This small scripts applies a Material modifier to all selected nodes and adds a random value to all of them.
--Randomize the material ID on selection... NumberOfMultiMaterials = 8 for item in (selection as array) do ( rndVal = random 1 NumberOfMultiMaterials --This clears already existing Material modifiers ExistMod = for m in item.modifiers where m.name == "MyRandMat" collect m for m in ExistMod do ( deleteModifier item m) Mat = materialModifier name:"MyRandMat" Mat.materialID = rndVal AddModifier item Mat ) --end script