# Element Geometry from filtered list

**URL:** <https://forum.dynamobim.com/t/element-geometry-from-filtered-list/7161>\
**Category:** Revit\
**Created:** [October 31, 2016, 4:11am UTC](https://forum.dynamobim.com/t/element-geometry-from-filtered-list/7161 "2016-10-31T04:11:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![clintonmaulder](https://avatars.discourse-cdn.com/v4/letter/c/e8c25b/32.png) [@clintonmaulder](https://forum.dynamobim.com/u/clintonmaulder)\
**Post date:** [October 31, 2016, 4:11am UTC](https://forum.dynamobim.com/t/element-geometry-from-filtered-list/7161/1 "2016-10-31T04:11:02Z")

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I’m trying to come up with a variation to placing a family at an element centroid.  
The variation is that I want to filter my selection, in this case by wall element name, but once I do that I seem to lose the ability to convert to geometry and then find the centroid.  
Any assistance appreciated.  
Regards  
Clinton.

 ![](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/2X/7/74fc9acf0be9462cbe1bbdfc6c1f7dab9de27ec2.png)

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**Author:** ![Andreas\_Dieckmann](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/andreas_dieckmann/32/365_2.png) [@Andreas\_Dieckmann](https://forum.dynamobim.com/u/Andreas_Dieckmann)\
**Post date:** [October 31, 2016, 7:08am UTC](https://forum.dynamobim.com/t/element-geometry-from-filtered-list/7161/2 "2016-10-31T07:08:38Z")

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You are feeding a list of names (strings) to the Element.Geometry node when you want it to process elements (walls). You should use the boolmask filter instead. There’s lots of examples for that on the forum.

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<div class="post-metadata">

**Author:** ![clintonmaulder](https://avatars.discourse-cdn.com/v4/letter/c/e8c25b/32.png) [@clintonmaulder](https://forum.dynamobim.com/u/clintonmaulder)\
**Post date:** [October 31, 2016, 6:26pm UTC](https://forum.dynamobim.com/t/element-geometry-from-filtered-list/7161/3 "2016-10-31T18:26:52Z")

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Hi Andreas,

Thanks for the response, yes I’d tried using a Boolmask  
filter in another attempt, but still had an element.name node feeding into the  
element.geometry node, once I eliminated this I get the result I want.

Thanks again.

 ![](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/2X/7/7bfbeb99741aa481347a41f59d2cb1eeebf4f877.png)