Inverting a GeometryArray

I've recently been playing around with the Java3D libraries to try and render a little game. I've figured everything out pretty much and I've gotten to the point where I have a GeometryArray for each room of the level but the problem is, when I play, the textures appear on the outside of the room, not on the interior walls, cieling and floor. Anybody lend any help?

[377 byte] By [Vassimia] at [2007-11-27 7:46:52]