Find slab or roof from ceiling

Geometry
1

Hi, I’m trying to find where the ceiling panels are hanging, slab or roof.
How do I find elements which doesn’t have any intersects? I want to get some fresh ideas.
image

2

Try the raybounce method.
You can find the nodes in the DataShapes Package.

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3

Hi, @Marcel_Rijsmus
Thank you for your suggestion.
image
I tried those nodes from the DS and bimorph packages but couldn’t find any elements that I wanted.
I put midpoints of ceilings(boundingbox) into Points(origin) and other inputs folloing the link that you posted and it just found the ceilings. Did I put something wrong inputs?

4

Thanks, I found the way through the Raybounce node.

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