Mac OS X specific variables

MAYA_MAC_SET_UMASK
This environment variable lets you set file sharing permissions. The following example sets the permissions of any file created by Maya to be readable/writable by any user:
MAYA_MAC_SET_UMASK = 0
QT_MAC_WANTS_BEST_RESOLUTION_OPENGL_SURFACE
Set the environment variable to 0 to disable Hi-DPI support implemented to address pixilation on 4K monitors that lets you render at native resolution on high DPI screens:
QT_MAC_WANTS_BEST_RESOLUTION_OPENGL_SURFACE = 0

Setting this variable to 0 affects the Viewport, Graph Editor, Paint Effects and other 3D view/GL-based widgets.