Game Level Builder 3.0 (GLB3) - is a toolset for making convex e.g. (bsp ruled) based levels for games using discreet's 3ds maxâ„¢ and gmaxâ„¢. The main difference between GLB and all of the standard convex based level editors is that GLB's main system for modelling is not based from boxes which are hollowed or carved (CSG subtracted).