-closed-where-is-my-error/57513/7 "2020-11-25T18:10:09Z")

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![2020-11-25_19h08_40](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/7/a/7a5e0ba5eaf4162fb8a7246a93d9750a276df659.png) ![2020-11-25_19h09_09](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/8/0/802481964f17f51686e6bcd5b428c2cdf9a9f159.png)  
hmmm… or need i just one polycurve \> surface \> extrusion  
?  
 ![2020-11-25_19h11_17](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/c/9/c98e1b84fc631cdc0094b88f9facd07a4a257a3e.jpeg)  
I got it!