I just made a scene with a city made of mostly identical skyscrapers. I did that by copying and pasting. Then I joined all of them with Ctrl+J, but now I can't undo the join and I have got around 300+ glass and wall materials in one obj. My question is how do I merge them into 1 glass and 1 wall material so I can change all windows and all walls at once? Selecting them all is not an option. I have 1000+ windows in my scene and now in one obj.
Short version: I mucked up and now I need to clean up 300+ materials. How can I do that? Maybe an add-on?
edit: I tried deleting all but the first glass and wall. i had one skyscraper left that had colors.
edit2: my materials are in alternating order. like glass, wall, glass, wall, glass, wall.... i think you get the idea.