Why does the material apply to all?

This is my second time using Twinmotion for rendering. The problem that I have, is that when I import my model into Twinmotion from Rhino 7, the building is read as one object making the material apply to the entirety of the building and not just the layers that I want it to be. I have my layers split up in Rhino. Is there a certain way I need to export this?

Hi ,

When you import your model, in the import settings you will want to select the Keep Hierarchy collapse option. This will preserve the layers as they were in Rhino. If you use any of the other Collapse options, then you model will combined, either by material or into a single object.

Best,

Raghib