I'm tring to palce a FireAlarmDevices(NewFamilyInstance) host on Ceiling in Linked Model
I use "CreateLinkReference" Method,because The remarks in the help file state:
"The reference that is returned can be used to create a family instance on a face in an RVT link."
and I use NewFamilyInstance(Reference, XYZ, XYZ, FamilySymbol) to create a family instance.
but i found this error "Reference direction is parallel to face normal at insertion point" .
to create a family instance.
notice if this ceiling at the same project no error found so i think that the problem is not the direction of the family instance
I would be very grateful for an example showing how I can attach a face hosted family to a Revit Linked file (a ceiling grid in particular).
Thanks a lot.