Maxscript: This demonstrates adding a uvwMap modifier and setting its transform

Set UVW_Map Gizmo | .ms

-- delete objects
-- for y = -10 to 10 do
-- (
-- 	for x = -10 to 10 do
-- 	(
-- 		b = box width:5 height:1 length:5
-- 		b.pos = [x*5,y*5,0]
-- 	)
-- )

mapped fn setUVWModifier obj =
(
	--addModifier obj (UvwMap length:200 width:200)
	for i = (obj.modifiers.count) to 1 by -1 do
	(
		if isKindOf (local mody = obj.modifiers[i]) UvwMap do
		(
			mody[1].transform = inverse obj.transform
		)
	)
)

-- odd modifier
nodes = getCurrentSelection()
for n in nodes do addModifier n (UvwMap length:200 width:200)
setUVWModifier nodes