From Realflow to Grasshopper

Hi at all,

I need some help to get my goal.

I working at a architectural project, I want to simulate some skyscrapers and the terrain arround with realflow. After that I have a very dynamic and smooth mesh.
That mesh should be the basis for some parametric work, like the structure of the skyscrapers and terrain...

But with a mesh it is hard to work in grasshopper, how would you guys handle this?

I tried to convert the mesh in to a nurb (MeshtoNurb) and load it as a brep in to grasshopper, but it crashed, there are to many polysurfaces...

Do you have an advice? Maybe by using a other software like 3ds ?...

Thank you.