retallion

Hi! I´m new to GR map modelling but not to 3DS MAX. I have done a 2 room map with textures joined by a portal and it works fine in IGOR. When i´m playing the map in GR i can´t see thru the doorway until i get closer to it. should I hide the portal in 3dsmax? in some positions the wall around the door seems to get normals flipped. any suggestions what it can depend on? /retallion