I've got this problem where I use the following GL call glu.gluPerspective(45.0f, h, 1.0, 600.0) to set my perspective.  But 1x1x1 cubes look like pizza boxes instead of cubes! (well, actually their height seem to be more or less half their width/depth)

So is there anything I can do to correct this?

(edited because of wrong information)