Hi!
I am trying to do a tunnel in Revit, so I want to cut some topography. Since Revit can not cut topography with a building I remind to use Dynamo.
In Dynamo I want to select the topography, thicken it so it becomes a solid and then use the “difference” node to subtract my building.
Is it possible? I can not thicken the topography… 
Thanks in advance!!