# Solids union

**URL:** <https://forum.dynamobim.com/t/solids-union/105153>\
**Category:** Civil 3D\
**Created:** [October 15, 2024, 8:02am UTC](https://forum.dynamobim.com/t/solids-union/105153 "2024-10-15T08:02:16Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![avetik.kagramanian](https://avatars.discourse-cdn.com/v4/letter/a/ed655f/32.png) [@avetik.kagramanian](https://forum.dynamobim.com/u/avetik.kagramanian)\
**Post date:** [October 15, 2024, 8:02am UTC](https://forum.dynamobim.com/t/solids-union/105153/1 "2024-10-15T08:02:16Z")

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Hello  
I have a list of solids. The list contains of sublists. And each sublist contains of several solids. The amount of solids in sublists varies. I need to union solids in each sublists.

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/9/4/949ac6e9696791f93b306df0d996a1996946933c.jpeg)

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**Author:** ![sovitek](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/sovitek/32/116237_2.png) [@sovitek](https://forum.dynamobim.com/u/sovitek)\
**Post date:** [October 15, 2024, 8:05am UTC](https://forum.dynamobim.com/t/solids-union/105153/2 "2024-10-15T08:05:24Z")

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Hi @avetik.kagramanian try solid union with L2 in list level

 ![Skærmbillede 2024-10-15 100756](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/6/d/6d9cf29537ada18747b2e87b8cbaf99d71e954fc.png)

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<div class="post-metadata">

**Author:** ![avetik.kagramanian](https://avatars.discourse-cdn.com/v4/letter/a/ed655f/32.png) [@avetik.kagramanian](https://forum.dynamobim.com/u/avetik.kagramanian)\
**Post date:** [October 15, 2024, 8:11am UTC](https://forum.dynamobim.com/t/solids-union/105153/3 "2024-10-15T08:11:08Z")

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that is exactly what I need, Thank you

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<div class="post-metadata">

**Author:** ![eno.lints](https://avatars.discourse-cdn.com/v4/letter/e/8491ac/32.png) [@eno.lints](https://forum.dynamobim.com/u/eno.lints)\
**Post date:** [November 7, 2024, 10:12pm UTC](https://forum.dynamobim.com/t/solids-union/105153/4 "2024-11-07T22:12:00Z")

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Hi, I got a problem with the node Solid.ByUnion. Manually the union works, but the Dynamo node doesn’t work. I have 2 separate solids in my modelspace, if I ran the script it shows that two solids are created into one, but in modelspace nothing changes.

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/2/a/2af759c14a14c6fe36e715c7b10e22e8af093ae7.jpeg)

What am I doing wrong?

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**Author:** ![jacob.small](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/jacob.small/32/161030_2.png) [@jacob.small](https://forum.dynamobim.com/u/jacob.small)\
**Post date:** [November 7, 2024, 10:49pm UTC](https://forum.dynamobim.com/t/solids-union/105153/5 "2024-11-07T22:49:28Z")

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The solid by union node is from the Dynamo geometry library. This is to create stuff in Dynamo, not in your dwg.

To push to a DWG you’ll need to use a Object.ByGeometry node, which is in the AutoCAD section of the library.

Note the original CAD solids will still persist in the DWG, so you might want to use an Object.Delete as well.