def FakeRectAO(gc, clr, strength, dist, grad, su = U, sv = V):
	# gc - True if you want a Gamma Correcting version
	# clr - the color of the surface
	# strength - the maximum darkening at the edge
	# dist - the distance (in UV coordinates) where the darkening stops
	# grad - darkening gradient applied bottom of v coordinate
	# su - scaled U coordinate
	# sv - scaled V coordinate
	# If your object is significantly non-square adjust su and sv.
	# For example if your rectangle is 2x wide, pass su = 2 * U.
	# Ceilings and floors should not use grad.

	u = 1 - Clamp(1.0/dist * Min(su, 1-su))
	v = 1 - Clamp(1.0/dist * Min(sv, 1-sv))
	d = Blend(u, 1, v)
	s = 1 - strength
	ed = Blend(1, s, Bias(d, .2))
	gd = Blend((WHITE-grad) * ed, ed, V)
	dv = gd
	if not gc:
		return Surface(clr, dv, 1, 0)
	gamma = Add(2.2).labelled("Gamma")
	clr = clr ** gamma
	diff = Diffuse(clr, dv)
	output = (diff) ** (1/gamma)
	return Surface(0, 0, 0, 0, Alternate_Diffuse = output)


WallClr = IColor(230, 210, 190)
CeilingClr = WHITE

outputs += [
	"Wall", FakeRectAO(False, WallClr, .1, .15, .4),
	"Ceiling", FakeRectAO(False, CeilingClr, .07, .2, 0),
	"WallGC", FakeRectAO(True, WallClr, .2, .15, .4),
	"CeilingGC", FakeRectAO(True, CeilingClr, .14, .2, 0),
]