In UVMapper, choose Edit->Select->by Material and select one (or more) of your materials. Then press '' to hide the selection and press enter (you can find more of these keys under Help->Hot keys.) Then export the texture map being sure to select 'exclude hidden facets' on the export options dialog. After you have your first map, press '' again to swap the two pages and repeat. If you have any questions, let me know. Good luck, Steve