When using the Octave for Windows installer, the user has the option to select
between "System OpenGL" and "Software OpenGL" renderers. This option selects
whether software rendering is used for the OpenGL graphics toolkits
("qt" and "fltk"). Software rendering can be used to avoid
rendering and printing issues due to imperfect OpenGL driver implementations
for diverse graphic cards from different vendors (notably integrated Intel
graphics). As a down-side, software rendering might be considerably slower
than hardware accelerated rendering (and it might not work correctly on 32-bit
platforms or WoW64). To permanently switch between hardware accelerated
rendering with your graphics card drivers and software rendering, use the
"OpenGL Switcher" application from the Start menu while Octave is closed.
Alternatively, rename the following file while Octave is closed:
octave-home\bin\opengl32.dll
where octave-home is the directory returned by
OCTAVE_HOME, i.e., the directory in which
Octave is installed (the default is
C:\Program Files\GNU Octave\Octave\Octave-version\mingw64).
Change the file extension to .bak for hardware rendering or to
.dll for software rendering.