# Geometry.Intersect

**URL:** <https://forum.dynamobim.com/t/geometry-intersect/81547>\
**Category:** Revit\
**Tags:** geometry, dynamo\
**Created:** [September 28, 2022, 5:24am UTC](https://forum.dynamobim.com/t/geometry-intersect/81547 "2022-09-28T05:24:41Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![seba11](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@seba11](https://forum.dynamobim.com/u/seba11)\
**Post date:** [September 28, 2022, 5:24am UTC](https://forum.dynamobim.com/t/geometry-intersect/81547/1 "2022-09-28T05:24:41Z")

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Hi,

why i have empty list in \*block **geometry.intersect**???

 ![Problem](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/2/b/2b9cc88b7406e6d0fe4ebe9c95abe9718f8f1cb6.png)  
 ![problem2](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/6/9/692a7346416216b063d51b49e04cd6f27b8e33f6.png)

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<div class="post-metadata">

**Author:** ![leonard.moelders](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/leonard.moelders/32/108216_2.png) [@leonard.moelders](https://forum.dynamobim.com/u/leonard.moelders)\
**Post date:** [September 28, 2022, 5:47am UTC](https://forum.dynamobim.com/t/geometry-intersect/81547/2 "2022-09-28T05:47:36Z")

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[https://dictionary.dynamobim.com/#/Geometry/Geometry/Action/Intersect](https://dictionary.dynamobim.com/#/Geometry/Geometry/Action/Intersect)  
[https://dictionary.dynamobim.com/#/Geometry/Geometry/Action/IntersectAll](https://dictionary.dynamobim.com/#/Geometry/Geometry/Action/IntersectAll)

Geometry.Intersect compares TWO geometries. Your lists have different lengths, so the node can not match one geometry to another. Better use Geometry.IntersectAll and flatten one of the list and maybe adjust the used levels.

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<div class="post-metadata">

**Author:** ![paris](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/paris/32/144289_2.png) [@paris](https://forum.dynamobim.com/u/paris)\
**Post date:** [September 28, 2022, 6:44am UTC](https://forum.dynamobim.com/t/geometry-intersect/81547/3 "2022-09-28T06:44:38Z")

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Hi @seba11 maybe try set cross product into intersect node. Cheers

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<div class="post-metadata">

**Author:** ![seba11](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@seba11](https://forum.dynamobim.com/u/seba11)\
**Post date:** [September 28, 2022, 8:10am UTC](https://forum.dynamobim.com/t/geometry-intersect/81547/4 "2022-09-28T08:10:46Z")

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You’re right that it should be 1 to 1, but even if I apply the second block, it doesn’t work either. Also gets an empty list.

And I want to find places where all cable routes intersect with all walls. Can I do something with a dynamo that will treat all these walls as one?

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<div class="post-metadata">

**Author:** ![gilberto.arechigaiba](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/gilberto.arechigaiba/32/204980_2.png) [@gilberto.arechigaiba](https://forum.dynamobim.com/u/gilberto.arechigaiba)\
**Post date:** [September 28, 2022, 11:04am UTC](https://forum.dynamobim.com/t/geometry-intersect/81547/5 "2022-09-28T11:04:08Z")

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Hola Amigo @seba11, I hope this gives you some ideas

 ![Geometry Intersect](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/a/1/a17166f2731652ff1caa3a2f214b520e69bc8c05.jpeg)