With this function you can get the unique index ID of the camera assigned to a specific view in a room other than the current one. You give the room to use, the view port to use (from 0 to 7) and the function will return a camera index.
Argument Description rm The index of the room to get the view camera of vind The index of the view port to get the camera of
Real (Camera Index)
var cam = room_get_camera(rm_Game, 0);
if cam != global.MainCam
room_set_camera(rm_Game, 0, global.MainCam);
The above code assigns a camera in a newly created room to view port .