Messy meshtrim

Hey there

I’m wondering here that do i have problems about understanding the basics of mesh or is it just about weather, that mesh is very tricky thing to work with.
Anyway, i have a mesh from pointcloud. And second mesh from curves.


And a road, what should sit into landscape. Road was made from curves, witch i projected on mesh and made surface, from which made mesh. Tried to trim also with intersection curve. No success.

I have no idea how to match those two meshes and why mesh doesnt allow to trim. It’s not just about that road, whatever i try…
So i’m quite confused, is there something basic that i dont know or… do you have some suggestions?

Thank you, thank you, thank you! :sunny:

Can you post the mesh and the curves for the road? You might not have a complete intersection between them.