Use model.component(<ctag>).geom(<tag>).create(<ftag>,"MeshControlFaces") to define mesh control faces in 3D.
Use model.component(<ctag>).geom(<tag>).feature(<ftag>).selection("input") to select the faces to include. The default selection is empty.
Use includeadj to specify if the feature also includes the ignorable edges and vertices on the boundary of each resulting composite domain.