Import from revit to unity with materials,How import FBX files with materials

hello, i’ve tried to import a fbx file from revit and mapped later with 3ds max, but when I import to unity, the materials dissapears, i see the scene with grey materials.
I’ve tried a lot of things I read in the forum but I dont get the solution.

what is the workflow to import from revit to unity with materials?
thanks a lot.

I’ve used this online tool with success many times - http://materialconverter.com. It’ll convert your autodesk materials to standard ones you can use in Unity or Unreal. You upload your Autodesk exported FBX, it converts it for you, then you download it afterwards.