• Prolog is an option for graphics functions which gives a list of graphics primitives to be rendered before the main part of the graphics is rendered.
• Graphics primitives specified by Prolog are rendered after axes, boxes and frames are rendered.
• In three-dimensional graphics, two-dimensional graphics primitives can be specified by the Prolog option. The graphics primitives are rendered in a 0,1 coordinate system.
• New in Version 2.