I have multisub material. With macrorecorder enabled I can see how max creates texMapList and texMapIDList when I open EditUVWs window: $.modifiers[#Unwrap_UVW].texMapList.count = 17 $.modifiers[#Unwrap_UVW].texMapIDList.count = 17 $.modifiers[#Unwrap_UVW].texMapList[1] = Checker () $.modifiers[#Unwrap_UVW].texMapIDList[1]…