# Filter coinciding geometry

**URL:** <https://forum.dynamobim.com/t/filter-coinciding-geometry/3000>\
**Category:** Packages\
**Created:** [January 22, 2016, 4:37am UTC](https://forum.dynamobim.com/t/filter-coinciding-geometry/3000 "2016-01-22T04:37:00Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Julian\_Paskalev](https://avatars.discourse-cdn.com/v4/letter/j/f4b2a3/32.png) [@Julian\_Paskalev](https://forum.dynamobim.com/u/Julian_Paskalev)\
**Post date:** [January 22, 2016, 4:37am UTC](https://forum.dynamobim.com/t/filter-coinciding-geometry/3000/1 "2016-01-22T04:37:00Z")

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Hello.

I have recently began to use Dynamo and I think it’s great. I am working on a specific task and right now I can use a little help.

I have a list of revit part elements. Some of them are almost duplicates - their geometry coincides almost on 100%, their are only some minor differences that make them unique. I want to filter out from that list all the elements with intersecting geometry that have more than 98% coincidence with other elements from that list. How can I do that?

Greets

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**Author:** ![Julian\_Paskalev](https://avatars.discourse-cdn.com/v4/letter/j/f4b2a3/32.png) [@Julian\_Paskalev](https://forum.dynamobim.com/u/Julian_Paskalev)\
**Post date:** [January 22, 2016, 6:57am UTC](https://forum.dynamobim.com/t/filter-coinciding-geometry/3000/2 "2016-01-22T06:57:22Z")

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I want to reformulate my question:

Is it possible to identify all members within a list that are approximately equal to other members of the same list?

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**Author:** ![Vikram\_Subbaiah](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/vikram_subbaiah/32/50797_2.png) [@Vikram\_Subbaiah](https://forum.dynamobim.com/u/Vikram_Subbaiah)\
**Post date:** [January 22, 2016, 7:48am UTC](https://forum.dynamobim.com/t/filter-coinciding-geometry/3000/3 "2016-01-22T07:48:05Z")

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One way to begin would be to first outline the parameters that would help determine their similarity

Volume?, Area?, Length?, Height?, Volume and Area?, Volume, Area and Height? …

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**Author:** ![Julian\_Paskalev](https://avatars.discourse-cdn.com/v4/letter/j/f4b2a3/32.png) [@Julian\_Paskalev](https://forum.dynamobim.com/u/Julian_Paskalev)\
**Post date:** [January 22, 2016, 8:11am UTC](https://forum.dynamobim.com/t/filter-coinciding-geometry/3000/4 "2016-01-22T08:11:27Z")

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I think the parameters should be volume and bounding box points.

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**Author:** ![Vikram\_Subbaiah](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/vikram_subbaiah/32/50797_2.png) [@Vikram\_Subbaiah](https://forum.dynamobim.com/u/Vikram_Subbaiah)\
**Post date:** [January 22, 2016, 10:44pm UTC](https://forum.dynamobim.com/t/filter-coinciding-geometry/3000/5 "2016-01-22T22:44:56Z")

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Bounding box (as it works today) may not be a good idea as the bounding box of the same geometry with different orientations will be different.

A simple example …

 ![20160123-1](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/2X/b/b0821a9ca899ea28e21031b3077a947ffb57ddbc.png)

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