# Trim offset curves

**URL:** <https://forum.dynamobim.com/t/trim-offset-curves/16561>\
**Category:** Revit\
**Created:** [November 16, 2017, 2:26pm UTC](https://forum.dynamobim.com/t/trim-offset-curves/16561 "2017-11-16T14:26:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Wouter](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/wouter/32/36342_2.png) [@Wouter](https://forum.dynamobim.com/u/Wouter)\
**Post date:** [November 16, 2017, 2:26pm UTC](https://forum.dynamobim.com/t/trim-offset-curves/16561/1 "2017-11-16T14:26:24Z")

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Continuing the discussion from [Fire Rating Lines with Offset](https://forum.dynamobim.com/t/fire-rating-lines-with-offset/16446):

Good day fellow Dynamo users,

I’m trying to trim my offset curves:

 ![offset curves d](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/3/6/360dd6070dff8bea2c2aae56f28c5567e657f396.PNG) ![offset curves r](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/2/c/2c763bc575b4060d207a3967624a92b99cb14a4f.PNG)

I tried the Geometry.Trim on various ways:

 ![trim offset curves d](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/3/8/382a4b654068dd48a472b8d93617ced6d6a36fe5.PNG) ![trim offset curves r](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/b/9/b9ba2b8b07684d3db533437f0db4a3721ee919f8.PNG)

It would be of great help if someone could help me in the right direction.

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<div class="post-metadata">

**Author:** ![r.lietz](https://avatars.discourse-cdn.com/v4/letter/r/8e8cbc/32.png) [@r.lietz](https://forum.dynamobim.com/u/r.lietz)\
**Post date:** [March 13, 2019, 10:12am UTC](https://forum.dynamobim.com/t/trim-offset-curves/16561/2 "2019-03-13T10:12:26Z")

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Hello Wouter,

I hope you’ve been able to solve your problem, but it if you haven’t, it’s sad to see such a lonely post on it’s own, especially when you’re looking on the forum to solve a similar problem.

This one has been one of the most frustrating problems I’ve had in trying to solve a problem with dynamo, and there have been a few. But after a few more frustrating days I’ve managed to come up with a solution that suits my problem and may assist you. I was looking to offset a closed detail line into the internal space. ie offset walls to come up with a ceiling space etc, etc. first the Curve.Offset didn’t work very well, then if the angle was obtuse the offset lines didn’t meet or cross, and I couldn’t get Geometry.Trim to work.

So I re-looked at the problem and maybe it was better to use intersecting points, so I’ve come up with the following, with grateful assistance from Curve.IntersectAll from BimorphNodes, W Curve.Offset+ from Springs and Curves.EndPoints from Lunchbox to make a meal of it.  
(I’m using Dynamo 2.0206833)  
 ![OFFSET_TRIM](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex022/uploads/dynamobim/original/3X/f/9/f91df045b7d32b849dc5ef026a508e62e9be4fa4.png)  
[OFFSET\_TRIM.dyn](https://forum.dynamobim.com/uploads/short-url/lXvwVbXQDj4aNLNszB8KIzbaEG7.dyn) (38.9 KB)