I spent several hours trying to split that mesh and already found several topics about splitting meshes in Rhino but I couldn’t find any solution. Unfortunately, my mesh is pretty big and every try takes quite a bit of time, so I decided to ask if any of you have any idea of how can I force mesh split to work in my case? Extrusion is just a cutter which should leave me with a cutout of a road from the mesh - instead of, it leaves me with some strange results.
I tried both Rhino 6 and WIP version.