Modify existing materials

Thank you Insanto, that makes a lot of sense and the code comments are appreciated as well!
And interesting there is no "purple" in MAXscript : but I worked out it was local col = color X Y Z for individual colours.

i wrote it in a way so you can expand on it quite easily, you just gotta know the class of the material and the settings

if you wanna find out the class you use:
classOf meditMaterials[1] --returns class of the materialEditor's first slot

to get the propertyNames and types you use:
showproperties meditMaterials[1]

-add the class to the classFilterFN function
-add a new case for the added materialClass with it's properties you wish to change

have phun

cool, Insanto
could it be possible to have a line for Vray material too ? thanx

i suggest:

(	
	
	
	local mats = #()																												-- create the empty array

	fn classFilterFN mat = classOf mat == Arch___Design__mi OR classOf mat == standardMaterial	-- function to filter all materialClasses that are to be modified

	for obj in geometry do																										--loop through the geometry
	(
		local mat = obj.material																								-- assign the current object's material to a variable cuz im a lazy typer
		
		if mat != undefined do																									-- check if the object has a material at all
		(
			if classOf mat != multisubmaterial then																		-- check if the material is a multiSub-object-material
			(
				if classFilterFN mat do																							-- check if the material's class  is in the ones to be modified
				(
					mats[mats.count+1] = mat																								-- append the material to the 'mats' array
				)
			)
			else																														-- if it is a multiSub-object-material..
			(
				for m in mat.materials do																						--loop through the multiSub-object-material's materials
				(
					if classFilterFN mat do 																						-- check if the current material's class is in the ones to be modified
					(
						mats[mats.count+1] = mat																							-- append the material to the 'mats' array
					)
				)
			)
		)
	)
	
	
	for mat in mats do																											-- loop through the materials collected previously
	(
		local col = green
		
		case (classOf mat) of																									-- handle each material class diffrently
		(
			Standardmaterial : ( mat.diffuse = col )
			
			Arch___Design__mi : ( mat.diff_color = col )
		)
	)
	
	
)

:P