Navier Stokes problem with arbitrary inlet/ outlet plane

The example http://sfepy.org/doc-devel/examples/navier_stokes/navier_stokes.html clearly illustrated a NS problem with inlet velocity normal to y axis.

Is it possible to set the inlet with arbitrary plane that is not normal to any axis? e.g. inlet normal velocity = (u1, u2, u3)

I see that in this example the inlet and outlet boundaries are defined by the cinc functions:

cinc_name = 'cinc_' + op.splitext(op.basename(filename_mesh))[0]cinc = getattr(utils, cinc_name) functions = { 'cinc0' : (lambda coors, domain=None: cinc(coors, 0),), 'cinc1' : (lambda coors, domain=None: cinc(coors, 1),),}

how would this utility work with my arbitrary inlet/outlet boundaries?