I am modelling a simple arena(like a football, basketball arena) for a fighting game I am making, in 3d studio max. I am trying to model the inside. Is there anyway I can flip the normals of the shapes(using a half sphere for the dome, and a cyclinder for the outside) to allow lighting in the inside? I will be exporting to X file format for use in my game.

yeah first convert it to mesh editable and the use the face/polygon selection option to flip/turn normals