# How to delete Duplicate curves?

**URL:** <https://discourse.mcneel.com/t/how-to-delete-duplicate-curves/8418>\
**Category:** Rhino for Windows\
**Created:** [May 15, 2014, 6:06pm UTC](https://discourse.mcneel.com/t/how-to-delete-duplicate-curves/8418 "2014-05-15T18:06:19Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![Joe\_Cook](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/joe_cook/32/6185_2.png) [@Joe\_Cook](https://discourse.mcneel.com/u/Joe_Cook)\
**Post date:** [May 15, 2014, 6:06pm UTC](https://discourse.mcneel.com/t/how-to-delete-duplicate-curves/8418/1 "2014-05-15T18:06:19Z")

</div>

Hi all im having trouble deleting duplicate curves that appear on a complex 3d model, ive tried SelDup but doesnt get all of the curves.#

Any help? i did also try run a rhinoscript i found by Chris Tietjen but also was unsuccessfull as it still leaves alot of curves?

Im hoping to pipe with t-splines but the additional curves are proving problematic any help?

Thanks in advance

JC

---

<div class="post-metadata">

**Author:** ![John\_Brock](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/john_brock/32/476283_2.png) [@John\_Brock](https://discourse.mcneel.com/u/John_Brock)\
**Post date:** [May 15, 2014, 6:09pm UTC](https://discourse.mcneel.com/t/how-to-delete-duplicate-curves/8418/2 "2014-05-15T18:09:35Z")

</div>

SelDup is about as good as it gets for automatic tools. The command was created because so many DWG/DXF files have extraneous perfect duplicates. If a curve has it’s direction reversed or anything else so it isn’t a perfect duplicate, then SelDup won’t find it.

---

<div class="post-metadata">

**Author:** ![Joe\_Cook](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/joe_cook/32/6185_2.png) [@Joe\_Cook](https://discourse.mcneel.com/u/Joe_Cook)\
**Post date:** [May 15, 2014, 6:11pm UTC](https://discourse.mcneel.com/t/how-to-delete-duplicate-curves/8418/3 "2014-05-15T18:11:08Z")

</div>

Thanks John, would a rhinoscript do the trick if so are there any sample scripts that perform this function?

---

<div class="post-metadata">

**Author:** ![John\_Brock](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/john_brock/32/476283_2.png) [@John\_Brock](https://discourse.mcneel.com/u/John_Brock)\
**Post date:** [May 15, 2014, 6:16pm UTC](https://discourse.mcneel.com/t/how-to-delete-duplicate-curves/8418/4 "2014-05-15T18:16:34Z")

</div>

Sorry, scripting is beyond my pay grade.  
I have no idea how you would go about comparing similar curves within some control parameters.

---

<div class="post-metadata">

**Author:** ![Joe\_Cook](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/joe_cook/32/6185_2.png) [@Joe\_Cook](https://discourse.mcneel.com/u/Joe_Cook)\
**Post date:** [May 15, 2014, 9:49pm UTC](https://discourse.mcneel.com/t/how-to-delete-duplicate-curves/8418/5 "2014-05-15T21:49:35Z")

</div>

HI John

So i used Grasshopper plugin Kangaroo and used the removeDuplicateLines tool and specified a tolerance worked great and very easy.

Thanks

Joe

---

<div class="post-metadata">

**Author:** ![Any829](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/any829/32/137286_2.png) [@Any829](https://discourse.mcneel.com/u/Any829)\
**Post date:** [February 14, 2019, 4:35pm UTC](https://discourse.mcneel.com/t/how-to-delete-duplicate-curves/8418/6 "2019-02-14T16:35:54Z")

</div>

Hi Joe I am new to grasshopper could you be a bit more specific on how to delete duplicate curves on a rhino model? Much appreciated!

---

<div class="post-metadata">

**Author:** ![pascal](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/pascal/32/479395_2.png) [@pascal](https://discourse.mcneel.com/u/pascal)\
**Post date:** [February 14, 2019, 4:38pm UTC](https://discourse.mcneel.com/t/how-to-delete-duplicate-curves/8418/7 "2019-02-14T16:38:19Z")

</div>

Hello - probably best to post a new question on the GH forum here:

[https://discourse.mcneel.com/c/grasshopper](https://discourse.mcneel.com/c/grasshopper)

-Pascal