I am getting into 3D modeling for scale models for Architecture. I am a 3D artist traditionally modeling in polygon meshes with little experience with Nurbs. I read that some cnc software accepts stl meshes. How common is this? I worked on a job recently where they could not use the mesh for CNC. I did not get a reason. I understand the meshes need to high poly counts to remove any unwanted faceting without any smoothing. Do I need to try to learn nurbs modeling or is my client not using a good CNC company?

The work I am doing is usually high concepts of organic shaped buildings. Very sculptural.

Thanks!