function m = GArender(a)% GArender(a): Query/set the Geometric Algebra rendering mode%  With no arguments, this routine returns the rendering mode.%  With one argument, this routine will set the rendering mode to%  that argument%%See also gable.% GABLE, Copyright (c) 1999, University of Amsterdam% Copying, use and development for non-commercial purposes permitted.%          All rights for commercial use reserved; for more information%          contact Leo Dorst (leo@wins.uva.nl).%%          This software is unsupported.persistent modeif nargin==1  mode = a;elseif nargin==0 & length(mode)==0  mode = 'zbuffer';endm = mode;