i tried color change at first and then tried texture change texture(by a white sample pic), for sure i try changing both sides to check it , i didnt get what u mean by 'in 3d view' ? i make changes after clicking the object on upper side of software(2d mode screen) any settings can be maked by right clickin on 3d view screen?? i dont see any settings about walls or objects, just sum light and transparecy settings in modify selection!!