Sets the depth read mode when drawing this object to the screen. The object must pass the the depth test in order to be visible. The available options are 0=never pass, 1=less than, 2=equal, 3=less than or equal, 4=greater than, 5=not equal, 6=greater than or equal, 7=always pass. By default all objects use the mode 1 (less than) which means they must be closer than any objects already drawn to be visible.
SetObjectDepthReadMode( objID, mode )