The Ogl 'Chill' modules are a software layer above the original Ogl modules which they use as an interface to the Open GL (Graphic Language) dynamic link libraries (DLLs) opengl32.dll, glu32.dll. It gives (relatively) easy access to some graphic capabilities implemented in OpenGL in a ready-to-use form. Explicitly it implements an extension of the Plotter object defined in the Lib Subsystem.
Examples are provided, as are complete Menu items that will convert simple two-dimensional Map plots into full three-dimensional models supporting arbitrary rotations, complex lighting effects, and hidden surface removal.