It looks like this method won't work for my game design. I thought the textures where placed not duplicated to make it work.
If I made this lamp by straight applying and positioning materials on faces the export 3ds would only be four materials (four pngs to put in my game assets folder). Using this way, well.. the screenshot. I can't have hundreds of the same texture.
Is there a way around this? Have texture alignment coordinates instead of multiple textures?