Describes a set of functions to enable computer graphics to generated three dimensional pictures on output devices. Includes functions for storage on and retrieval from an external graphics file. Includes scope and field of application, references, definitions, the Graphical Kernel System for Three dimensions, GKS-3D functions, GKS-3D data structures, functions lists, error list, interfaces, allowable differences in GKS-3D implementations, metafile structure, sample programs, GKS-3D functions summary and colour models. It also provides 20 figures.