at each vert struct if it is selected or not. Technically it could be possible to reconstruct this info from the undo mesh 'stack', but that would be a slow and weird method, since it would depend on how many undo steps the user chose to have in his/her Blender. Maybe vertex groups can help you, though. Joe added support for them in NMesh. -- Willian, wgermano at ig.com.br