Revit family (2021) + FBX + DXF + DWG + 3dMAX are also available. materials are on the same file. clean file no polygons show in hidden line view. adjustable materials.model exported from 3DSMAX and imported to revit via autocadmodel is in RFA format workplane based and face basedin the file with the materials you will have to modifay the path material > Settings > Rendering opttion > select the files to modifay the materials go to Manage > Object styles > imported objects > look after the family name