selected face assign material only

(
	max modify mode
	selObsArr = selection as array
	for o in selObsArr where isKindOf o Editable_Poly or isKindOf o Editable_Mesh do
	(
		select o
		subobjectlevel = 4
		topFaces = #{}
		minFaces = #{}

		gfc = if isKindOf o Editable_Poly then polyop.getfaceCenter else meshop.getfaceCenter
		for f = 1 to o.numfaces do
		(
			if (gfc o f).z == o.max.z do append topFaces f

			if (gfc o f).z == o.min.z do append minFaces f
		)
-- 		o.selectedfaces = topFaces
		polyop.setFaceSelection o topFaces

		o.material = meditMaterials[2]

	)
)

But this is not the proper solution. ;)

that is good ~
really thank you always