Geometry.Intersectall got the empty list

Revit
1

Good morning all,

I try to use Geometry.Intersectall to filter the mesh, cause I only want to get the mesh on the analysis surface (red boundary). But I don’t know where I did wrong steps and I got the empty list.

Anyone could help me fix this?

Many thanks

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微信截图_20190807085840.png909×543 50 KB

2

Do your geometry cross each other?
if there is more than one surface, switch Lacing in Cross Product

3

Yes, I think so. The surface and the mesh, both of them are in the same level.
I tried to switch lacing in Cross Product. It looks working, but I’m wondering how I can remove the rest mesh I don’t want?

image
image.png953×522 80.1 KB

4

mask the precious knots to see the final result.
to do it: right button on the node- Preview

5

It works!!!
Thank you very much!
I feel like I have no idea about Dynamo. HAHA…

6

it will come