Ok, Im Thinking about the game like doom 3d, walkaround first person, With the Z axis its possible to make things 3d but i dont quite understand how when you move the backround changes
Any "3D" feature is not supported by AGS internally, you will need to work round this by scripting the system yourself or by using modules and (http://www.adventuregamestudio.co.uk/yabb/index.php?topic=29419.0)/or plugins (http://www.adventuregamestudio.co.uk/yabb/index.php?topic=23400.0).
HOWEVER, as AGS was not originally designed for these kinds of stuff (at least not for the time being, also, those plugins, etc. mentioned have not been updated for a while, so they may not even be compatible with more recent versions of AGS), if you really want to develop a game with intensive 3D elements, AGS may not be a suitable tool, you may try to search for alternatives.