you need to modify the model itself, ( modifying a bone or something) then use SetUnitLookAt(). there's a tutorial or resource for it on WC3C, but i think its currently down. if youre looking to use the face unit instantly eg for dummy unit, theres a made model already designed for that (which is somewhere in this &wc3c.
iam think iam need a model like a soldiers v3.9 iam mean the unit is facing instanly flow at air turn z axis like 2D...and here no got pro making model user?
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.